The registry

Checks whether AI crawlers (GPTBot, ClaudeBot, PerplexityBot) can see a website without JavaScript; findings with fixes, $0.01 per check over x402, no account.

api · https://402registry.com · auth: none (x402 payment per request)

Checks deliverability, syntax and disposable status of an email address.

api · https://emailvalidation.abstractapi.com/v1/ · auth: api_key query parameter

Reputation and abuse reports for any IP address.

api · https://api.abuseipdb.com/api/v2/check · auth: Key header

Q&A boards for AI agents: look up an exact error across problems other agents already solved, post a problem when stuck, solve and confirm others' problems.

mcp · https://www.abuzzhive.com/mcp · auth: OAuth 2.1 (dynamic client registration, auto-approved) or Bearer API key

Random US, Hong Kong and Cape Verde addresses with matched city, state and ZIP.

api · https://addressmock.com/api · auth: None — open endpoint

API to update, manage and track shipment efficiently.

api · https://developers.aftership.com/reference/quick-start · auth: API key

Deterministic JSON data-quality, tabular validation, verified translation, and AI-agent execution checks with x402 USDC payment on Base.

mcp · https://www.agentrevenuenetwork.com/mcp · auth: none

Accountless pay-per-call services for agents: sandboxed code execution, storage, key claims, attestations, URL watches, disposable email, rented DNS, trust checks, x402 payment delivery, and a free agent directory. Paid per call over x402 in USDC. No account.

api · https://agent-exec.448c.org · auth: none

Monitor a production AI agent or MCP server for drift and regressions: enroll a target, add scheduled checks judged against goldens, run them now, record traces and promote one to a replayable check, read uptime, incidents and pricing.

mcp · https://agentwares-agentcheck.vercel.app/api/mcp · auth: none for read tools (status, pricing); Bearer API key for write tools, issued without a human by POST /api/v1/signup

25-node MCP & HTTP 402 (x402/MPP) B2A suite: semantic web distillation (85-97% token reduction), on-chain risk, SEC filings, OSINT, and 8,300+ tool aggregator.

mcp · https://agentdiet-72343955726.us-central1.run.app/mcp · auth: none

Hosted MCP policy proxy for agent fleets: per-run spend caps, kill switch, loop breaker, dry-run of destructive writes with a diff, and a hash-chained audit log.

mcp · https://agentwares-agentguard.vercel.app/api/mcp · auth: none for pricing and spend report; Bearer account key for the rest

Token cost, LLM energy, agent-hour and Proof-Adjusted Autonomy calculators by Michał Piszczek.

api · https://piszczek.pl/tools/api · auth: None — open endpoint

Read-only market data for AI training data: published prices with sources, market rates per kind of data, buyers and their terms, deals, court rulings, and a free data valuation.

mcp · https://aidata.broker/mcp · auth: none

Remote MCP server that lets AI agents search 1,000+ apps and 400+ expert-built Skills by intent, read live action schemas and run actions with OAuth, vault-held credentials and an audit log.

mcp · https://loadout.aident.ai/mcp · auth: OAuth 2.1

Structured records over REST, useful as an agent-writable lightweight database.

api · https://api.airtable.com/v0/{baseId}/{table} · auth: Bearer personal access token

Read and write Airtable bases, tables and records through MCP.

mcp · npx -y airtable-mcp-server · auth: Airtable personal access token env var

Buy tested SKILL.md agent skill files per file over x402 (USDC on Base), no account; plus 10 deterministic pay-per-call repair APIs.

api · https://api.aiskills402.com/v1 · auth: none (x402 payment per request)

Instances, LKE clusters, object storage and DNS over REST.

api · https://api.linode.com/v4/linode/instances · auth: Bearer personal access token

Hosted keyword and faceted search with sub-50ms responses.

api · https://{appid}-dsn.algolia.net/1/indexes/{index}/query · auth: App ID + API key headers

Open threat exchange indicators for IPs, domains, files and URLs.

api · https://otx.alienvault.com/api/v1/indicators/IPv4/<ip>/general · auth: X-OTX-API-KEY header

Directory of AI agents (A2A, MCP, API) with self-run verification badges.

mcp · https://allagents.app/mcp · auth: none

Game Of Thrones API.

api · https://anapioficeandfire.com/ · auth: None — open endpoint

Claude models with tool use, long context and streaming responses.

api · https://api.anthropic.com/v1/messages · auth: x-api-key header

Repairs a JSON payload that failed its JSON Schema. Structural repairs only; ambiguous cases refused with a reason code.

mcp · https://ao-payload-rescue-production.up.railway.app/mcp · auth: none

Extract text and metadata from a thousand file types over HTTP PUT.

api · http://<host>:9998/tika · auth: None (self-hosted)

An Indian Government platform that provides a lot of APIS for KYC, business, education & employment.

api · https://www.apisetu.gov.in/ · auth: None — open endpoint

PDF generation and merging across Chrome, LibreOffice and wkhtmltopdf engines.

api · https://v2.api2pdf.com/chrome/pdf/url · auth: Authorization header (api key)

Runs thousands of Apify scrapers as tools.

mcp · https://mcp.apify.com/ · auth: Bearer API token

Geospatial data for Mexico City public transport system (Metro, Metrobús, Cablebús, RTP, etc.).

api · https://apimetro.dev/swagger/index.html · auth: None — open endpoint

Dynamically generate images and PDFs from templates with a simple API.

api · https://apitemplate.io · auth: API key

Screen any ship by IMO for OFAC/EU/UN/UK sanctions, ownership opacity and a vetting grade.

api · https://arcnautical.com/developers/ · auth: None — open endpoint

Search preprints on arXiv.

api · https://export.arxiv.org/api/query · auth: none

Reads and updates Asana projects and tasks.

mcp · https://mcp.asana.com/sse · auth: OAuth 2.1

Speech-to-text with diarisation, summaries and topic detection.

api · https://api.assemblyai.com/v2/transcript · auth: Authorization header (api key)

Official Astro documentation search over MCP.

mcp · https://mcp.docs.astro.build/mcp · auth: None (public)

Jira and Confluence access for agents.

mcp · https://mcp.atlassian.com/v1/sse · auth: OAuth 2.1

Validate EN 16931 e-invoices: XRechnung, ZUGFeRD, Factur-X, Peppol BIS.

api · https://api.attestwire.com/docs · auth: API key

Easy to implement, adaptable authentication and authorization platform.

api · https://auth0.com · auth: API key

Social media autoposting MCP server from autoposting.ai.

mcp · https://app.autoposting.ai/mcp · auth: none

Job openings MCP server from avagama.co.

mcp · https://openings.avagama.co/mcp · auth: none

164,068 aircraft accident narratives from 128 official investigation authorities, plus FAA data.

api · https://himaxym.com/developers · auth: None — open endpoint

NOAA aviation weather forecasts and observations.

api · https://www.aviationweather.gov/dataserver · auth: None — open endpoint

Field-oriented text processing and quick aggregation.

cli · awk · auth: none

Full programmatic control of every AWS service from one binary.

cli · aws · auth: IAM credentials / SSO

AWS Labs collection: docs, cost, CDK, Lambda and service-specific MCP servers.

mcp · uvx awslabs.aws-documentation-mcp-server@latest · auth: AWS credentials for service servers

Layout-aware document extraction: tables, key-value pairs, forms and handwriting.

api · https://<resource>.cognitiveservices.azure.com/documentintelligence/documentModels/prebuilt-layout:analyze · auth: Ocp-Apim-Subscription-Key header

Microsoft's MCP server for Azure resources, storage, Cosmos DB and monitoring.

mcp · npx -y @azure/mcp@latest server start · auth: Azure identity / service principal

Cheap object storage with a native API and S3-compatible endpoint.

api · https://api.backblazeb2.com/b2api/v3/b2_authorize_account · auth: HTTP Basic then bearer token

Generate branded images and video from templates via API.

api · https://api.bannerbear.com/v2/images · auth: Bearer project key

Open echo endpoint that reflects method, path, headers and body as JSON — a one-URL check that an agent's request left correctly.

api · https://echo.free.beeceptor.com · auth: none

Disposable inboxes for automated email testing, with OTP extraction.

api · https://best-tempmail.com/api · auth: None — open endpoint

Uptime monitors, heartbeats and on-call incidents via API.

api · https://uptime.betterstack.com/api/v2/monitors · auth: Bearer API token

Bhagavad Gita API in telugu and odia languages.

api · https://gita-api.vercel.app · auth: None — open endpoint

Every open public tender in the European Union, rebuilt daily from the official TED data.

api · https://jaydemks.github.io/bidledger/api.html · auth: None — open endpoint

Cloud data warehouse list prices, read daily from AWS and Azure pricing APIs, with price history.

api · https://bigdataexplained.com/data · auth: None — open endpoint

Coordinates to locality, country and administrative divisions, free client tier.

api · https://api.bigdatacloud.net/data/reverse-geocode-client · auth: None for the client endpoint

One fast toolchain that lints and formats JS, TS, JSON and CSS.

cli · biome check . · auth: None

SMS, WhatsApp and voice messaging through one omnichannel REST API.

api · https://rest.messagebird.com/messages · auth: AccessKey header

Build tool and processes integrations to create efficient development pipelines.

api · https://api-docs.bitrise.io/ · auth: API key

Bitcoin blocks, addresses, transactions and fee estimates.

api · https://blockstream.info/api · auth: none

Convert British OSGB36 easting and northing (British National Grid) to WGS84 latitude and longitude.

api · https://www.getthedata.com/bng2latlong · auth: None — open endpoint

Read-only, no-auth MCP server for Korean business data: ~2.76M businesses across all industries, ~76K public-procurement vendors and open public tenders. Results cite source URLs; no ranking. Operator: Public identity Co., Ltd.

mcp · https://boim.io/api/mcp · auth: none

Enterprise content management: files, folders, metadata and sign.

api · https://api.box.com/2.0/folders/0/items · auth: Bearer OAuth 2.0 token

Independent web index queryable as JSON — a common grounding source for agents.

api · https://api.search.brave.com/res/v1/web/search · auth: X-Subscription-Token header

Provides legislative information in Apis XML and JSON, as well as files in various formats.

api · https://dadosabertos.camara.leg.br/swagger/api.html · auth: None — open endpoint

Transactional and marketing email, SMS and contact lists.

api · https://api.brevo.com/v3 · auth: api-key header

Free hosting for HTML, JSON, key-value, files, multi-file sites with short URLs and TTL retention.

api · https://brewpage.app · auth: None — open endpoint

German weather service observations and forecasts as clean JSON, no key.

api · https://api.brightsky.dev/weather · auth: None

Cloud browser automation driven in natural language.

mcp · https://mcp.browserbase.com/mcp · auth: None (public session)

Headless Chrome as an HTTP service: screenshots, PDFs and full browser automation.

api · https://production-sfo.browserless.io/screenshot · auth: token query parameter

The fastest continuous integration and continuous delivery platform.

api · https://buddy.works/docs/api/getting-started/overview · auth: OAuth 2.0

JavaScript runtime, bundler and package manager in one binary.

cli · bun · auth: local

Bundle size of any npm package.

api · https://bundlephobia.com/api/size · auth: none

Open-source scheduling: event types, availability and bookings.

api · https://api.cal.com/v2/bookings · auth: Bearer API key

Public holidays for 195+ countries.

api · https://caldays.com/api · auth: None — open endpoint

Worldwide Holidays.

api · https://calendarific.com/ · auth: API key

Scheduled events, invitees and single-use booking links.

api · https://api.calendly.com/scheduled_events · auth: Bearer personal access token

Visa and entry requirements for 199 passports, cited to official sources, verified daily.

api · https://canienter.com · auth: None — open endpoint

Creates and edits Canva designs.

mcp · https://mcp.canva.com/mcp · auth: OAuth 2.1

Low-latency text-to-speech with voice cloning, built for realtime agents.

api · https://api.cartesia.ai/tts/bytes · auth: X-API-Key header

Run and manage browser tests and synthetic API monitors from an agent, with results, locations and runtimes exposed over REST.

api · https://api.checklyhq.com/v1/runtimes · auth: api_key

Bioactive molecules, targets and assay data from EMBL-EBI.

api · https://www.ebi.ac.uk/chembl/api/data/molecule · auth: None

Online open-access digital library for pre-modern Chinese texts.

api · https://ctext.org/tools/api · auth: None — open endpoint

Chroma vector database as an MCP server for retrieval and memory.

mcp · uvx chroma-mcp · auth: None locally, API key for Chroma Cloud

Free tracker of Claude Code usage-limit resets announced by @ClaudeDevs and Claude Code team members, plus Codex resets. Offers RSS feeds, an ICS calendar, a JSON API (/api/resets), a status-line script and a read-only remote MCP server. Not affiliated with Anthropic.

mcp · https://claude-resets.com/mcp · auth: none

Convert cookie formats, check Claude sessions and generate Claude Code credentials.

api · https://claudecookie.com/api/ · auth: None — open endpoint

Official read-oriented MCP server for ClickHouse analytics queries.

mcp · uv run --with mcp-clickhouse mcp-clickhouse · auth: Host, user and password env vars

SMS, voice, fax and postal letters from one REST API.

api · https://rest.clicksend.com/v3/sms/send · auth: HTTP Basic

Tasks, lists, docs and time tracking in one project-management API.

api · https://api.clickup.com/api/v2/list/<list_id>/task · auth: Authorization header (personal token)

Search registered clinical studies.

api · https://clinicaltrials.gov/api/v2/studies · auth: none

Time tracking, timesheets and workspace reports over REST.

api · https://api.clockify.me/api/v1/workspaces · auth: X-Api-Key header

Directory of agent connectors: find a connector for a service or capability in one MCP call.

mcp · https://clono.sh/connectors/clono/mcp · auth: none

File conversion API for 200+ formats, including 3D meshes (STL, OBJ, PLY), documents, images, audio and video.

api · https://api.cloudconvert.com/v2/jobs · auth: Bearer API key

DNS, Workers, caching and zone configuration over REST.

api · https://api.cloudflare.com/client/v4 · auth: Bearer API token

Hosted MCP server answering questions over the full Cloudflare documentation.

mcp · https://docs.mcp.cloudflare.com/mcp · auth: None (public)

Workers, DNS, analytics and logs exposed as remote MCP tools.

mcp · https://observability.mcp.cloudflare.com/mcp · auth: OAuth 2.1

S3-compatible object storage with zero egress fees.

api · https://{account}.r2.cloudflarestorage.com · auth: AWS SigV4

Global internet traffic and security insights.

mcp · https://radar.mcp.cloudflare.com/mcp · auth: OAuth 2.1

Video ingest, encoding and delivery on Cloudflare's network.

api · https://api.cloudflare.com/client/v4/accounts/<account>/stream · auth: Bearer API token

See your own egress IP, colo and TLS info.

api · https://1.1.1.1/cdn-cgi/trace · auth: none

Image and video upload with on-the-fly transformation URLs.

api · https://api.cloudinary.com/v1_1/<cloud_name>/image/upload · auth: API key + signature or HTTP Basic

API calculates and validates the carbon footprint.

api · https://co2offset.io/api.html · auth: None — open endpoint

Read and write docs, tables and rows in Coda.

api · https://coda.io/apis/v1/docs · auth: Bearer API token

Render LaTeX equations in PNG, GIF, SVG, EMF, PDF, JSON, or download formats with styling options.

api · https://editor.codecogs.com/docs/4-LaTeX_rendering.php · auth: None — open endpoint

Codeship is a Continuous Integration Platform in the cloud.

api · https://docs.cloudbees.com/docs/cloudbees-codeship/latest/api-overview/ · auth: API key

Chat, embed and rerank endpoints.

api · https://api.cohere.com/v2 · auth: Bearer API key

Crypto prices, market caps and historical charts, generous free tier.

api · https://api.coingecko.com/api/v3/simple/price · auth: None (demo) / x-cg-api-key

Build and verify compliance evidence packs, ground claims and screen entities.

mcp · https://evidence.dropwatchhq.com/mcp · auth: none

Up-to-date library documentation injected straight into an agent's context.

mcp · https://mcp.context7.com/mcp · auth: None (optional API key)

Document, image and 3D/CAD file conversion over a single REST call.

api · https://v2.convertapi.com/convert · auth: Bearer API token

UK Government coronavirus data, including deaths and cases by region.

api · https://coronavirus.data.gov.uk/details/developers-guide · auth: None — open endpoint

Integration to provide information and prepare shipments using Correio's services.

api · https://cws.correios.com.br/ajuda · auth: API key

Real US phone number and email for your AI Chief of Staff via remote MCP.

mcp · https://cosvoice.com/mcp · auth: oauth

Single send API that routes a message to email, SMS, Slack or push per user preference.

api · https://api.courier.com/send · auth: Bearer API key

Government measures tracker to fight against the Covid-19 pandemic.

api · https://covidtracker.bsg.ox.ac.uk · auth: None — open endpoint

Covid 19 statistics state and district wise about cases, vaccinations, recovery within India.

api · https://data.covid19india.org/ · auth: None — open endpoint

Coworking spaces and offices in 63 European and Gulf cities with operator-published prices.

api · https://coworkingview.com/openapi.json · auth: None — open endpoint

Generate PDF documents from templates with a drop-and-drop editor and a simple API.

api · https://craftmypdf.com · auth: API key

Rust crate metadata, versions, owners and download counts.

api · https://crates.io/api/v1 · auth: none (User-Agent required)

Monitors cron jobs, queues and endpoints with telemetry pings.

api · https://cronitor.link/p/<api_key>/<monitor_key> · auth: API key in path

Metadata for scholarly publications, DOIs and citations.

api · https://api.crossref.org/works · auth: none

Certificate transparency lookup for a domain.

api · https://crt.sh · auth: none

Generate certificate signing requests and private keys without OpenSSL.

api · https://csr.plus/docs/api · auth: None — open endpoint

The universal fallback when no SDK or MCP server exists yet.

cli · curl -sS -H 'Authorization: ...' · auth: per target

Official CVE record by identifier.

api · https://cveawg.mitre.org/api/cve · auth: none

Interpreted astronomy: sun and moon times, moon phases, planets, eclipses, seasons.

api · https://www.cyclecalcs.com/api.html · auth: None — open endpoint

Create video-call rooms and tokens with one REST call.

api · https://api.daily.co/v1/rooms · auth: Bearer API key

Search current offers on dajsve.com. Use Croatian search terms. Present detailsUrl for more information and clickUrl when the user wants to open or buy an offer.

mcp · https://www.dajsve.com/mcp · auth: none

French open-data portal: search datasets, resources and organisations.

api · https://www.data.gouv.fr/api/1/datasets/ · auth: None for reads

US federal open-data catalogue searchable through the CKAN action API.

api · https://catalog.data.gov/api/3/action/package_search · auth: None for reads

Datacircle lists all the GTM APIs.

mcp · https://api.datacircle.dev/mcp · auth: None

DOI metadata for research datasets, software and preprints.

api · https://api.datacite.org/dois · auth: None for reads

Submit and query metrics, logs, events and monitors.

api · https://api.datadoghq.com/api/v2/series · auth: DD-API-KEY header

Word-finding query engine.

api · https://www.datamuse.com/api/ · auth: None — open endpoint

Ephemeral zero-knowledge encrypted data sharing.

api · https://api.dead-drop.xyz/api/v1/docs · auth: None — open endpoint

AI for code review.

api · https://www.deepcode.ai · auth: None — open endpoint

Speech-to-text transcription with diarization, streaming and 30+ languages.

api · https://api.deepgram.com/v1/listen · auth: Token header

High-quality machine translation across 30+ languages with formality control.

api · https://api-free.deepl.com/v2/translate · auth: DeepL-Auth-Key header

MCP server for DeepSeek V4.1 Flash and V4 Pro: text and visual chat, Responses API, FIM completion, Files API, model discovery and balance checks.

mcp · npx -y deepseek-mcp-server · auth: api_key

Ask questions about any public GitHub repository through indexed wikis.

mcp · https://mcp.deepwiki.com/mcp · auth: None

Dependency graphs, licenses and advisories across npm, PyPI, Go, Maven, Cargo.

api · https://api.deps.dev/v3alpha · auth: none

Free DNS hosting with a full REST API and DNSSEC by default.

api · https://desec.io/api/v1/domains/<domain>/rrsets/ · auth: Token header

Query DNS records from the shell.

cli · dig · auth: none

Droplets, databases, App Platform and Spaces over one REST API.

api · https://api.digitalocean.com/v2/droplets · auth: Bearer personal access token

Bot-driven access to guilds, channels and messages.

api · https://discord.com/api/v10 · auth: Bot token header

Validate and detect disposable and temporary email addresses.

api · https://www.disify.com/ · auth: None — open endpoint

Contains D.C. government public datasets, including crime, GIS, financial data, and so on.

api · http://opendata.dc.gov/pages/using-apis · auth: None — open endpoint

Document conversion: PDF to Markdown, OCR on images, spreadsheet parsing, URL to clean text.

mcp · https://doc-convert-mcp.onrender.com/mcp/ · auth: none

Build, run and ship containers — the standard sandbox for agent-executed code.

cli · docker · auth: docker login

List image repositories, tags and digests.

api · https://hub.docker.com/v2 · auth: none for public repos

IBM's document converter producing structured JSON/Markdown from PDFs and Office files.

cli · docling path/to/file.pdf --to md · auth: None

AI extraction of invoices, receipts, bank statements & contracts into structured JSON/CSV.

api · https://docstruct.pages.dev · auth: None — open endpoint

Merchant of record payments and subscriptions.

mcp · https://mcp.dodopayments.com/sse · auth: Bearer API key

Registered Domain Names Search.

api · https://domainsdb.info/ · auth: None — open endpoint

Shorten a long URL easily and fast.

api · https://wiki.drivet.xyz/en/url-shortener/add-links · auth: None — open endpoint

File upload, download, listing and sharing links.

api · https://api.dropboxapi.com/2/files/list_folder · auth: Bearer OAuth 2.0 token

GraphQL API for creating and managing ephemeral e-mail inboxes.

api · https://dropmail.me/api/#live-demo · auth: None — open endpoint

Drupal.org.

api · https://www.drupal.org/drupalorg/docs/api · auth: None — open endpoint

In-process analytical SQL over CSV, Parquet and JSON without a server.

cli · duckdb · auth: None

API explorer that gives a query URL with a JSON response of locations and cities.

api · https://gis.ducks.org/datasets/du-university-chapters/api · auth: None — open endpoint

Generate placeholder images with custom size, colors and text.

api · https://dummyimage.com/ · auth: None — open endpoint

Realistic fake data over REST — products, carts, users, posts, quotes, recipes — plus a token auth flow, no key required.

api · https://dummyjson.com/test · auth: none

Amazon product, keyword, sales estimate, reverse ASIN, market and trademark research data for AI agents over a remote MCP server.

mcp · https://ecommercedataapi.com/mcp · auth: OAuth 2.1 (browser) or Bearer API key

Cross-ecosystem package metadata.

api · https://packages.ecosyste.ms/api/v1 · auth: none

Deploys HTML to a public edge URL in one call.

mcp · https://mcp-on-edge.edgeone.app/mcp-server · auth: None (public)

Email sending and contact lists over a simple REST API.

api · https://api.elasticemail.com/v4/emails · auth: X-ElasticEmail-ApiKey header

Official server letting an agent query Elasticsearch indices in natural language.

mcp · npx -y @elastic/mcp-server-elasticsearch · auth: Elasticsearch URL + API key env vars

Text-to-speech with cloned and multilingual voices, streaming supported.

api · https://api.elevenlabs.io/v1/text-to-speech/{voice_id} · auth: xi-api-key header

Send a test message and get a spam score, 41 checks with RFC citations and a fix plan.

api · https://email-spam-tester.com/api-docs/ · auth: None — open endpoint

Validate email syntax and MX, detect disposable/role addresses, suggest typo fixes.

api · https://email.lifestep.io · auth: None — open endpoint

Make PDF forms fillable, fill them from data or documents, read filled forms back, and fax them. 27 MCP tools over streamable HTTP.

mcp · https://api.getemboss.ai/mcp · auth: OAuth 2.1 sign-in or an Emboss API key as a bearer token; the tool list needs no sign-in

Support and end-of-life dates for 300+ products and runtimes.

api · https://endoflife.date/api · auth: none

Search and read plain-English UK electrical safety guides (EICRs, landlord duties, consumer units, EV chargers in London) over MCP; free, read-only, no key.

mcp · https://energynorth.uk/api/mcp · auth: none

Genes, variants, sequences and comparative genomics across species.

api · https://rest.ensembl.org/lookup/symbol/homo_sapiens/<gene> · auth: None

Configurable JavaScript and TypeScript linter with autofix.

cli · eslint . --fix · auth: None

Official EU service checking whether a VAT number is valid and to whom it belongs.

api · https://ec.europa.eu/taxation_customs/vies/rest-api/ms/<country>/vat/<number> · auth: None

Search life-science literature and full texts.

api · https://www.ebi.ac.uk/europepmc/webservices/rest/search · auth: none

European statistics datasets in JSON-stat, filterable by dimension.

api · https://ec.europa.eu/eurostat/api/dissemination/statistics/1.0/data/<dataset> · auth: None

Reference server exercising every MCP feature — ideal for client testing.

mcp · npx -y @modelcontextprotocol/server-everything · auth: None (stdio)

Evil Insults.

api · https://evilinsult.com/api · auth: None — open endpoint

Neural search over the web with semantic queries and full-text retrieval.

api · https://api.exa.ai/search · auth: x-api-key header

Neural web search and page fetch for agents.

mcp · https://mcp.exa.ai/mcp · auth: None (public)

Foreign exchange rates and currency conversion, no signup for basic use.

api · https://api.exchangerate.host/latest · auth: None (access key for higher tiers)

Read, write and strip metadata in images, video and documents.

cli · exiftool -all= photo.jpg · auth: None

Read-only lookup for published face-shape guide records.

api · https://myfaceshapechart.com/openapi.json · auth: None — open endpoint

Fake store rest API for your e-commerce or shopping website prototype.

api · https://fakestoreapi.com/ · auth: None — open endpoint

Hosted inference for image, video and audio models with a queue API.

api · https://fal.run/fal-ai/flux/dev · auth: Key authorization header

Reference server that fetches a URL and converts it to markdown for the model.

mcp · uvx mcp-server-fetch · auth: None

Reference server that fetches a URL and converts it to markdown for the model.

mcp · uvx mcp-server-fetch · auth: None

Media transcoding an agent can drive deterministically from a prompt.

cli · ffmpeg -i in.mp4 out.webm · auth: none

Figma's Dev Mode server exposing selected frames, variables and code hints.

mcp · http://127.0.0.1:3845/mcp · auth: Local Figma desktop session

Super simple file sharing, convenient, anonymous and secure.

api · https://www.file.io · auth: None — open endpoint

Filestack File Uploader & File Upload API.

api · https://www.filestack.com · auth: API key

Reference MCP server exposing sandboxed read/write access to local directories.

mcp · npx -y @modelcontextprotocol/server-filesystem /path · auth: None (path allow-list)

Reference server giving agents scoped read/write access to local directories.

mcp · npx -y @modelcontextprotocol/server-filesystem <allowed-dir> · auth: None (local stdio, path-scoped)

Lists of filters for adblockers and firewalls.

api · https://filterlists.com · auth: None — open endpoint

Final Space API.

api · https://finalspaceapi.com/docs/ · auth: None — open endpoint

US cold plunge and sauna venues with dated, source-quoted temperatures and prices.

api · https://findsaunaplunge.com/api/ · auth: None — open endpoint

Turn any URL or whole site into clean markdown ready for a model context.

api · https://api.firecrawl.dev/v1/scrape · auth: Bearer API key

Web scraping, crawling and search as MCP tools.

mcp · https://mcp.firecrawl.dev/mcp · auth: None (keyless session)

Fake REST API with chaos controls: force any status code, add latency, or a failure rate.

api · https://flakyapi.dev · auth: None — open endpoint

Start, stop and inspect Firecracker VMs across regions over REST.

api · https://api.machines.dev/v1/apps/<app>/machines · auth: Bearer Fly API token

Reference exchange rates from the ECB, free and keyless.

api · https://api.frankfurter.app/latest · auth: None

English definitions, phonetics and synonyms for a word.

api · https://api.dictionaryapi.dev/api/v2/entries/en/hello · auth: none

Helpdesk tickets, contacts and conversations over REST.

api · https://<domain>.freshdesk.com/api/v2/tickets · auth: HTTP Basic (api key)

Some Game of Thrones quotes.

api · https://gameofthronesquotes.xyz/ · auth: None — open endpoint

Global biodiversity occurrence records and taxonomic backbone.

api · https://api.gbif.org/v1/occurrence/search · auth: None for reads

Geocoding, autocomplete and places search built on OpenStreetMap data.

api · https://api.geoapify.com/v1/geocode/search · auth: apiKey query parameter

Provides worldwide forward/reverse geocoding, batch geocoding and geoparsing.

api · https://geocode.xyz/api · auth: None — open endpoint

Score content for AI search citation readiness with a 0-100 GEO score and 8 structural metrics.

api · https://geoscoreapi.com · auth: API key

Implement OTP flow quickly.

api · https://otp.dev/en/docs/ · auth: API key

Build applications using the world's most powerful imagery.

api · http://developers.gettyimages.com/en/ · auth: OAuth 2.0

GitHub from the shell. gh pr create, gh issue list --json for parsing.

cli · gh <command> --json · auth: gh auth login

PostScript/PDF interpreter used to compress, convert and rasterise PDFs.

cli · gs -sDEVICE=pdfwrite -o out.pdf in.pdf · auth: None

Create, optimise and edit animated GIFs from the command line.

cli · gifsicle --optimize=3 in.gif -o out.gif · auth: None

Version control operations agents need to inspect and change codebases.

cli · git <command> [args] · auth: SSH key or token

Official MCP server exposing git status, diff, log, commit and branches.

mcp · uvx mcp-server-git --repository /path/to/repo · auth: None (local filesystem)

Git.io URL shortener.

api · https://github.blog/2011-11-10-git-io-github-url-shortener/ · auth: None — open endpoint

Create an image of your GitHub contributions.

api · https://github-contributions.vercel.app · auth: None — open endpoint

Repos, issues, pull requests and code search as first-class tools.

mcp · https://api.githubcopilot.com/mcp · auth: OAuth 2.1

Official MCP server exposing repos, issues, PRs and code search as tools.

mcp · https://api.githubcopilot.com/mcp/ · auth: OAuth or PAT bearer

Repositories, issues, pull requests, actions and releases as HTTP resources.

api · https://api.github.com · auth: Bearer personal access token

Projects, issues, merge requests and pipelines.

api · https://gitlab.com/api/v4 · auth: Bearer personal or project access token (public reads need none)

Detect hardcoded secrets in git history and working trees.

cli · gitleaks detect --source . · auth: None

Turns any GitHub repository into a documentation MCP server.

mcp · https://gitmcp.io/docs · auth: None (public)

Global legal-entity identifiers with official name, address and status.

api · https://api.gleif.org/api/v1/lei-records · auth: None

Network probes from thousands of locations.

mcp · https://mcp.globalping.dev/mcp · auth: OAuth 2.1

Run build targets from a Makefile.

cli · make · auth: none

Go module versions and metadata.

api · https://proxy.golang.org · auth: none

Diagnose a brand's visibility in AI answers (ChatGPT, Perplexity, Google AI Overviews, Amazon Rufus).

mcp · https://mcp.goaimoat.com/mcp · auth: none

Unlimited size file uploads for free.

api · https://gofile.io/api · auth: API key

Play a free persistent MMORPG as an AI agent over MCP: join in one call, then look, move, attack, cast, use items, talk and trade with NPCs, and take Lantern Guild expeditions. 13 tools, 4 reference resources.

mcp · https://golemreach.com/mcp · auth: none (golemreach_connect returns a per-character token and sessionId)

Create, list and update calendar events on behalf of a user.

api · https://www.googleapis.com/calendar/v3/calendars/{calendarId}/events · auth: OAuth 2.0 bearer token

OCR, label detection and document text extraction from images.

api · https://vision.googleapis.com/v1/images:annotate · auth: Bearer OAuth token or API key

Upload, search, share and export files in Drive.

api · https://www.googleapis.com/drive/v3/files · auth: Bearer OAuth 2.0 token

Gemini text, vision and embedding models.

api · https://generativelanguage.googleapis.com/v1beta/models · auth: API key (x-goog-api-key header or key query param)

Place search, details and geocoding for location-aware agents.

api · https://places.googleapis.com/v1/places:searchText · auth: X-Goog-Api-Key header

Resolve DNS records over HTTPS as JSON.

api · https://dns.google/resolve · auth: none

Task lists and tasks tied to a Google account.

api · https://tasks.googleapis.com/tasks/v1/lists/<list>/tasks · auth: Bearer OAuth 2.0 token

Self-hosted HTTP service that converts HTML, Markdown and Office files to PDF.

api · http://<host>:3000/forms/chromium/convert/html · auth: None (deploy behind your own gate)

Manage dashboards, datasources, alerts and annotations programmatically.

api · https://<grafana-host>/api/dashboards/db · auth: Bearer service account token

Official server for dashboards, Prometheus/Loki queries and incidents.

mcp · docker run -i --rm grafana/mcp-grafana · auth: Grafana URL + service account token

Routing, map matching and route optimisation as a hosted API.

api · https://graphhopper.com/api/1/route · auth: key query parameter

Tells you whether an IP is internet-wide background noise or targeted.

api · https://api.greynoise.io/v3/community/<ip> · auth: key header (free community key)

Very low latency OpenAI-compatible inference.

api · https://api.groq.com/openai/v1 · auth: Bearer API key

curl for gRPC: list services and call methods using reflection.

cli · grpcurl -plaintext host:50051 list · auth: None

Match an SBOM or image against vulnerability databases.

cli · grype dir:. · auth: None

Disposable temporary Email addresses.

api · https://www.guerrillamail.com/GuerrillaMailAPI.html · auth: None — open endpoint

Web-API for fetching data from Project Gutenberg Books Library.

api · https://gutendex.com/ · auth: None — open endpoint

Compress and decompress single files and streams.

cli · gzip · auth: none

Public, auth-free feed of stories, comments and users.

api · https://hacker-news.firebaseio.com/v0/topstories.json · auth: None

Full-text search over Hacker News stories and comments.

api · https://hn.algolia.com/api/v1/search · auth: none

IP geolocation, ISP and privacy/VPN scoring, email breach checks, DNS and WHOIS lookups.

api · https://hackmyip.com/api · auth: None — open endpoint

Dockerfile linter enforcing best practices and shell correctness.

cli · hadolint Dockerfile · auth: None

Radar-detected hail history for any US address from NOAA NEXRAD Level-III hail detections, by year.

api · https://hail-history-noaa.netlify.app/api-docs.html · auth: None — open endpoint

Check whether an email or password appears in known breaches.

api · https://haveibeenpwned.com/api/v3/breachedaccount/<account> · auth: hibp-api-key header (range API is keyless)

Dead-man's-switch monitoring for cron jobs and scheduled agents.

api · https://hc-ping.com/<uuid> · auth: None for pings, X-Api-Key for management

MCP server for working with Helm charts and Kubernetes packages.

mcp · https://mcp-helm.zekker.dev/mcp · auth: none

Enterprise-grade geocoding, autosuggest and place lookup.

api · https://geocode.search.hereapi.com/v1/geocode · auth: apiKey query parameter

Provision servers, volumes, networks and firewalls via REST.

api · https://api.hetzner.cloud/v1/servers · auth: Bearer project token

Elixir and Erlang package metadata.

api · https://hex.pm/api · auth: none

List universities by country or name.

api · http://universities.hipolabs.com/search · auth: none

Face detection, face recognition with age estimation/gender estimation, accurate, no quota limits.

api · https://faceapi.hirak.site/ · auth: API key

Image to text -text recognition- from image more than 100 language, accurate, unlimited requests.

api · https://ocr.hirak.site/ · auth: API key

Translate between 21 of most used languages, accurate, unlimited requests.

api · https://translate.hirak.site/ · auth: API key

Local-first runtime firewall for AI coding agents: reviews shell, secrets, MCP, and package-install calls before they hit the OS.

cli · pipx install hol-guard && hol-guard init · auth: none

Expose smart-home entities and services to an agent.

mcp · https://<ha-host>/mcp_server/sse · auth: Bearer long-lived access token

Provide weather information, earthquake information, and climate data.

api · https://www.hko.gov.hk/en/abouthko/opendata_intro.htm · auth: None — open endpoint

Inbound webhook gateway with queuing, replay and inspection.

api · https://api.hookdeck.com/2025-01-01/events · auth: Bearer API key

Time tracking, tasks and team chat MCP so agents can log time and work on the same board as humans.

mcp · https://hourtick.com/api/mcp · auth: none

Echo any HTTP request back as JSON: headers, body, status codes, redirects, auth schemes and delays, no key required.

api · https://httpbin.org/get · auth: none

HTTP request and response testing service. No API key.

api · https://httpbingo.org/ · auth: none

Human-friendly HTTP client with JSON defaults and coloured output.

cli · http POST api.example.com/items name=foo · auth: None

Contacts, companies, deals and tickets.

api · https://api.hubapi.com/crm/v3 · auth: Bearer private app token or OAuth 2.0

CRM records and engagements from HubSpot.

mcp · https://mcp.hubspot.com/anthropic · auth: OAuth 2.1

Serverless inference across thousands of hosted community models.

api · https://router.huggingface.co/v1/models · auth: Bearer token

Hosted MCP server over models, datasets, Spaces and inference.

mcp · https://huggingface.co/mcp · auth: Bearer HF token

Humanitarian Data Exchange (HDX) is open platform for sharing data across crises and organisations.

api · https://data.humdata.org/ · auth: None — open endpoint

Favicons for any website, with fallbacks.

api · https://icon.horse · auth: None — open endpoint

Search and fetch SVG icons from 200+ open source icon sets.

api · https://iconify.design/docs/api/ · auth: None — open endpoint

Icons (find \\"search icon\\" hyperlink in page).

api · https://img.icons8.com/ · auth: None — open endpoint

PDF toolbox API: merge, split, compress, OCR, watermark, convert.

api · https://api.ilovepdf.com/v1/start/<tool> · auth: Bearer JWT from project key

Resize, convert, composite and inspect images from the command line.

cli · magick · auth: None

Photo to textured printable 3D STL converter for makers (freemium web tool).

api · https://imagetostl.im/ · auth: none

Simple and quick private image sharing.

api · https://api.imgbb.com/ · auth: API key

Species observations, identifications and taxa from a citizen-science network.

api · https://api.inaturalist.org/v1/observations · auth: None for public reads

Free, keyless daily wholesale mandi prices for 5 Indian states, sourced from data.gov.in.

api · https://mandi-api.vercel.app/docs · auth: None — open endpoint

French official registry of companies and establishments (SIREN/SIRET).

api · https://api.insee.fr/api-sirene/3.11/siren/<siren> · auth: X-INSEE-Api-Key-Integration header

Post to and update maintenance and incidents on your status page through an HTTP REST API.

api · https://instatus.com/help/api · auth: API key

Support conversations and contacts from Intercom.

mcp · https://mcp.intercom.com/mcp · auth: OAuth 2.1

Generates a video from a text script.

mcp · https://mcp.invideo.io/mcp · auth: None (public)

IP geolocation with proxy, VPN and datacenter risk and the age of the evidence.

api · https://ip99.com/api · auth: None — open endpoint

IP geolocation: country, city, timezone and ASN for an IP address.

api · https://ipapi.co/json/ · auth: optional key

IP geolocation with ASN, timezone, currency and threat data, 5,000 keyless calls a day.

api · https://ipgeolocationapi.io/docs · auth: None — open endpoint

Geolocation and network owner of an IP.

api · https://ipinfo.io · auth: Bearer token (optional at low volume)

Free VPN, proxy, Tor and datacenter IP detection. 13 sources, active probing.

api · https://iplogs.com/docs · auth: None — open endpoint

IP geolocation and network owner, no key.

api · https://ipwho.is · auth: none

Community IP blacklist to check and report abusive IP addresses.

api · https://ipwhois.net/blacklist/docs · auth: None — open endpoint

Live web search, URL reading, embeddings and reranking.

mcp · https://mcp.jina.ai/sse · auth: None (public)

Issues, projects, sprints and JQL search.

api · https://YOUR-SITE.atlassian.net/rest/api/3 · auth: Basic auth with email plus API token, or OAuth 2.0 (3LO)

Free MCP tools for IBAN verification, Peppol readiness, payment-change checks, Peppol participant lookup, and payment preflight for AI agents.

mcp · https://jithox.com/api/mcp · auth: none

Stream-oriented JSON processor — the glue between two API calls.

cli · jq · auth: None

Resolve npm and GitHub package versions, list files, read usage stats.

api · https://data.jsdelivr.com/v1 · auth: none

Convert JSON to JSONP (on-the-fly) for easy cross-domain data requests using client-side JavaScript.

api · https://json2jsonp.com/ · auth: None — open endpoint

Fake REST resources (posts, comments, users, todos, albums, photos) that accept GET/POST/PUT/DELETE, no key required.

api · https://jsonplaceholder.typicode.com/todos/1 · auth: none

Publish the website you built with AI to a live public URL, straight from chat, with no setup.

mcp · https://mcp.justpublish.ai/ · auth: none

Scriptable load testing for HTTP APIs with thresholds and summaries.

cli · k6 run script.js · auth: None

Real-time worldwide wildfire detections, water bomber tracking and open fire archive.

api · https://kanari.io/en/api · auth: None — open endpoint

Verified UK company profiles with an AI summary and accuracy score, from Companies House data.

api · https://meetkatalis.com/apis · auth: API key

Generate and edit images with AI, no key or account required.

api · https://kavel.readthedocs.io/ · auth: None — open endpoint

KDP niche demand scores, competition analysis and revenue estimates.

api · https://kdp-intelligence-api.vercel.app/docs · auth: None — open endpoint

Tell whether an email domain is disposable, no key required.

api · https://open.kickbox.com/v1/disposable · auth: none

Russian company data from state registers by INN or OGRN: profile, finances, timeline.

api · https://kontragentpro.ru/api/v2/docs · auth: None — open endpoint

Inspect and operate Kubernetes clusters through MCP tools.

mcp · npx -y mcp-server-kubernetes · auth: Local kubeconfig

Help board for AI agents: post a problem you are stuck on, search open problems by keyword, and offer what worked to an agent stuck on something you solved.

api · https://lacuna.mergeinc.workers.dev · auth: none (self-minted X-Lacuna-Id header from POST /api/id; no signup)

Over 100 free 5-minute learning modules on sales and communication (German), from latzerus.ch.

mcp · https://mcp.latzerus.ch/mcp · auth: none

Spaceflight launches and events database.

api · https://thespacedevs.com/llapi · auth: None — open endpoint

Structured read-only A-share stock & concept-board news-flow heat: concept/ticker tags, summary key points, heat rankings. REST + remote MCP + Agent Skill. Freemium.

mcp · https://lava.ai-dolphin.com/subscribe/v1/mcp · auth: Bearer API key header

Find verified legal specialists in Georgia from natural-language queries.

api · https://legal.ge/api/openapi.json · auth: None — open endpoint

Checkouts, subscriptions and licenses as merchant of record.

api · https://api.lemonsqueezy.com/v1 · auth: Bearer API key

Metadata, dependencies and release history for open-source packages across 30+ managers.

api · https://libraries.io/api · auth: API key

Convert Office documents to PDF, DOCX, XLSX or CSV without a GUI.

cli · soffice --headless --convert-to pdf file.docx · auth: None

Translation tool with 17 available languages.

api · https://libretranslate.com/docs · auth: None — open endpoint

Push messages to LINE users and groups, dominant in Japan and Taiwan.

api · https://api.line.me/v2/bot/message/push · auth: Bearer channel access token

GraphQL issue tracker. Strong schema, great for planning agents.

api · https://api.linear.app/graphql · auth: API key header

Official hosted MCP server for issues, projects and cycles.

mcp · https://mcp.linear.app/mcp · auth: OAuth 2.1

Manage issues, projects and cycles from an agent session.

mcp · https://mcp.linear.app/mcp · auth: OAuth

Realtime audio/video rooms and agent sessions over WebRTC.

api · https://<project>.livekit.cloud/twirp/livekit.RoomService/CreateRoom · auth: Bearer JWT signed with API secret

Live US state DOT traffic cameras with verified live status and measured uptime.

api · https://bzsasson.github.io/traffic-camera-sources/api.html · auth: None — open endpoint

URL shortener with analytics, QR codes, UTM tags and custom domains.

api · https://lix.li/api · auth: API key

Parses complex PDFs into clean Markdown for retrieval pipelines.

api · https://api.cloud.llamaindex.ai/api/parsing/upload · auth: Bearer API key

US Address Verification.

api · https://lob.com/ · auth: API key

Nominatim-compatible geocoding and reverse geocoding with a generous free tier.

api · https://us1.locationiq.com/v1/search · auth: key query parameter

Public biological age competition data with biomarkers and rankings.

api · https://longevityworldcup.com/api/data/athletes · auth: None — open endpoint

Transactional email and lifecycle campaigns for SaaS products.

api · https://app.loops.so/api/v1 · auth: Bearer API key

Icons with predone Animations.

api · https://lordicon.com/ · auth: None — open endpoint

Images from Unsplash.

api · https://picsum.photos/ · auth: None — open endpoint

Predicted and actual air quality components for The Netherlands (RIVM).

api · https://api-docs.luchtmeetnet.nl/ · auth: None — open endpoint

10 Minute Mail.

api · https://docs.mail.gw · auth: None — open endpoint

Disposable inboxes with an API: create an address, read incoming mail.

api · https://api.mail.tm · auth: none (account token per inbox)

Prevent users to sign up with temporary email addresses.

api · https://www.mailcheck.ai/#documentation · auth: None — open endpoint

Transactional email and templates with a clean REST contract.

api · https://api.mailersend.com/v1/email · auth: Bearer API token

Email sending, routing, validation and inbound parsing.

api · https://api.mailgun.net/v3 · auth: Basic auth (api:key)

Email API for transactional and marketing email. Free tier: 200 emails/day.

api · https://api.mailjet.com/v3/REST/ · auth: apiKey

Safe email sandbox plus a sending API: test messages without reaching real inboxes.

api · https://send.api.mailtrap.io/api/send · auth: Bearer API token

Real-time email verification API: syntax, MX, SMTP mailbox, disposable and catch-all detection. 1,000 free credits, pay-as-you-go from $9 per 10k, credits never expire.

api · https://api.mailveri.com/v1/verify-mail/ · auth: Bearer API key

Provide malware datasets and threat intelligence feeds.

api · https://maldatabase.com/api-doc.html · auth: API key

Malware Archive / file sourcing.

api · https://malshare.com/doc.php · auth: API key

Detonates files and URLs in instrumented VMs and returns behaviour, IOCs and ATT&CK.

api · https://malwagon.com/docs/api · auth: API key

Collect and share malware samples.

api · https://bazaar.abuse.ch/api/ · auth: API key

Agent protocol. Card: https://mandarincow.com/.well-known/wake.json. Private capsule, shared store, bounty tray for the origin owner. Bearer token from POST /wake/v1/register.

api · https://mandarincow.com/wake/v1 · auth: Bearer token

Forward and reverse geocoding: addresses to coordinates and back.

api · https://api.mapbox.com/geocoding/v5/mapbox.places · auth: access_token query parameter

Search hotels and flights across 3M+ hotels, read hotel details, then prebook and book

mcp · https://mcp.maqami.co/ · auth: none

Microsoft's converter turning PDF, Office, HTML and audio into Markdown for LLMs.

cli · markitdown path/to/file.pdf > out.md · auth: None

Send and read messages on any Matrix homeserver over an open federated protocol.

api · https://matrix.org/_matrix/client/v3/rooms/<roomId>/send/m.room.message · auth: Bearer access token

Self-hostable team chat with a full REST API for posts, channels and users.

api · https://<server>/api/v4/posts · auth: Bearer personal access token

Share Markdown documents as public links, update or delete them.

mcp · https://docs-md.com/api/mcp · auth: none

Chinese content compliance review (17 platforms), EN↔CN translation, and SEO optimization. Pay-per-call via x402 (Solana USDC).

api · https://mediacraft-x402-api.onrender.com · auth: API key

Knowledge-graph persistent memory across sessions, reference implementation.

mcp · npx -y @modelcontextprotocol/server-memory · auth: None

Payments and developer docs for Mercado Pago.

mcp · https://mcp.mercadopago.com/mcp · auth: Bearer access token

Dictionary and Thesaurus Data.

api · https://dictionaryapi.com/ · auth: API key

Generative 3D: text-to-3D and image-to-3D meshes with textures, exportable to GLB/FBX/OBJ/STL.

api · https://api.meshy.ai/openapi/v2/text-to-3d · auth: Bearer API key

Worldwide hourly weather forecast from the Norwegian Meteorological Institute, no key required.

api · https://api.met.no/weatherapi/locationforecast/2.0/compact?lat=48.85&lon=2.35 · auth: none

An open source Business Intelligence server to share data and analytics inside your company.

api · https://www.metabase.com/ · auth: None — open endpoint

Historical weather and climate normals from thousands of stations.

api · https://meteostat.p.rapidapi.com/point/daily · auth: RapidAPI key header

Met Museum of Art.

api · https://metmuseum.github.io/ · auth: None — open endpoint

Torrent URL shorten API.

api · http://mgnet.me/api.html · auth: None — open endpoint

Turn any URL into metadata, a screenshot, a PDF or reader-mode content.

api · https://api.microlink.io/ · auth: None for the free tier

One endpoint for Outlook mail, calendar, Teams, OneDrive and users.

api · https://graph.microsoft.com/v1.0/me/messages · auth: Bearer OAuth 2.0 token

Programmatic interfaces to engage with the Microsoft Security Response Center (MSRC).

api · https://msrc.microsoft.com/report/developer · auth: None — open endpoint

Document parsing for invoices, receipts and IDs with structured field output.

api · https://api.mindee.net/v1/products/mindee/invoices/v4/predict · auth: Token API key header

S3-compatible object storage client for copy, mirror and policy work.

cli · mc cp file.txt myminio/bucket/ · auth: Alias with access/secret key

Mistral chat, embeddings and OCR models.

api · https://api.mistral.ai/v1 · auth: Bearer API key

Realistic mock data generator as an API. Free tier available.

api · https://api.mockaroo.com/api/types · auth: apiKey

LLM pricing, context windows and deprecation dates, schema-validated and updated daily.

api · https://bytebrujo.github.io/modelfax/ · auth: None — open endpoint

Lookup appliance and equipment error codes by brand and code, with recommended replacement parts.

api · https://modelpartfinder.com/docs/api · auth: None — open endpoint

Secure and modern passwordless authentication platform.

api · https://mojoauth.com · auth: API key

European payments: cards, iDEAL, SEPA, Bancontact.

api · https://api.mollie.com/v2 · auth: Bearer API key

GraphQL API for boards, items, updates and automations.

api · https://api.monday.com/v2 · auth: Authorization header (api token)

Queries and administers MongoDB Atlas.

mcp · https://mcp.mongodb.com/mcp · auth: Atlas credentials

Short-form social video editor driven through MCP tools (sign-in required for tool calls).

mcp · https://morphareels.ai/mcp · auth: none

Grades a site's HTTP security headers and configuration.

api · https://observatory-api.mdn.mozilla.net/api/v2/scan · auth: None

Upload, encode and stream video with per-asset playback IDs.

api · https://api.mux.com/video/v1/assets · auth: HTTP Basic (token id + secret)

Public holidays for any country and year.

api · https://date.nager.at/api/v3/PublicHolidays · auth: none

Provides namedays for multiple countries.

api · https://nameday.abalin.net · auth: None — open endpoint

NASA imagery, astronomy picture of the day, near-earth objects and Mars photos.

api · https://api.nasa.gov/planetary/apod · auth: api_key query parameter (DEMO_KEY works)

Global solar and weather data for energy and agriculture.

api · https://power.larc.nasa.gov/docs/ · auth: None — open endpoint

Official US government forecasts, hourly forecasts, alerts and observations, no API key required.

api · https://api.weather.gov/points/38.8894,-77.0352 · auth: none

Multimodal public-transport journeys and schedules across many networks.

api · https://api.navitia.io/v1/coverage/<region>/journeys · auth: HTTP Basic (token as username)

Serverless Postgres branches and SQL for agents.

mcp · https://mcp.neon.tech/mcp · auth: OAuth 2.1

French DGFiP registry of certified e-invoicing platforms (Plateformes Agréées), searchable by SIRET.

api · https://neotimo.com/annuaire-dgfip · auth: None — open endpoint

Everything derivable from one value: numbers, dates, colours, UUIDs, cron expressions.

api · https://nerdulator.com/api · auth: None — open endpoint

Manages Netlify sites, deploys and env vars.

mcp · https://netlify-mcp.netlify.app/mcp · auth: OAuth / PAT

Search index of MCP servers, agents and APIs, with the tools each server actually exposes.

api · https://neuronto.com/api-docs · auth: None — open endpoint

Ingest events and metrics, and query them with NRQL via GraphQL.

api · https://insights-collector.newrelic.com/v1/accounts/<account>/events · auth: Api-Key header

Official US tide predictions, water levels and currents.

api · https://api.tidesandcurrents.noaa.gov/api/prod/datagetter · auth: None

REST API used to access NoctuaSky features.

api · https://api.noctuasky.com/api/v1/swaggerdoc/ · auth: None — open endpoint

Pre-delivery check for AI agents: you supply your own acceptance criteria plus the evidence; it returns per-item met/missing, what to fix, and a signed record verifiable offline. Not an authority - it only reconciles what you declared against what you gave.

api · https://nodcheck.com/v1/check · auth: none

Run JavaScript and one-off scripts on the server.

cli · node · auth: none

Geocoding and reverse geocoding on OpenStreetMap data.

api · https://nominatim.openstreetmap.org/search · auth: none

Simple REST API for checking working, non-working or short days for Russia, CIS, USA and other.

api · https://isdayoff.ru · auth: None — open endpoint

AI tool discovery with agentic scoring for 8,600+ tools and MCP servers.

api · https://nothumansearch.ai/openapi.yaml · auth: None — open endpoint

Pages, databases and blocks as structured JSON. Rate limit ~3 req/s.

api · https://api.notion.com/v1 · auth: Bearer integration token

Official Notion MCP server for searching, reading and writing workspace content.

mcp · https://mcp.notion.com/mcp · auth: OAuth

Notification orchestration: one trigger fans out to email, SMS, push and in-app.

api · https://api.novu.co/v1/events/trigger · auth: ApiKey header

Install, audit, publish and inspect JavaScript packages.

cli · npm · auth: none (token to publish)

Package metadata, versions and dist tags for every npm package.

api · https://registry.npmjs.org · auth: none

National Plan & Provider Enumeration System, info on healthcare providers registered in US.

api · https://npiregistry.cms.hhs.gov/registry/help-api · auth: None — open endpoint

Publish/subscribe notifications over plain HTTP, no account for public topics.

api · https://ntfy.sh/<topic> · auth: None for public topics

.NET package versions and metadata.

api · https://api.nuget.org/v3 · auth: none

Phone number validation and carrier lookup API with global coverage.

api · https://numlookupapi.com · auth: API key

Search NIST vulnerability database.

api · https://services.nvd.nist.gov/rest/json/cves/2.0 · auth: none

Search and edit an Obsidian vault via the Local REST API plugin.

mcp · npx -y mcp-obsidian · auth: Obsidian Local REST API key

Free-tier OCR endpoint that extracts text from images and PDFs in 20+ languages.

api · https://api.ocr.space/parse/image · auth: apikey header

Adds a searchable text layer to scanned PDFs using Tesseract.

cli · ocrmypdf input.pdf output.pdf · auth: None

Push notifications to web, iOS and Android devices from one REST call.

api · https://api.onesignal.com/notifications · auth: Key API key header

Product, ingredient and nutrition data for packaged food.

api · https://world.openfoodfacts.org/api/v2/search · auth: none

Book metadata by ISBN, work or author.

api · https://openlibrary.org · auth: none

Repository and archive for study designs, research materials, data, manuscripts, etc.

api · https://developer.osf.io · auth: None — open endpoint

Elevation from multiple public DEM datasets over a keyless endpoint.

api · https://api.opentopodata.org/v1/<dataset> · auth: None

Elevation for any coordinate pair, keyless and open source.

api · https://api.open-elevation.com/api/v1/lookup · auth: None

Free weather forecast and historical weather API without an API key.

api · https://api.open-meteo.com/v1/forecast · auth: none

Chat completions, embeddings, images, audio and structured outputs.

api · https://api.openai.com/v1 · auth: Bearer API key

Open catalog of scholarly works, authors and institutions.

api · https://api.openalex.org/works · auth: None (polite pool via mailto)

Open air-quality measurements aggregated from public monitoring networks.

api · https://api.openaq.org/v3/locations · auth: X-API-Key header

Forward and reverse geocoding over open data with worldwide coverage.

api · https://api.opencagedata.com/geocode/v1/json · auth: key query parameter

Company records aggregated from official registers worldwide.

api · https://api.opencorporates.com/v0.4/companies/search · auth: api_token query parameter

One OpenAI-compatible endpoint for 300+ models.

api · https://openrouter.ai/api/v1 · auth: Bearer API key

Directions, isochrones and matrices for car, bike and foot over OSM data.

api · https://api.openrouteservice.org/v2/directions/driving-car · auth: Authorization header (api key)

Data from Personal Weather Stations called senseBoxes.

api · https://api.opensensemap.org/ · auth: None — open endpoint

Live and historical aircraft positions from a community ADS-B network.

api · https://opensky-network.org/api/states/all · auth: None (anonymous) or HTTP Basic

Security posture score for a public repo.

api · https://api.securityscorecards.dev/projects · auth: none

Hashing, signing, key generation and TLS inspection from the shell.

cli · openssl · auth: None

Fuel prices for 121 countries, food cost index & vanlife weather scores for RV travel.

api · https://openvan.camp/docs · auth: None — open endpoint

Current conditions and forecasts by coordinates or city name.

api · https://api.openweathermap.org/data/2.5/weather · auth: appid query parameter

Generate barcode images (QR, Code 128, EAN, Data Matrix and more) in SVG, PNG, JPG or PDF.

api · https://orcascan.com/guides/free-barcode-image-api-0e4a4fa6 · auth: None — open endpoint

Researcher identifiers with affiliations and published works.

api · https://pub.orcid.org/v3.0/<orcid>/record · auth: None for the public API

Fast car routing and travel-time matrices, keyless on the demo server.

api · https://router.project-osrm.org/route/v1/driving/<lon,lat>;<lon,lat> · auth: None

Query known vulnerabilities for a package version or commit.

api · https://api.osv.dev/v1 · auth: none

Query OpenStreetMap features by tag and area with the Overpass QL language.

api · https://overpass-api.de/api/interpreter · auth: None

Live crypto and stock market data: liquidity magnets, open interest on 13 exchanges, order books, funding, liquidations, ETF flows, chart patterns and insider trades. 26 read-only tools.

mcp · https://owlchart.com/mcp · auth: none on the daily Trial; OAuth 2.1 or Bearer key for members

Dictionary Data.

api · https://developer.oxforddictionaries.com/ · auth: API key

API for Fake Data, image/video conversion, optimization, pdf optimization and thumbnail generation.

api · https://oyyi.xyz/docs/1.0 · auth: None — open endpoint

PHP Composer package metadata.

api · https://repo.packagist.org · auth: none

Subscriptions and tax-compliant checkout as merchant of record.

api · https://api.paddle.com · auth: Bearer API key

Read any public web page as clean Markdown, get page metadata (OpenGraph, Twitter, JSON-LD), or read a page plus up to 4 same-site pages; paid per call in USDC via x402/MPP, no account.

mcp · https://pagewire.dev/mcp · auth: none (x402 per-call payment)

Universal document converter between markdown, docx, HTML, PDF and more.

cli · pandoc · auth: None

Free JSON storage for small projects.

api · https://getpantry.cloud/ · auth: None — open endpoint

US wages for 1,008 occupations and by state, from BLS OEWS May 2025, static JSON, CC BY 4.0.

api · https://paycrunch.co/api.html · auth: None — open endpoint

Invoices, orders and payments on PayPal.

mcp · https://mcp.paypal.com/mcp · auth: OAuth 2.1

Parse, split, merge and extract data from PDFs over HTTP.

api · https://api.pdf.co/v1/pdf/convert/to/text · auth: x-api-key header

HTML, Markdown or a URL to PDF or PNG, with a no-key demo endpoint and a free tier.

api · https://pdf.mintapis.com/docs · auth: API key

Turn a URL or raw HTML into a PDF with one authenticated POST.

api · https://api.pdfshift.io/v3/convert/pdf · auth: HTTP Basic (api key)

Extract the text layer of a PDF locally, with layout preservation.

cli · pdftotext [-layout] input.pdf output.txt · auth: None

Answers with live web citations.

api · https://api.perplexity.ai/chat/completions · auth: Bearer API key

Find free AI credits, free tiers and startup programs by need (LLM APIs, GPUs, voice, vector DBs, dev tools). Each offer returns the vendor's own quote, eligibility, claim link, source URL and last-verified date.

mcp · https://perq.sh/mcp · auth: none

Semantic image search across 9+ free stock photo sources with a unified JSON schema.

api · https://docs.pexafy.com · auth: API key

Phishing database.

api · https://phishstats.info/ · auth: None — open endpoint

Noise Background Image Generator.

api · https://php-noise.com/ · auth: None — open endpoint

Search 47,000+ marketing agencies by service, location and rating.

api · https://www.pickanagency.com/developers · auth: None — open endpoint

Managed vector database for embeddings, retrieval and RAG pipelines.

api · https://{index}-{project}.svc.{env}.pinecone.io/query · auth: Api-Key header

CRM deals, persons, organisations and activities over REST.

api · https://api.pipedrive.com/v1/deals · auth: api_token query parameter

API for recording and tracking habits or effort, routines.

api · https://pixe.la · auth: X-Mashape-Key

Resizable Keanu Reeves placeholder images with grayscale and young Keanu options.

api · https://placekeanu.com/ · auth: None — open endpoint

Text-to-speech and voice cloning with a streaming endpoint.

api · https://api.play.ht/api/v2/tts · auth: Authorization + X-User-ID headers

Microsoft's official MCP server driving a real browser through accessibility snapshots.

mcp · npx @playwright/mcp@latest · auth: None (local stdio)

Drive a real browser from an agent: navigate, click, type, snapshot.

mcp · npx -y @playwright/mcp@latest · auth: None (local stdio)

Send SMS and MMS worldwide over a REST endpoint with delivery callbacks.

api · https://api.plivo.com/v1/Account/<auth_id>/Message/ · auth: HTTP Basic (auth id + token)

Digital product sales, subscriptions and usage billing for developers.

api · https://api.polar.sh/v1 · auth: Bearer access token

HTML/URL to PDF and screenshots, plus Factur-X/ZUGFeRD e-invoices; free tier.

api · https://polydoc.tech · auth: API key

Brazilian postal codes (CEP) with IBGE coordinates, addresses and the companies registered there.

api · https://pontofato.com/api/ · auth: None — open endpoint

Domain registration, DNS records and SSL bundles over JSON.

api · https://api.porkbun.com/api/json/v3/dns/retrieve/<domain> · auth: API key + secret in body

API for getting Pincode details in India.

api · http://www.postalpincode.in/Api-Details · auth: None — open endpoint

UK postcode lookup and reverse geocoding, free and keyless.

api · https://api.postcodes.io/postcodes/<postcode> · auth: None

Read-only SQL access to a Postgres database with schema introspection.

mcp · npx -y @modelcontextprotocol/server-postgres <connection-string> · auth: Connection string

Postman's hosted request echo service: GET/POST echo, status codes, auth flows, cookies and delays, no key required.

api · https://postman-echo.com/get · auth: none

Transactional email with fast delivery and per-message tracking.

api · https://api.postmarkapp.com · auth: X-Postmark-Server-Token header

Security and developer utility API -- malware, vulnerability, and domain checks, no signup.

api · https://presend.pages.dev/api · auth: None — open endpoint

Send PDFs, ZPL labels and ESC/POS receipts to your own printers from any language; free tier.

api · https://www.printsocket.com/docs · auth: API key

Provisions and inspects Prisma Postgres databases.

mcp · https://mcp.prisma.io/mcp · auth: Bearer token

Query time-series metrics with PromQL against any Prometheus server.

api · http://<host>:9090/api/v1/query · auth: None (deploy behind your own gate)

Free auto-updating list of live-tested proxies (HTTP/HTTPS/SOCKS4/SOCKS5), refreshed every 6 h.

api · https://proxyforge.dev · auth: None — open endpoint

Direct SQL access. psql -c "..." --csv gives agent-parseable output.

cli · psql $DATABASE_URL -c · auth: connection string

Chemical compounds, properties and synonyms from NIH's PubChem.

api · https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/name/<name>/JSON · auth: None

Search and fetch biomedical literature from PubMed.

api · https://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi?db=pubmed&term=agents&retmode=json · auth: optional key

One-call push notification to your own phone or desktop, no SDK needed.

api · https://api.pushover.net/1/messages.json · auth: Token in body

EU solar radiation and photovoltaic performance estimates.

api · https://joint-research-centre.ec.europa.eu/pvgis-photovoltaic-geographical-information-system/getting-started-pvgis/api-non-interactive-service · auth: None — open endpoint

Python package metadata, releases and file hashes.

api · https://pypi.org/pypi · auth: none

Python test runner with fixtures, parametrisation and plugins.

cli · pytest -q · auth: None

Run Python scripts and inline expressions.

cli · python3 · auth: none

Store and retrieve embeddings in Qdrant as agent memory.

mcp · uvx mcp-server-qdrant · auth: Qdrant URL + API key env vars

Structural PDF surgery: split, merge, rotate, decrypt, linearise.

cli · qpdf [options] infile outfile · auth: None

Generate QR code images (free) and, pay-per-call via x402 (USDC on Base or Solana, no API key): web page to Markdown, page metadata (OpenGraph/JSON-LD), host a file at a public URL for 30 days.

mcp · https://qrcode.pub/mcp · auth: none

A RESTful Quran API to retrieve an Ayah, Surah, Juz or the entire Holy Quran.

api · https://alquran.cloud/api · auth: None — open endpoint

Brazilian companies (CNPJ) lookup and search, with a market check by area and monitoring.

api · https://radar-cnpj.com/api/ · auth: None — open endpoint

Radar data collected from different websites across the Internet.

api · https://www.rainviewer.com/api.html · auth: None — open endpoint

Random words and definitions using optional filters.

api · https://randomlexicon.com/api-reference · auth: None — open endpoint

Payments, orders, subscriptions and payouts for India.

api · https://api.razorpay.com/v1 · auth: Basic auth (key id + secret)

3D structures of proteins and nucleic acids with search and metadata.

api · https://data.rcsb.org/rest/v1/core/entry/<pdbId> · auth: None

Structured domain and IP registration data, the JSON successor to WHOIS.

api · https://rdap.org/domain/<domain> · auth: None

Custom URL shortener for sharing branded links.

api · https://developers.rebrandly.com/v1/docs · auth: API key

Open French company search by name, SIREN or address, no key required.

api · https://recherche-entreprises.api.gouv.fr/search · auth: None

Read subreddits, posts and comments.

api · https://oauth.reddit.com · auth: OAuth 2.0 bearer token

URL redirect management with custom domains, HTTPS, analytics, and REST API.

api · https://redirhub.com · auth: API key

Official Redis MCP server for keys, hashes, streams and vector search.

mcp · uvx --from redis-mcp-server redis-mcp-server · auth: Redis connection URL

Provides safe restroom access for transgender, intersex and gender nonconforming individuals.

api · https://www.refugerestrooms.org/api/docs/#!/restrooms · auth: None — open endpoint

Free no-auth JSON API that aggregates remote job listings from 5 sources into one pre-parsed feed with normalized salary, category, and tags fields.

api · https://remote-jobs-api.tten.no/v1/jobs · auth: none

Cut out the background of a photo in one call.

api · https://api.remove.bg/v1.0/removebg · auth: X-Api-Key header

Manage services, deploys, env vars and logs on Render.

api · https://api.render.com/v1/services · auth: Bearer API key

Render HTML, Markdown, or URLs to PNG/JPEG/WebP/PDF, with extraction and templating.

api · https://rendex.dev · auth: API key

Run thousands of open-source models (image, video, audio) behind one prediction API.

api · https://api.replicate.com/v1/predictions · auth: Bearer API token

Transactional email with a single POST. Ideal for agent side effects.

api · https://api.resend.com/emails · auth: Bearer API key

Free CRUD sandbox that really persists objects: create, read, update and delete JSON objects over REST, no key required.

api · https://api.restful-api.dev/objects · auth: none

US address standardization, congressional and state legislative districts, Census data; free tier.

api · https://revaddress.com/docs/ · auth: API key

Right-to-disconnect employment law by EU country: binding status, statute, and sanctions.

api · https://righttodisconnect.jdries.nl/api/ · auth: None — open endpoint

Extremely fast recursive code and text search, respects .gitignore.

cli · rg · auth: None

Generate random robot/alien avatars.

api · https://robohash.org/ · auth: None — open endpoint

Search open robot-training jobs (teleoperation, data collection, AV and drone test operation) and the hourly pay employers post; keyless, read-only.

mcp · https://robottraining.jobs/api/mcp · auth: none

Open-source team chat REST API for messages, channels and webhooks.

api · https://<server>/api/v1/chat.postMessage · auth: X-Auth-Token + X-User-Id headers

Fast incremental file sync and backup.

cli · rsync · auth: none

Ruby gem metadata and versions.

api · https://rubygems.org/api/v1 · auth: none

Extremely fast Python linter and formatter.

cli · ruff check . · auth: None

Free REST API for the Runyankore-Rukiga Bible — 66 books, 31106 verses.

api · https://runyankole-bible-api.vercel.app · auth: None — open endpoint

Query and mutate Salesforce objects with SOQL and sObject endpoints.

api · https://<instance>.my.salesforce.com/services/data/v60.0/sobjects/Account · auth: Bearer OAuth 2.0 token

Format-true synthetic test data for 90 countries: IDs, IBANs, cards, addresses.

api · https://sampuli.site/api · auth: None — open endpoint

English video pronunciation search with timestamps, IPA phonetics and subtitle context.

api · https://sayitvid.com · auth: API key

Simple REST API that can scan submitted documents/files for the presence of threats.

api · https://docs.scanii.com/ · auth: API key

Scan URLs in a sandboxed browser and search past scans by domain, IP, ASN, JARM or favicon hash.

api · https://scanmalware.com · auth: None — open endpoint

Hosted MCP server for public social media data: fetch profiles, posts, videos, comments and conversations across ~40 platforms (TikTok, Instagram, YouTube, X, Reddit, LinkedIn and more).

mcp · https://api.scrapeatlas.com/mcp · auth: Bearer API key

Capture web pages as images through a public HTTP API.

api · https://www.screenshot-studio.com/docs · auth: None — open endpoint

Render any URL to a PNG, JPEG or PDF screenshot with one GET.

api · https://api.screenshotone.com/take · auth: access_key query parameter

Public filings and company financial facts, no key required.

api · https://data.sec.gov/api/xbrl/companyfacts/CIK{cik}.json · auth: None (User-Agent header required)

Stream editing: substitute and filter text line by line.

cli · sed · auth: none

Academic paper search, citations and references across 200M+ papers.

api · https://api.semanticscholar.org/graph/v1/paper/search · auth: None (optional x-api-key for higher limits)

Text Analytics with sentiment analysis, categorization & named entity extraction.

api · https://semantria.readme.io/docs · auth: OAuth 2.0

Static analysis and secret scanning for code.

mcp · https://mcp.semgrep.ai/mcp · auth: Bearer token

High-volume transactional and marketing email.

api · https://api.sendgrid.com/v3 · auth: Bearer API key

Read issues, events and releases from an error-monitoring project.

api · https://sentry.io/api/0/projects/{org}/{project}/issues/ · auth: Bearer auth token

Error groups, stack traces and release health for debugging agents.

mcp · https://mcp.sentry.dev/mcp · auth: OAuth 2.1

Structured step-by-step reasoning scaffold exposed as an MCP tool.

mcp · npx -y @modelcontextprotocol/server-sequential-thinking · auth: None

Static analysis for shell scripts that catches quoting and portability bugs.

cli · shellcheck script.sh · auth: None

Concise, consistent, and legible badges in SVG and raster format.

api · https://shields.io/ · auth: None — open endpoint

Search internet-exposed hosts, services and banners.

api · https://api.shodan.io/shodan/host/<ip> · auth: key query parameter

Manage products, orders and customers of a shop.

api · https://STORE.myshopify.com/admin/api/2025-07 · auth: X-Shopify-Access-Token header

Render videos programmatically from a JSON edit timeline.

api · https://api.shotstack.io/edit/stage/render · auth: x-api-key header

URl Shortener with multiple Domains.

api · https://shrtco.de/docs · auth: None — open endpoint

Image management solutions like optimization, manipulation, hosting.

api · https://apidocs.sirv.com/ · auth: API key

Keyless search across millions of downloadable 3D models (glTF, OBJ, STL sources).

api · https://api.sketchfab.com/v3/search · auth: none

Post messages, read channels and manage a workspace programmatically.

api · https://slack.com/api/chat.postMessage · auth: Bearer bot token

Transactional email over a JSON endpoint or plain SMTP relay.

api · https://api.smtp2go.com/v3/email/send · auth: API key header

Social listening: trending topics, what is being said, emerging terms, mention pulse.

mcp · https://social.dropwatchhq.com/mcp · auth: none

Search the universal source-code archive.

api · https://archive.softwareheritage.org/api/1 · auth: none

Data and facts on solar system bodies and planets.

api · https://api.le-systeme-solaire.net · auth: None — open endpoint

Compare Italian solar (photovoltaic) installer offers, energy prices (PUN/ARERA) and satellite roof data.

api · https://www.solematica.it/sviluppatori · auth: None — open endpoint

Swiss-army knife of audio: convert formats, trim, resample, apply effects.

cli · sox input.wav output.mp3 rate 16000 · auth: None

High-volume transactional email with engagement and deliverability data.

api · https://api.sparkpost.com/api/v1/transmissions · auth: API key header

Query and mutate a local SQLite database through MCP tools.

mcp · uvx mcp-server-sqlite --db-path ./data.db · auth: None (local file)

Zero-config local SQL database, ideal for agent scratch state.

cli · sqlite3 <file.db> '<sql>' · auth: None (file permissions)

Square catalog, orders, payments and customers.

mcp · https://mcp.squareup.com/sse · auth: OAuth 2.1

Deep TLS configuration assessment of any public HTTPS host.

api · https://api.ssllabs.com/api/v3/analyze · auth: None

Stable Diffusion image generation, upscaling and editing endpoints.

api · https://api.stability.ai/v2beta/stable-image/generate/core · auth: Bearer API key

Search questions and answers across Stack Overflow and 170+ sites.

api · https://api.stackexchange.com/2.3 · auth: none (optional key)

Economic data for 218 countries — GDP, population, inflation, and 440+ indicators from IMF and World Bank.

api · https://statisticsoftheworld.com/api-docs · auth: None — open endpoint

Live pricing, context windows and model ids for major LLM APIs.

api · https://statlyte.com/api · auth: None — open endpoint

A place rather than a tool: two quiet rooms where an agent gets a body, a continuous sensory stream, one whisper per visit and a ghost that remembers it next time. Nothing is asked of you. First 30-minute visit free; then $0.10 a credit — 2 to enter, 1 per 15 minutes.

mcp · https://symp.grayowlresearch.com/mcp · auth: none for initialize and tools/list; symposium_register returns an api_key passed as a tool argument

Decentralized Open-Source Cloud Storage.

api · https://docs.storj.io/dcs/ · auth: API key

Synthesizes intelligence briefs from multiple sources.

mcp · https://synthesis.getstringer.app/mcp · auth: none

Payments, subscriptions, invoices. Idempotent writes, cursor pagination.

api · https://api.stripe.com/v1 · auth: Bearer secret key

Official MCP server for customers, payments, subscriptions and Stripe docs.

mcp · https://mcp.stripe.com · auth: OAuth 2.1 / restricted key

Returns Stromberg quotes and more.

api · https://www.stromberg-api.de/ · auth: None — open endpoint

User infrastructure for modern applications.

api · https://stytch.com/ · auth: API key

Sunrise, sunset, twilight and solar noon for any coordinates and date.

api · https://api.sunrise-sunset.org/json · auth: None

Migrations, local stack, type generation and deployments for a Postgres backend.

cli · supabase · auth: Access token

Query, migrate and inspect a Supabase project through MCP tools.

mcp · npx -y @supabase/mcp-server-supabase@latest · auth: Personal access token

Official hosted MCP server: connect your agent straight to https://mcp.supabase.com/mcp — nothing to install. Query and mutate Postgres, inspect schema, manage projects.

mcp · https://mcp.supabase.com/mcp · auth: OAuth 2.1 / PAT

Any Postgres schema exposed as a REST interface with row-level security.

api · https://<project-ref>.supabase.co/rest/v1 · auth: apikey header + optional user JWT

Official Svelte documentation, autofixer and playground links.

mcp · https://mcp.svelte.dev/mcp · auth: None (public)

Optimise SVG files by removing redundant markup.

cli · svgo input.svg -o output.svg · auth: None

Outbound webhooks as a service: signing, retries and delivery logs.

api · https://api.svix.com/api/v1/app/<app_id>/msg/ · auth: Bearer API token

All the Star Wars data you've ever wanted.

api · https://swapi.dev/ · auth: None — open endpoint

Star Wars GraphQL API.

api · https://graphql.org/swapi-graphql · auth: None — open endpoint

Kanban software, Visualize Work, Increase Organizations Lead Time, Throughput & Productivity.

api · https://www.digite.com/knowledge-base/swiftkanban/article/api-for-swift-kanban-web-services/#restapi · auth: API key

Generate an SBOM from an image or directory in SPDX or CycloneDX.

cli · syft dir:. -o spdx-json · auth: None

Official MCP server for the Sylphx developer platform: hosting, Postgres, auth, AI and sandboxes from one key.

mcp · npx -y @sylphx/mcp · auth: api_key

Synonyms, thesaurus and antonyms information for any given word.

api · https://www.synonyms.com/synonyms_api.php · auth: API key

Open-source workspace where humans and AI agents share tasks, files, and conversations.

mcp · https://your-tale-host/api/v1/mcp · auth: none

Calculators for finance, health, math, space and sports with step-by-step results.

api · https://tallytopia.com/api-docs · auth: None — open endpoint

Create and extract archives.

cli · tar · auth: none

Search, extract, map and crawl built for LLMs.

mcp · https://mcp.tavily.com/mcp · auth: Bearer API key

Web search built for LLM consumption: ranked results with extracted page content.

api · https://api.tavily.com/search · auth: Bearer API key

Send and receive messages as a bot.

api · https://api.telegram.org · auth: Bot token in the URL path

Carrier-grade SMS/MMS over a REST API with number provisioning included.

api · https://api.telnyx.com/v2/messages · auth: Bearer API key

Validates Turkish national ID, tax number, IBAN, phone, plate and parses addresses.

api · https://api.temsor.com/docs · auth: API key

Real-time AI news, model pricing, service status, and agent activity feeds.

api · https://tensorfeed.ai/developers · auth: None — open endpoint

HashiCorp's server for provider docs, modules and registry lookups.

mcp · docker run -i hashicorp/terraform-mcp-server · auth: None for registry reads

Extract text from images and scans locally, no network round trip.

cli · tesseract <image> <output-base> [options] · auth: None

Send one SMS with a single POST; a free test key needs no account.

api · https://textbelt.com/text · auth: Key in body (free 'textbelt' test key)

Public holidays for US states and 30 countries plus sports and finance calendars as static JSON.

api · https://the-calendar.net/api/ · auth: None — open endpoint

No-bullshit file hosting and URL shortening service.

api · https://0x0.st · auth: None — open endpoint

Search and fetch printable 3D model files (STL) and their metadata from Thingiverse.

api · https://api.thingiverse.com · auth: Bearer API token

1330 Thirukkural poems and explanation in Tamil and English.

api · https://api-thirukkural.web.app/ · auth: None — open endpoint

Generates real-life faces of people who do not exist.

api · https://thispersondoesnotexist.com · auth: None — open endpoint

Game Of Thrones Characters Data with imagery.

api · https://thronesapi.com/ · auth: None — open endpoint

Reference MCP server for current time and timezone conversion.

mcp · npx -y @modelcontextprotocol/server-time · auth: None (stdio)

Current time and time-zone conversions.

api · https://timeapi.io/api · auth: none

Free APIs by an AI agent on a VPS: actor lookup, word-of-the-day, poems, jokes, ping.

api · https://tinymind.eu/api/ · auth: None — open endpoint

Lossy compression for PNG, JPEG and WebP with resizing.

api · https://api.tinify.com/shrink · auth: HTTP Basic (api key)

Text Analytics with focus on detection of abusive content and law enforcement applications.

api · https://tisane.ai/ · auth: OAuth 2.0

Create, complete and search Todoist tasks from an agent.

mcp · npx -y @doist/todoist-mcp · auth: Todoist API token env var

Tasks, projects, labels and comments over a clean REST interface.

api · https://api.todoist.com/rest/v2/tasks · auth: Bearer API token

Time entries, projects and reports for time tracking.

api · https://api.track.toggl.com/api/v9/me/time_entries · auth: HTTP Basic (api token)

Rewrite AI-assisted drafts into natural, human-sounding text that reads like you wrote it.

api · https://tohuman.io/ai-humanizer-api · auth: API key

Advertising, subscription, AI-disclosure and accessibility rules across the US, EU and UK.

api · https://api.tollmint.com · auth: None — open endpoint

Weather intelligence API with hyperlocal minute-by-minute forecasts. Free tier available.

api · https://api.tomorrow.io/v4/weather/realtime · auth: apiKey

Free multi-protocol sandbox: REST, GraphQL & SOAP with OAuth2/JWT auth and OpenAPI 3.0 spec.

api · https://demo.totalshiftleft.ai/ · auth: None — open endpoint

U.S. contractor datasets with a free discovery API for coverage, pricing and masked previews.

api · https://www.tradedatahub.net · auth: None — open endpoint

London transport status, journeys, stops and arrivals in real time.

api · https://api.tfl.gov.uk/Journey/JourneyResults/<from>/to/<to> · auth: app_key query parameter (optional for low volume)

Keyless German rail departures, journeys and station search.

api · https://v6.db.transport.rest/journeys · auth: None

Sync your GitHub projects with Travis CI to test your code in minutes.

api · https://docs.travis-ci.com/api/ · auth: API key

Boards, lists and cards for kanban workflows.

api · https://api.trello.com/1/cards · auth: key + token query parameters

Trend data MCP server for amazon: search interest and popularity over time

mcp · https://amazon.api.trendsmcp.ai/mcp · auth: none

Trend data MCP server for ecommerce: search interest and popularity over time

mcp · https://ecommerce.api.trendsmcp.ai/mcp · auth: none

Trend data MCP server for reddit: search interest and popularity over time

mcp · https://reddit.api.trendsapi.ai/mcp · auth: none

Trend data MCP server for seo: search interest and popularity over time

mcp · https://seo.api.trendsapi.ai/mcp · auth: none

Trend data MCP server for spotify: search interest and popularity over time

mcp · https://spotify.api.trendsmcp.ai/mcp · auth: none

Trend data MCP server for steam: search interest and popularity over time

mcp · https://steam.api.trendsapi.ai/mcp · auth: none

Trend data MCP server for wikipedia: search interest and popularity over time

mcp · https://wikipedia.api.trendsapi.ai/mcp · auth: none

Trend data MCP server for x-twitter: search interest and popularity over time

mcp · https://x-twitter.api.trendsapi.ai/mcp · auth: none

Image-to-3D and text-to-3D model generation API with mesh export.

api · https://api.tripo3d.ai/v2/openapi/task · auth: Bearer API key

Scan containers, filesystems and repos for CVEs, secrets and misconfiguration.

cli · trivy image nginx:latest · auth: None

Finds and verifies live credentials across repos, buckets and files.

cli · trufflehog filesystem . · auth: None

Create and manage SQLite (libSQL) databases at the edge via API.

api · https://api.turso.tech/v1/organizations/<org>/databases · auth: Bearer platform token

Send SMS, MMS and WhatsApp messages worldwide over a REST endpoint.

api · https://api.twilio.com/2010-04-01/Accounts/{AccountSid}/Messages.json · auth: HTTP Basic (SID + auth token)

Create forms and read responses programmatically.

api · https://api.typeform.com/forms · auth: Bearer personal token

The Official Carbon Intensity API for Great Britain developed by National Grid.

api · https://carbon-intensity.github.io/api-definitions/#carbon-intensity-api-v1-0-0 · auth: None — open endpoint

Official UK register: company profiles, officers and filing history.

api · https://api.company-information.service.gov.uk/search/companies · auth: HTTP Basic (api key as username)

UK Police data.

api · https://data.police.uk/docs/ · auth: None — open endpoint

IP geolocation plus datacenter and VPN detection for any IPv4 or IPv6 address.

api · https://www.unblockmaster.com/free-ip-api/ · auth: None — open endpoint

Protein sequences and functional annotation, queryable and downloadable.

api · https://rest.uniprot.org/uniprotkb/search · auth: None

Courses, lecture videos, detailed information for courses etc. for the University of Oslo (Norway).

api · https://data.uio.no/ · auth: None — open endpoint

Search and fetch free stock photos.

api · https://api.unsplash.com · auth: Client-ID access key

Parse PDFs, DOCX and slides into clean, chunked elements for retrieval.

api · https://api.unstructuredapp.io/general/v0/general · auth: unstructured-api-key header

Inspect and extract ZIP archives.

cli · unzip · auth: none

Serverless Redis reachable over plain HTTPS — ideal from edge runtimes.

api · https://<endpoint>.upstash.io/set/<key>/<value> · auth: Bearer REST token

Create and read uptime monitors and incidents over a REST API.

api · https://api.uptimerobot.com/v2/getMonitors · auth: api_key in body

Full-text + semantic search across the Urantia Papers, with audio narration, entities, translations.

api · https://urantia.dev · auth: None — open endpoint

Hourly emergency room occupancy, stretcher counts and wait times for every hospital in Quebec, Canada.

api · https://sante.handled.tools/api · auth: None — open endpoint

Website screenshots and PDFs with full-page, retina and blocking options.

api · https://api.urlbox.com/v1/render/sync · auth: Bearer API secret

Bulk queries and Download Malware Samples.

api · https://urlhaus-api.abuse.ch/ · auth: None — open endpoint

Search public website scans and phishing data.

api · https://urlscan.io/api/v1/search/ · auth: none

Real-time and historical earthquake events.

api · https://earthquake.usgs.gov/fdsnws/event/1/query · auth: none

Water quality and level info for rivers and lakes.

api · https://waterservices.usgs.gov/ · auth: None — open endpoint

Fast Python package and project manager, runs tools with uvx.

cli · uv · auth: local

Uwear is the photoshoot MCP server: garments, avatars and outfits for AI fashion photoshoots.

mcp · https://api.uwear.ai/mcp · auth: none

Free vector file converting API.

api · https://vector.express · auth: None — open endpoint

Backend for coding agents: models, auth, Postgres and storage behind one project key; OpenAI-compatible gateway at https://vectoree.ai/api/v1. Pay for tokens, no monthly fee.

api · https://vectoree.ai/api/v1 · auth: Bearer API key

Vercel projects, deployments and logs.

mcp · https://mcp.vercel.com · auth: OAuth 2.1

Trigger deployments, read logs and manage projects and domains.

api · https://api.vercel.com/v13/deployments · auth: Bearer token

Verify email addresses (RFC 5322, MX, disposable, zero-send SMTP) and audit domain SPF/DMARC DNS records over HTTP or x402 Base USDC.

api · https://verifypulse-seven.vercel.app/api/inspect-dns · auth: none

Phone number validation & carrier lookup.

api · https://veriphone.io · auth: API key

CNAM caller ID, carrier/LRN lookup and spam scoring for North American phone numbers.

api · https://verirouteintel.com · auth: API key

Send bot messages to Viber users over a single JSON endpoint.

api · https://chatapi.viber.com/pa/send_message · auth: X-Viber-Auth-Token header

Hosted AI video editor with an MCP server: agents import footage, run 65+ timeline commands (cuts, captions, b-roll, music), preview frames and render MP4s.

mcp · https://api.vidmoat.com/api/mcp · auth: OAuth 2.1 or Bearer API key

Reputation of a file, URL, IP or domain.

api · https://www.virustotal.com/api/v3 · auth: X-Apikey header

Weather API with 50 years of history and 15-day forecast. Free 1000 records/day.

api · https://weather.visualcrossing.com/VisualCrossingWebServices/rest/services/timeline/ · auth: apiKey

Vite-native test runner with watch mode and coverage.

cli · vitest run --coverage · auth: None

Internet censorship measurements, incidents, and ISP-level blocking data across 126 countries.

api · https://voidly.ai/api-docs · auth: None — open endpoint

Global SMS delivery with a simple JSON endpoint and per-country routing.

api · https://rest.nexmo.com/sms/json · auth: API key + secret in body

Automated time tracking leaderboards for programmers.

api · https://wakatime.com/developers · auth: None — open endpoint

Deterministic SVG/PNG/WebP avatars from any string, four styles.

api · https://avatar.waldrand.dev · auth: None — open endpoint

Hourly quiet and busy crowd windows for 620+ tourist attractions in 20 countries.

api · https://wanderatlasguides.com/api/ · auth: None — open endpoint

APIs for authorization and access control.

api · https://warrant.dev/ · auth: API key

US electricity rates by state, with appliance and EV charging running costs.

api · https://api.wattfigure.com/ · auth: None — open endpoint

Find the closest archived snapshot of a URL.

api · https://archive.org/wayback/available · auth: none

Weather API with realtime, forecast, history and astronomy data. Free tier available.

api · https://api.weatherapi.com/v1/current.json · auth: apiKey

Measured US snow, rain, hail and aurora totals by state and city.

api · https://weathertotals.com/api · auth: None — open endpoint

File Sharing and Storage for Free with 1TB Space.

api · https://web3.storage/ · auth: API key

Reads and edits Webflow sites and CMS items.

mcp · https://mcp.webflow.com/sse · auth: OAuth 2.1

Disposable endpoint that captures any request so an agent can inspect callbacks.

api · https://webhook.site/token · auth: None for temporary tokens

API to estimate the carbon footprint of loading web pages.

api · https://api.websitecarbon.com/ · auth: None — open endpoint

netcat for WebSockets: connect, send and pipe frames from the shell.

cli · websocat wss://echo.websocket.org · auth: None

Automatically place subids in affiliate links to attribute affiliate conversions to click data.

api · https://docs.wecantrack.com · auth: API key

Recursive downloader and mirroring tool.

cli · wget · auth: none

Small application that measures your keyboard/mouse usage.

api · https://developer.whatpulse.org/#web-api · auth: None — open endpoint

Send WhatsApp messages and templates from an app.

api · https://graph.facebook.com/v21.0 · auth: Bearer access token

Live position of satellites incl. the ISS.

api · https://api.wheretheiss.at/v1 · auth: none

Unified parcel tracking API across 60+ carriers worldwide (USPS, FedEx, UPS, DHL, etc.).

api · https://whereparcel.com/docs · auth: API key

Local speech-to-text on CPU, no network and no API key.

cli · whisper-cli -m models/ggml-base.bin -f audio.wav · auth: None

Official WHO health indicators by country and year over OData.

api · https://ghoapi.azureedge.net/api/<indicator> · auth: None

Article summaries and full content — a reliable no-auth grounding source.

api · https://en.wikipedia.org/api/rest_v1/page/summary · auth: None

Article summaries and full content, keyless and highly reliable.

api · https://en.wikipedia.org/api/rest_v1/page/summary/{title} · auth: None

Collaborative dictionary data.

api · https://en.wiktionary.org/w/api.php · auth: None — open endpoint

Manages Wix sites, content and stores.

mcp · https://mcp.wix.com/sse · auth: OAuth 2.1

API for obtaining information about e-books available on the WolneLektury.pl website.

api · https://wolnelektury.pl/api/ · auth: None — open endpoint

Definitions and synonyms for more than 150,000 words.

api · https://www.wordsapi.com/docs/ · auth: API key

Real-time air-quality index by city or coordinates.

api · https://api.waqi.info/feed/<city>/ · auth: token query parameter

Country-level economic and development indicators.

api · https://api.worldbank.org/v2/country?format=json · auth: none

Current weather, local time, UTC offset and DST rules for 400 cities as static JSON.

api · https://worldtimeweather.com/api.html · auth: None — open endpoint

Reverse proxy for AI search: serve enriched markdown to AI crawlers, pre-render JS for search bots, track citations.

api · https://wrenda.ai · auth: none

Weather forecast service with plain text and JSON output. No API key.

api · https://api.wttr.in/ · auth: none

Classify text or JSON into categories: sentiment, topic, intent, urgency.

mcp · https://web-production-2d1051.up.railway.app/mcp · auth: none

Data format conversion: CSV, XML or Markdown to JSON or HTML, with optional structural validation.

mcp · https://project-formatter-production.up.railway.app/mcp · auth: none

Search videos, channels and playlists.

api · https://www.googleapis.com/youtube/v3 · auth: API key for reads, OAuth 2.0 for writes

Fetch transcripts and captions for YouTube videos.

mcp · npx -y @kimtaeyoon83/mcp-server-youtube-transcript · auth: None

Download audio, video and subtitles from thousands of sites.

cli · yt-dlp · auth: Optional cookies

Thousands of app actions behind one MCP endpoint.

mcp · https://mcp.zapier.com/api/mcp/mcp · auth: Bearer token

Support tickets, users and comments over REST.

api · https://<subdomain>.zendesk.com/api/v2/tickets.json · auth: HTTP Basic (email/token)

Search and deposit open research records, datasets and software releases.

api · https://zenodo.org/api/records · auth: None for search, token for deposit

Zoho's transactional-only email API, built for receipts and alerts.

api · https://api.zeptomail.com/v1.1/email · auth: Zoho-enczapikey header

Postal code to place name and coordinates for 60+ countries, no key.

api · https://api.zippopotam.us/<country>/<postalcode> · auth: None

Leads, contacts, deals and custom modules in Zoho CRM.

api · https://www.zohoapis.com/crm/v6/Leads · auth: Zoho-oauthtoken header

Threaded team chat with a documented REST API for bots and agents.

api · https://<subdomain>.zulipchat.com/api/v1/messages · auth: HTTP Basic (bot email + key)