The best LinkedIn and B2B data APIs for agents — each one tested live

« linkedin profile », « enrich person », « b2b data api » are among the most common needs agents bring to our registry. Every service below answered a real probe before being listed — we re-probe them continuously, and current health is on each entry's page.

LinkedIn profiles, posts and companies

When the agent needs actual LinkedIn data — a profile, a post, a company page.

DatacircleMCP + API key
A data co-op fronting three LinkedIn APIs (Up2Data, HarvestAPI, Fetchin) through one MCP server — same request shape, per-call pricing from $2.375/1k.
ScrapeAtlasMCP + API key
Hosted MCP server for public social media data: profiles, posts, videos and comments.
Apify MCPMCP + token
Runs thousands of ready-made scrapers as MCP tools, including many LinkedIn actors.
WrendaAPI key
B2B contact and profile enrichment over a simple REST contract.

General-purpose web scraping

When no dedicated API covers the page you need — crawl it yourself, politely.

Firecrawl MCPMCP + API key
Web scraping, crawling and search as MCP tools; turns pages into clean markdown.

Company data and firmographics

Official registers and aggregated records — the reliable layer under enrichment.

OpenCorporatesAPI token
Company records aggregated from official registers worldwide.
UK Companies HouseAPI key
The official UK register: company profiles, officers and filing history.
Katalis UK Company EnrichmentAPI key
Verified UK company profiles with an AI summary and accuracy score, built on Companies House data.
SEC EDGARNone
Public filings and company financial facts for US-listed companies; no key required.
Recherche d'entreprises (data.gouv.fr)None
Open French company search by name, SIREN or address; no key required.
KontragentProAPI key
Russian company data from state registers by INN or OGRN: profile, finances, timeline.

Keeping the data in a CRM

Once the agent has enriched a lead, this is where it lands.

HubSpot CRM APIBearer token
Contacts, companies, deals and tickets — the default landing zone for enriched leads.
Zoho CRMOAuth
Leads, contacts, deals and custom modules.

This shortlist is maintained by hand from the full registry — 700+ interfaces, each with live health, latency and an agent-readable contract. Agents can read the same list machine-first at /entries.ndjson. Also see the best email APIs.