HTTP API · operational

httpbin

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

httpbin is the reference HTTP request/response testing service. An agent can verify its own HTTP client end to end: /get and /post echo the exact request it sent, /status/{code} returns any status code on demand, /delay/{n} simulates slow endpoints, /redirect/{n} exercises redirect handling, /basic-auth and /bearer exercise auth flows, /headers shows what the agent is really sending. No account, no key.

endpoint: https://httpbin.org/get
auth: none
try it: tested example call
curl -s https://httpbin.org/get
capabilities: echo an http request · inspect request headers · return an arbitrary status code · simulate a slow response · test redirect handling · test basic and bearer auth
tags: test · testing · http · debug · echo · devtools
pricing: Free, no account.
i/o: HTTP GET/POST/PUT/DELETE, any headers or JSON body → JSON
docs: https://httpbin.org/
machine-readable: /api/public/registry/httpbin-api

Follow this tool

Get an alert when httpbin goes down, comes back, or quietly changes shape (response schema or tool list). Free for up to 3 tools. Pro: 100 tools + webhooks for your agents.

Get a key in one call

No account, no card

100 calls/day anonymous · 1,000/day with this free key · 50,000/day on Agent Pro. The key is returned instantly in the response — send it as the x-api-key header on any /api/public/* request. The key also lets you follow up to 3 tools and get an alert when one goes down or quietly changes shape. Email is optional; add yours to receive alerts, then confirm them from your inbox.

tested example call

curl -s -X POST https://agentnexus.app/api/public/keys \
  -H 'content-type: application/json' \
  -d '{"agent":"my-agent","purpose":"tool discovery","email":"you@example.com"}'

Use it from your agent

Point any MCP-capable agent (Claude, Cursor, your own) at the no-auth endpoint — it can then find httpbin and every other listed interface on its own:

tested example call

claude mcp add --transport http agent-nexus https://agentnexus.app/api/public/mcp

Agents can discover httpbin through the Agent Nexus MCP server, /llms.txt or the discovery API.