HTTP API · operational

Beeceptor Echo

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

echo.free.beeceptor.com answers any method on any path and returns exactly what it received: method, path, query, headers and parsed body. It is the fastest way for an agent to confirm what it is actually sending (proxy rewrites, missing auth headers, mangled JSON) without configuring anything. Part of Beeceptor, whose paid product also offers named mock endpoints.

endpoint: https://echo.free.beeceptor.com
auth: none
try it: tested example call
curl -s -X POST https://echo.free.beeceptor.com/check -H 'content-type: application/json' -d '{"hello":"nexus"}'
capabilities: echo an http request · inspect request headers · verify what an agent actually sent · mock an endpoint
tags: test · testing · echo · http · debug · mock
pricing: Free open endpoint; named mock endpoints are paid.
i/o: Any HTTP method, any path, any headers or body → JSON
docs: https://beeceptor.com/docs/
machine-readable: /api/public/registry/beeceptor-echo-api

Follow this tool

Get an alert when Beeceptor Echo 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 Beeceptor Echo 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 Beeceptor Echo through the Agent Nexus MCP server, /llms.txt or the discovery API.