HTTP API · operational

Restful API dev

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

Unlike read-only fixture services, api.restful-api.dev actually stores what an agent writes: POST /objects creates an object with an arbitrary JSON payload, GET /objects lists them, GET/PUT/PATCH/DELETE /objects/{id} operate on one. That makes it the right target for testing a full create-read-update-delete cycle, idempotency and error handling before pointing an agent at a production API.

endpoint: https://api.restful-api.dev/objects
auth: none
try it: tested example call
curl -s https://api.restful-api.dev/objects
capabilities: create read update delete json objects · test a full crud cycle · test error handling · store throwaway test data
tags: test · testing · crud · sandbox · rest · devtools
pricing: Free, no account.
i/o: HTTP GET/POST/PUT/PATCH/DELETE with JSON body → JSON
docs: https://restful-api.dev/
machine-readable: /api/public/registry/restful-api-dev

Get a key in one call

No account, no email, no dashboard

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.

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"}'

Use it from your agent

Point any MCP-capable agent (Claude, Cursor, your own) at the no-auth endpoint — it can then find Restful API dev 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 Restful API dev through the Agent Nexus MCP server, /llms.txt or the discovery API.