API Testing MCP connectors
Detect breaking changes, generate changelogs, diff, and validate OpenAPI specs.
Free platform to test MCP clients without installing anything. Create mock tools with dynamic templates, configurable delays, conditions (if/then), and response sequences. Supports JSON-RPC 2.0 over Streamable HTTP. Built-in text_echo and json_echo tools. Rate-limited tiers: anonymous (5 calls/min, 1 mock tool), registered (10 calls/min, 4 mock tools), premium (60 calls/min, unlimited). Zero setup — no install, no registration required. More info: https://www.testmcp.dev
Conformance checker for MCP servers. Free, no key, verdicts recomputable and re-measured daily.
Point Gecko at an OpenAPI spec; get first-call-correct, auth-hidden agent tools.
A webhook inbox for agents: one call returns a live URL. Mock, verify, inspect and replay.
ship-on-friday MCP — wraps StupidAPIs (requires X-API-Key)
Your DRF API as MCP tools — 1,800 endpoints become 16 dispatchers, permissioned by Django.
schrodingers-boolean MCP — wraps StupidAPIs (requires X-API-Key)
passive-aggression MCP — wraps StupidAPIs (requires X-API-Key)
Check an MCP endpoint resolves: liveness, live tool list, schema drift. Free.
Discover, pay for, execute, and publish APIs through Apiosk.
Anonymous webhook capture, inspection, waiting, and response configuration for AI agents.
JSONPlaceholder MCP — wraps JSONPlaceholder fake REST API (free, no auth)