"Wikipedia - The Free Online Encyclopedia" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Check an A2A agent before you delegate, or an MCP server's measured conduct. Free, no key.
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
API documentation drifts away from the running service, so consumers integrate against a contract nobody keeps. Routebase keeps API design, testing, mocking and documentation on one living source of truth, and this MCP server exposes that workspace to AI agents. Agents can design endpoints, write and run test suites, manage mock servers and publish documentation, always under the permissions of the connected Routebase account.
Independent health, price and history for x402/MPP endpoints. Metered over x402; free grade on web.
Check x402 endpoints like a paying agent: diagnose, fix plans, pre-payment checks. Free quick check.
What is known to be broken in an MCP server or API operation, with the check that found it.
Signed client-declared API receipts. Free preparation/verification; issuance 0.002 USDC via x402.
Free tools: x402 endpoint directory + probe, on-chain x402 demand signal, sudoku, API pricing.
Free agent tests (no account or payment); paid ping.
Webhook URLs for AI agents: receive, wait for, replay, sign and verify webhooks (Stripe, GitHub…).
Point Claude Code, Qwen Code, Cursor, or any MCP client at https://docs.jmeter.ai/api/mcp and your agent answers JMeter questions grounded in this documentation, with a source link for every answer. Free, no API key, no signup.
Free agent-service discovery, OpenAPI document checks, and receipt verification. No API key needed.
Test FIX from Claude, ChatGPT, or Cursor: free sandbox FIX sessions or your own FIXSIM instances.
Turn any task into the right API calls: discover, evaluate, and integrate public APIs.
{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"whoami","arguments":{}}} free no key
Search the JoJ API marketplace, read endpoint docs, and call any API with one key via one gateway.
Check an MCP endpoint resolves: liveness, live tool list, schema drift. Free.
Swagger Petstore API (v1.0.27) as MCP for testing and prototyping powered by the HAPI MCP server
npm MCP — wraps the npm Registry API (free, no auth)
JSONPlaceholder MCP — wraps JSONPlaceholder fake REST API (free, no auth)
