"A guide to getting UK weather forecasts without API keys" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
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.
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
Audits a sample of HTTP request URLs against explicit, documented cache-key standardization rules...
Any API, four tools: discover, call with routing and signed receipts, verify, dispute.
Generates deterministic webhook HMAC-SHA256 fixtures and optionally verifies a supplied signature...
Test HTTP 429/503 retries and Retry-After with server-observed traces; share synthetic findings.
Webhook capture bins for agents: get a URL, wait for webhooks, set replies, verify signatures.
Guide developers from setup through a verified, policy-aware, audited Alter API call.
SqueezeOS MCP for live machine discovery and x402-paid USDC APIs on Base.
Your DRF API as MCP tools — 1,800 endpoints become 16 dispatchers, permissioned by Django.
Turn any task into the right API calls: discover, evaluate, and integrate public APIs.
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.
npm MCP — wraps the npm Registry API (free, no auth)
mercury-number MCP — wraps StupidAPIs (requires X-API-Key)
always-seven MCP — wraps StupidAPIs (requires X-API-Key)
JSONPlaceholder MCP — wraps JSONPlaceholder fake REST API (free, no auth)
Search the JoJ API marketplace, read endpoint docs, and call any API with one key via one gateway.
Ephemeral mailboxes and a mock OAuth IdP for testing email and auth flows — 39 API-driven tools covering mailboxes, mails, attachments, domains, teams, and mock identities.
Apideck Unified API MCP — 330 tools across 200+ SaaS connectors (accounting, CRM, HRIS, ATS).
