"Tool or method for reading selective emails using POP3, IMAP, or Apple Mail access" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Conformance checker for MCP servers. Free, no key, verdicts recomputable and re-measured daily.
Independent health, price and history for x402/MPP endpoints. Metered over x402; free grade on web.
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
AI-callable tools for API mocking, testing, monitoring, security, and automation.
Test FIX from Claude, ChatGPT, or Cursor: free sandbox FIX sessions or your own FIXSIM instances.
Web search for agents, one x402 payment: real results, provider failover, signed receipt. $0.01.
Free agent tests (no account or payment); paid ping.
{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"whoami","arguments":{}}} free no key
Experimental MCP server for current empirical verification of explicit public HTTPS endpoint claims.
Webhook capture bins for agents: get a URL, wait for webhooks, set replies, verify signatures.
SqueezeOS MCP for live machine discovery and x402-paid USDC APIs on Base.
Production proofs for breaking JSON Schema/MCP changes; UNKNOWN/NO_WITNESS_FOUND not compatible.
Read-only ArcadeOps discovery for developer docs, OAuth, OpenAPI and synthetic sandbox.
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.
If-None-Match star-or-etag, value discarded
ACAO star-or-origin, value discarded
MCP tool observatory: do registry servers answer, and are their answers true? No key.
Retry-After integer-or-date, value discarded
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.
