"Gmail automation tool or service" matching MCP connectors:

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

MCP tool observatory: do registry servers answer, and are their answers true? No key.

ship-on-friday MCP — wraps StupidAPIs (requires X-API-Key)

Check an MCP endpoint resolves: liveness, live tool list, schema drift. Free.

Instant no-signup webhook & HTTP-request inspector for testing webhooks and agent tool-callbacks.

Verify x402 endpoints before payment or publish service profiles for agent discovery.

End-to-end API testing — generate and run tests from OpenAPI, curl, Postman, or real user traffic.

An MCP server that provides tools to validate an email address using Dilli Email Validation API.

40+ developer tools from Context7, Code Runner, Python Execute, NPM Sentinel, PlantUML, and Microsoft Learn. Docs lookup, code execution, security scanning. Starts at $0.01/call. Get your API key at app.xpay.sh or xpay.tools

Conformance checker for MCP servers. Free, no key, verdicts recomputable and re-measured daily.

AI-native mock API server with MCP. Create REST/SOAP mocks from Claude, Cursor, or Windsurf.

HttpStatus MCP Server — 24 AI-callable tools for API testing, mocking, monitoring, and security. Create and manage API mocks, run chaos engineering rules, validate OpenAPI specs, scan URLs for security issues, check SSL certificates, debug CORS, analyze redirect chains, decode JWTs, inspect HAR files, trace distributed requests, capture webhooks, build automation workflows (including Postman import), and set up uptime monitors — all from your AI assistant.

AI-callable tools for API mocking, testing, monitoring, security, and automation.

Remote MCP for 1,500+ APIs. Vault-managed credentials; OAuth or API key. Search, load, and execute.