"Automatic Data Visualization Tool (No API Key Required)" 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.
Detect breaking changes, generate changelogs, diff, and validate OpenAPI specs.
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.
{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"whoami","arguments":{}}} free no key
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.
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.
Turn any task into the right API calls: discover, evaluate, and integrate public APIs.
chaos-index MCP — wraps StupidAPIs (requires X-API-Key)
npm MCP — wraps the npm Registry API (free, no auth)
mercury-number MCP — wraps StupidAPIs (requires X-API-Key)
corporate-apology MCP — wraps StupidAPIs (requires X-API-Key)
always-seven MCP — wraps StupidAPIs (requires X-API-Key)
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.
JSONPlaceholder MCP — wraps JSONPlaceholder fake REST API (free, no auth)
victorian-complaint MCP — wraps StupidAPIs (requires X-API-Key)
Search the JoJ API marketplace, read endpoint docs, and call any API with one key via one gateway.
MCP tool observatory: do registry servers answer, and are their answers true? No key.
