"MCP servers with SSE endpoints" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Publish your API docs so AI assistants can look up endpoints and call your API correctly.
Audits any remote agent or MCP URL for JSON-RPC compliance, latency SLA, OpenAPI schema, and HTTP.
Behind Check and GAIP Watch, and Diagnose: A2A, MCP and OpenAPI checks with a dated change log.
Write, check, render and save sequence diagrams with the request and response on every arrow.
Simceptor is an AI-native Mock API simulation platform with a built-in MCP server. It enables AI agents to create, inspect, update, and test dynamic mock APIs, conditional response rules, stateful session simulations, and network latency directly from context.
x402 endpoint doctor: grades a paid route A-F unpaid, with paste-ready fixes. By Crypto Money Maker
Turn any public webpage into JSON with AI, save it as a live JSON API, and call it from your agent.
Parallel-burst abuse testing for agent APIs with replayable evidence packs.
Registry Rot Watch: liveness + successor-contract verdicts for MCP endpoints.
Live-payload conformance probes with signed receipts: ABSENT/EMPTY/PARTIAL/COMPLETE/BROKEN.
Retrieve YouTube transcripts with timestamps, native captions and asynchronous generation when captions are unavailable. Requires a Capslane 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.
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.
AI-Powered Java/Spring Boot code review API with Alipay AI Pay support.
Deterministic JSON checks with signed evidence and x402-paid execution
Independent health, price and history for x402/MPP endpoints. Metered over x402; free grade on web.
Check an x402 endpoint before you pay it, then test a payment and follow it to settlement.
Live health leaderboard of x402 paid endpoints, plus an MCP server readiness check
Inspect external HTTPS 429/503 retries with server-recorded attempts, Retry-After and arrival times.
Hosted MCP infrastructure with seven typed tools: JSON repair, JSON Schema validation, JSON to TypeScript, CSV to JSON, JSON to CSV, OpenAPI security and webhook checks. Public tool discovery; execution uses scoped Bearer keys with tool allowlists, quotas and request IDs. Free deterministic calls, no LLM calls or USDC payments. Runnable repair → validate → CSV example: https://invokeport.com/agents/workflows/json-pipeline. MCP through 2025-11-25; custom headers, no OAuth.
Your DRF API as MCP tools — 1,800 endpoints become 16 dispatchers, permissioned by Django.
Test any x402 paid URL without paying: 402, PAYMENT-REQUIRED, USDC, amounts, payTo, EIP-712, CORS.
What is known to be broken in an MCP server or API operation, with the check that found it.
Any API, four tools: discover, call with routing and signed receipts, verify, dispute.
Sanctions API docs and request validation, with account-linked synthetic sandbox testing.
Free MCP, API auth, webhook and schema diagnostics with bounded checks and safe quote routing.
Schema-aware API monitoring: diff OpenAPI specs for breaking changes, manage endpoints.
{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"whoami","arguments":{}}} free no key
Keyless webhook endpoints: capture, wait, replay, forward, and generate types from real traffic.
