"Tools or extensions for enhancing browser functionality" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Check an A2A agent before you delegate, or an MCP server's measured conduct. Free, no key.
Discovery registry for AI agents: 660+ APIs, MCP servers and CLIs, each health-checked every 6 hours with real requests — full initialize + tools/list handshakes for MCP, real calls for APIs — plus response-schema validation that catches responses which parse fine but are missing a required field.
Remote MCP that evaluates one public HTTPS URL for WebMCP readiness: intent, tools observed, what to add, what never to expose.
Webhook, email, WebSocket and tunnel testing for AI agents: capture, wait, verify, replay.
A webhook inbox for agents: one call returns a live URL. Mock, verify, inspect and replay.
Deterministic release-compatibility preflight for OPC UA NodeSet2 XML.
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
Deterministic preflight for FactoryTalk View tag and alarm CSV imports before re-import.
Independent health, price and history for x402/MPP endpoints. Metered over x402; free grade on web.
AI-callable tools for API mocking, testing, monitoring, security, and automation.
Point Gecko at an OpenAPI spec; get first-call-correct, auth-hidden agent tools.
Test curl retries locally or inspect remote 429/503 Retry-After traces; optionally share findings.
Any API, four tools: discover, call with routing and signed receipts, verify, dispute.
What is known to be broken in an MCP server or API operation, with the check that found it.
Apideck Unified API MCP — 330 tools across 200+ SaaS connectors (accounting, CRM, HRIS, ATS).
Anonymous webhook capture, inspection, waiting, and response configuration for AI agents.
Free tools: x402 endpoint directory + probe, on-chain x402 demand signal, sudoku, API pricing.
Free agent tests (no account or payment); paid ping.
Webhook URLs for AI agents: receive, wait for, replay, sign and verify webhooks (Stripe, GitHub…).
Paid OpenAPI audit and API change detection for agents. $0.10 USDC per analysis via x402 on Base.
