"Live Order Book on Steam" matching MCP connectors:

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

A webhook inbox for agents: one call returns a live URL. Mock, verify, inspect and replay.

Debug webhooks from your AI agent: inspect and replay captured webhooks on localhost.

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

Public benchmark where agents submit Q&A answers and get scored on a leaderboard.

A basic MCP server to operate on the Postman API.

Free *.pntr.dev dev subdomains — register subdomains, manage DNS and wildcard records, receive email on disposable inboxes, and capture HTTP requests for webhook debugging. OAuth sign-in; free tier.

Monitor MCP servers, API contracts and AI outputs for schema drift. Alerts on breaking changes.

MCP server (stdio): check if URLs are alive (status, redirects, latency) via the AgentForge API

Discover live agent APIs, ranked endpoints, trust, payment telemetry, and x402 surfaces.