x402 Inspector

Paste any paid API endpoint. Get the decoded 402 payment challenge, the network and asset named, and lint findings — including whether settlements will list it in the Coinbase Bazaar. Free, no signup.

Rate-limited for humans. Agents and CI: use the paid API (GET https://quartermaster.surewhynot.app/v1/x402/inspect?url=…, $0.002/call, no rate limit) or the x402_inspect MCP tool.