x402 lint

Check your paid x402 endpoint the way buyers' agents and catalogues see it: one unpaid request, then the 402 terms against the spec (v2 header and v1 body), your catalogue listing, OFAC, and discovery files. MPP endpoints (WWW-Authenticate: Payment, IETF draft-httpauth-payment) are linted too. Free, no sign-up. API: GET /v1/lint?url=…, MCP tool lint_x402_endpoint.