{"uid":"cap_lQb10t_r-I8VzxGNS8HSi","slug":"quietsignal-x402-readiness-checker-ec9f6d77","name":"QuietSignal x402 Readiness Checker","description":"QuietSignal Public Data: independent, read-only rollup, wallet, opportunity, and developer-data facts for agents, paid per request with USDC over HTTP 402 on Base.","url":"https://83-29-153-50.sslip.io/v1/x402-readiness","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["url"],"properties":{"url":{"type":"string","format":"uri","description":"Public x402-enabled endpoint to inspect"}},"additionalProperties":false}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"checks":{"openapi_reachable":true,"target_returns_402":true,"target_exposes_payment_challenge":true},"schema":"x402-readiness/v1","assessment":{"ready_for_machine_discovery":true},"disclaimer":"Bounded unpaid public-metadata checks only; not a security audit."}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.1","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.1/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_B78gx4b6V_BtNce5OCns4","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.1","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Inspects a public URL to verify whether it correctly implements the x402 HTTP payment protocol and is ready for machine discovery","exampleAgentPrompt":"Check whether https://api.myservice.com/data is properly set up for x402 machine payments — I want to know if it returns a 402 challenge and is ready for agent discovery.","exampleUseCases":[{"title":"Pre-listing x402 compliance check","prompt":"Before I list my new data endpoint on a discovery bazaar, can you verify that https://api.mydata.io/v1/prices is actually returning a proper 402 payment challenge and is x402-ready for machine discovery?"},{"title":"Debugging a failed x402 integration","prompt":"My endpoint at https://dev.quietsignal.io/v1/wallet-facts isn't getting picked up by agents — can you inspect it and tell me whether it's exposing the payment challenge correctly and if OpenAPI is reachable?"},{"title":"Auditing a third-party x402 endpoint","prompt":"I'm thinking of integrating with https://partner-api.example.com/opportunities — can you do a quick x402 readiness check on it to confirm it's properly configured for HTTP 402 before I build against it?"}],"resultDescription":"A JSON object with a schema identifier ('x402-readiness/v1'), three boolean checks (openapi_reachable, target_returns_402, target_exposes_payment_challenge), an overall assessment of whether the endpoint is ready_for_machine_discovery, and a disclaimer noting this is a bounded public-metadata check only, not a security audit.","failureModes":["Target URL is unreachable or times out — checks may return false or partial results","Target URL is not a valid URI — input validation error","Target does not return HTTP 402 at all — target_returns_402 will be false","OpenAPI spec is not accessible — openapi_reachable will be false","Payment challenge header/body is missing — target_exposes_payment_challenge will be false","Payment required ($0.1 USDC via x402) is not satisfied — HTTP 402 returned by this endpoint itself"],"whenToPreferThis":"Use this endpoint when you need a quick, independent, machine-readable assessment of whether a specific URL correctly implements the x402 HTTP payment protocol — especially before listing an endpoint on a discovery marketplace, debugging a broken x402 integration, or evaluating a third-party endpoint for x402 compatibility. It is not a security audit and only performs bounded public-metadata checks.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T20:25:37.138Z","isFirstParty":false}