{"uid":"cap_PW9eEEx5dnTtGOqIRTlTG","slug":"losbeto-x402-endpoint-auditor-4baba705","name":"Losbeto x402 Endpoint Auditor","description":"OpenAI-compatible LLM gateway at $0.005/call — change base_url, pay in USDC. Plus pay-per-call market data: multi-oracle price consensus, sentiment, forex, equities, commodities, Brazil macro (BCB/B3) and crypto. No API keys, no accounts. USDC on Base, Solana and Algorand via x402.","url":"https://markets.losbeto.xyz/x402-audit?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","properties":{"queryParams":{"type":"object","required":["url"],"properties":{"url":{"type":"string","description":"Public http/https URL to fetch (internal/private ranges refused)"}}}}},"output":{"type":"object","properties":{"example":{"type":"object","description":"Will this x402 endpoint survive a real paying agent — or quietly eat its payment? Audit any endpoint (?url=https://target/path) against the x402 v2 spec: 402 status, challenge structure, accepts fields, price floor, discovery extension — plus failure modes learned the hard way operating a live paid node: oversized headers that abort Node clients, unpadded base64 that breaks strict..."}}}}},"responseSchema":{"type":"json"},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","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":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_M5fynot9KyDprYLYMMOto","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Audits any x402-enabled HTTP endpoint for spec compliance, payment correctness, and common failure modes by fetching and analyzing its 402 challenge response","exampleAgentPrompt":"Audit the x402 endpoint at https://api.example.com/data to check whether it's properly implemented — does it return a valid 402 challenge, correct accepts fields, price floor, and no header or base64 issues that would break paying agents?","exampleUseCases":[{"title":"Pre-launch x402 endpoint health check","prompt":"Before I go live, can you audit my x402 endpoint at https://myapi.example.com/premium-data to make sure the 402 challenge is correctly structured, the base64 is properly padded, and the accepts fields won't route payments away from the indexing facilitator?"},{"title":"Debugging a broken paid API integration","prompt":"My x402 endpoint at https://payments.myservice.io/api/prices is not getting picked up by agents — can you audit it and tell me exactly what's wrong with the challenge structure or headers?"},{"title":"Third-party x402 endpoint trust check","prompt":"I'm thinking of integrating this paid data feed at https://markets.thirdparty.xyz/feed — can you audit it to see if it actually follows the x402 v2 spec and won't silently eat my USDC payment?"}],"resultDescription":"A structured audit report covering: HTTP 402 status presence, challenge structure validity, accepts field correctness and ordering, price floor declaration, discovery extension compliance, and known failure modes such as oversized headers, unpadded base64, and accepts ordering that diverts settlement away from facilitators","failureModes":["Target URL is on an internal/private IP range — request refused","Target endpoint does not return a 402 response at all — audit flags as non-compliant","Target endpoint times out — audit cannot complete","Malformed or unreachable URL — returns error","Target endpoint returns unexpected content type preventing analysis"],"whenToPreferThis":"Use this endpoint when you need to verify that an x402-enabled API is correctly implemented before integrating it, deploying it, or trusting it with real USDC payments. It is especially valuable for catching subtle implementation bugs — oversized headers, unpadded base64, incorrect accepts ordering — that standard HTTP checks miss and that cause silent payment failures in production agents.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-10T18:39:14.213Z","isFirstParty":false,"canonicalSlug":"losbeto-x402-endpoint-auditor-4baba705"}