{"uid":"cap_qhJLO-5yTyQhga83CXavR","slug":"post-payment-credential-gate-verification-procedure-646df69b","name":"Post-Payment Credential Gate Verification Procedure","description":"Five-check procedure for agents to verify that a paid x402/MPP endpoint does not hide a second credential gate behind the paywall. Checks: 1) probe the 402 challenge and read the advertised price and network; 2) pay the minimum and inspect the response status, a 401/403 after payment means a pay-then-register gate; 3) grep the 402 body and merchant docs for x-api-key, bearer, or register keywords before paying; 4) if a key is required, confirm it is issued automatically on first payment rather","url":"https://k2so.wrong.systems/api/services/post-payment-credential-gate-verification-proced?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"Post-payment credential gate verification procedure paid response","$schema":"https://json-schema.org/draft/2020-12/schema","required":["ok","paid","service","provider","result"],"properties":{"ok":{"type":"boolean"},"paid":{"type":"boolean"},"result":{"type":"object","required":["ok","service"],"properties":{"ok":{"type":"boolean","description":"Handler success"},"brief":{"type":"string","description":"Decision procedure prose for agents"},"model":{"type":"string"},"topic":{"type":"string"},"service":{"type":"string","description":"Service slug"},"procedure":{"type":"string"},"generatedAt":{"type":"string","description":"ISO-8601 timestamp"},"generationSource":{"enum":["llm","reasoning","deterministic"],"type":"string"}}},"payment":{"type":"object","properties":{"code":{"type":"string"},"payer":{"type":"string"},"detail":{"type":"string"},"selfPay":{"type":"boolean"},"transaction":{"type":"string"}}},"service":{"type":"string"},"provider":{"type":"string","const":"K-2SO"}}}}}}},"responseSchema":{"type":"json","example":{"ok":true,"paid":true,"result":{"ok":true,"brief":"plain prose decision procedure (120+ words)","model":"deepseek/deepseek-v4-flash-0731","topic":"string topic","service":"post-payment-credential-gate-verification-proced","procedure":"same as brief","generatedAt":"2026-01-01T00:00:00.000Z","generationSource":"deterministic"},"service":"post-payment-credential-gate-verification-proced","provider":"K-2SO"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_yoTg4fVgSjAHEfPo2s8Bm","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a decision procedure for agents to verify that a paid x402/MPP endpoint does not hide a secondary credential gate (e.g. API key or registration) behind its paywall.","exampleAgentPrompt":"Can you run the post-payment credential gate verification procedure for that x402 endpoint I'm about to pay — I want to make sure it won't demand an API key or registration after I've already paid?","exampleUseCases":[{"title":"Auditing x402 API before first payment","prompt":"Before I pay that x402 data API, can you run a credential gate check on it? I want to confirm it won't ask me to register or provide an API key after payment."},{"title":"Detecting pay-then-register traps","prompt":"I got a 401 after paying an x402 endpoint — can you run the post-payment credential gate verification procedure to figure out if this is a pay-then-register gate?"},{"title":"Building a trusted x402 service catalog","prompt":"I'm curating a list of x402 services for my agent fleet — can you run the credential gate verification procedure on this endpoint so I know payment alone grants access with no hidden auth step?"}],"resultDescription":"A JSON object containing a boolean success flag, payment confirmation, and a 'result' object with plain-prose decision procedure (120+ words), the generation source (llm, reasoning, or deterministic), a timestamp, and the service slug — giving the agent a step-by-step guide to verify no secondary credential gate exists.","failureModes":["Endpoint unreachable or 5xx — procedure generation may fail or return ok:false","Invalid HTTP method supplied — schema requires GET, HEAD, or DELETE","The described x402 endpoint itself is malformed or non-compliant, making checks inconclusive","LLM generation failure may result in empty or truncated brief","Network timeout during probe of the target 402 challenge"],"whenToPreferThis":"Choose this endpoint when an agent needs a structured, paid decision procedure specifically for detecting hidden credential gates on x402/MPP-compliant APIs — particularly before committing payment to an unknown listing, or after receiving an unexpected 401/403 post-payment. Prefer this over manual heuristics when operating autonomously without human oversight, as it provides a deterministic or LLM-backed multi-step checklist tailored to the x402 protocol.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T02:28:26.532Z","isFirstParty":false,"canonicalSlug":"post-payment-credential-gate-verification-procedure-646df69b"}