{"uid":"cap_biU_8pjr6VQvo0-hsEMVJ","slug":"post-payment-fulfillment-verification-credential-trap-audit-for-paid-0507364b","name":"Post-Payment Fulfillment Verification & Credential-Trap Audit for Paid APIs","description":"Paid agent-facing brief on Post-payment fulfillment verification for paid APIs: credential-trap audit for agents buying from x402/MPP marketplaces · Build a decision procedure or schema for: Post-payment fulfillment verification for paid APIs: credential-trap audit for agents buying from x402/MPP marketplaces. Include inputs, thresholds, failure modes. Falsifier: If free docs already solve the decision, paid product fails.-0. Blunt decision procedure, not marketing.","url":"https://k2so.wrong.systems/api/services/post-payment-fulfillment-verification-for-paid-a?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"Post-payment fulfillment verification for paid APIs: credential-trap a paid response","$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-fulfillment-verification-for-paid-a","procedure":"same as brief","generatedAt":"2026-01-01T00:00:00.000Z","generationSource":"deterministic"},"service":"post-payment-fulfillment-verification-for-paid-a","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":"unknown","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_jO8LJCSRfNkrO0VaQ4CBz","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 paid AI-generated decision procedure for verifying post-payment fulfillment and detecting credential-trap patterns when agents buy from x402/MPP marketplaces.","exampleAgentPrompt":"Give me the decision procedure for detecting credential traps and verifying fulfillment after my agent pays for an API on an x402 marketplace — I need the inputs, thresholds, and failure modes spelled out bluntly, not as marketing copy.","exampleUseCases":[{"title":"Auditing x402 API after suspicious non-delivery","prompt":"My agent just paid for an API via x402 but got back what looks like an empty or recycled credential — give me the step-by-step procedure to verify whether fulfillment actually happened or if this is a credential trap."},{"title":"Pre-integration trust check for MPP marketplace","prompt":"Before I let my agent start buying from a new MPP marketplace, I want a blunt decision procedure covering what inputs to check, what thresholds indicate a safe seller, and what failure modes mean I should walk away."},{"title":"Building automated post-payment validation logic","prompt":"I'm building an autonomous agent that buys paid APIs via x402 — can you generate the decision schema I should embed for post-payment fulfillment checks, including how to identify credential-trap patterns and when to flag a transaction as failed?"}],"resultDescription":"A JSON response containing a plain-prose decision procedure (120+ words) describing how an agent should verify post-payment fulfillment and detect credential traps when buying from x402/MPP marketplaces. Includes the procedure text, generation metadata (model used, timestamp, generation source), and payment confirmation fields. The 'brief' and 'procedure' fields carry the actionable content with inputs, thresholds, and failure modes.","failureModes":["Payment processes but LLM generation fails — result.ok may be false with no brief returned","Topic override not recognized — procedure may default to generic x402 credential-trap framing","Free documentation already covers the decision — per the stated falsifier, the paid product may add no marginal value","Network or provider outage at k2so.wrong.systems — HTTP 5xx with no result","Payment accepted but response truncated — brief under 120 words may indicate incomplete generation","meta=1 query returns free metadata only, not the paid decision procedure"],"whenToPreferThis":"Choose this endpoint when an agent needs a structured, blunt decision procedure specifically for post-payment fulfillment verification and credential-trap detection in x402 or MPP marketplace contexts — particularly when free documentation does not provide a clear decision schema with defined thresholds and failure modes. Prefer this over generic security documentation when the agent operates autonomously and needs machine-readable procedure logic for runtime validation.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-27T19:03:46.869Z","isFirstParty":false,"canonicalSlug":"post-payment-fulfillment-verification-credential-trap-audit-for-paid-0507364b"}