{"uid":"cap_tSXYJNfX7NthBIRnd04Jw","slug":"pre-integration-merchant-challenge-contract-grading-for-x402-agents-de7f66bc","name":"Pre-integration Merchant Challenge-Contract Grading for x402 Agents","description":"Paid agent-facing brief on Pre-integration merchant challenge-contract grading for agents adopting paid x402 endpoints: a deterministic procedure to probe a candidate paid API without paying, classify its 402 challenge quality (proper 402 with price+network in WWW-Authenticate, wrong status 404/405/401, thin JSON, missing payment terms), score integration risk, and decide adopt/flag/refuse before wiring the endpoint into an-0. Blunt decision procedure, not marketing.","url":"https://k2so.wrong.systems/api/services/pre-integration-merchant-challenge-contract-grad?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"Pre-integration merchant challenge-contract grading for agents adoptin paid response","$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":"pre-integration-merchant-challenge-contract-grad","procedure":"same as brief","generatedAt":"2026-01-01T00:00:00.000Z","generationSource":"deterministic"},"service":"pre-integration-merchant-challenge-contract-grad","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_WcwYm7B4qnKeebJ2-i3Ig","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 deterministic decision brief that classifies a candidate paid API's 402 challenge quality and scores integration risk so an agent can decide to adopt, flag, or refuse the endpoint before committing payment.","exampleAgentPrompt":"Before I wire this paid endpoint into my workflow, run the pre-integration grading procedure on it — check whether its 402 challenge is properly formed with price and network in WWW-Authenticate, classify any issues, and give me an adopt/flag/refuse decision.","exampleUseCases":[{"title":"Vetting a new paid data API","prompt":"I'm about to add a paid weather data endpoint to my agent stack — can you run the 402 challenge grading on it first and tell me if its payment contract looks solid or if I should flag it?"},{"title":"Auditing a suspicious 404-returning endpoint","prompt":"This API I found keeps returning 404 instead of 402 when I try to access it without payment — can you classify what's wrong with its challenge contract and score the integration risk?"},{"title":"Bulk pre-flight check before agent deployment","prompt":"Before I deploy my agent fleet to production, I need to grade the 402 challenge quality on our primary paid endpoint — run the deterministic decision procedure and tell me adopt, flag, or refuse."}],"resultDescription":"A structured JSON response containing a decision procedure brief (prose), the challenge quality classification (proper 402, wrong status, thin JSON, missing payment terms), an integration risk score, and an adopt/flag/refuse recommendation — along with the generation source (llm, reasoning, or deterministic), service slug, and ISO-8601 timestamp.","failureModes":["Candidate endpoint does not return any 402 response, making classification impossible","WWW-Authenticate header is absent or malformed, causing thin-JSON or missing-terms classification","Network or price fields are absent from the 402 challenge, resulting in a high-risk score","Service unavailable on k2so.wrong.systems returns no brief","Payment not completed results in unpaid 402 response from this endpoint itself"],"whenToPreferThis":"Choose this endpoint when an AI agent needs a structured, deterministic pre-integration audit of a candidate paid x402 API — especially when the agent must decide adopt/flag/refuse before spending any USDC. It is specifically designed for the x402 ecosystem and understands WWW-Authenticate header conventions, price+network fields, and common malformation patterns that generic API testing tools would miss.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T13:27:49.720Z","isFirstParty":false,"canonicalSlug":"pre-integration-merchant-challenge-contract-grading-for-x402-agents-de7f66bc"}