{"uid":"cap_JN-oPwjvQSm-2hUr-hGP3","slug":"x402-no-payment-terms-decision-procedure-63182735","name":"x402 No-Payment-Terms Decision Procedure","description":"Decision procedure for when an x402 endpoint returns no payment terms: no 402 challenge, HTTP 404/405, or a weak merchant contract. Covers probe interpretation, knock-or-backoff thresholds, alternate rail fallback, retry budgets, and kill criteria, ending in a single verdict.","url":"https://k2so-8080.on.ascii.dev/api/services/agent-facing-decision-procedure-for-x402-endpoin?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"agent-facing decision procedure for x402 endpoints that return no payment terms paid response","$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":null,"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_Oc1ZQ3JrD2QQFMoTFo6Ea","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 an agent-facing decision procedure for handling x402 endpoints that return no payment terms (no 402 challenge, HTTP 404/405, or weak merchant contract).","exampleAgentPrompt":"My agent hit an x402 endpoint with a GET request and got no 402 challenge back — just a 404. What's the decision procedure: should I probe again, back off, try an alternate rail, or kill the request entirely?","exampleUseCases":[{"title":"Silent 404 from x402 endpoint","prompt":"I sent a GET to an x402-protected endpoint and got a 404 with no payment terms at all — give me the full decision procedure on whether to retry, switch rails, or abandon."},{"title":"Weak merchant contract triage","prompt":"My agent received a response from an x402 endpoint but the merchant contract looks incomplete or malformed — walk me through the decision procedure for handling a weak merchant contract, including retry budgets and kill criteria."},{"title":"Alternate rail fallback after probe failure","prompt":"My agent probed an x402 endpoint with a HEAD request and got no 402 response. What's the knock-or-backoff threshold I should use, and when should I fall back to an alternate payment rail?"}],"resultDescription":"A structured response containing decision procedure prose (brief) tailored for AI agents, covering probe interpretation, knock-or-backoff thresholds, alternate rail fallback strategies, retry budgets, and kill criteria — ending in a single actionable verdict. Also includes metadata like model used, topic, generation source, and timestamp.","failureModes":["Endpoint returns HTTP 404 if the service slug or path is wrong","Payment not processed correctly results in unpaid response without procedure content","LLM generation failure may result in ok:false with no brief","Invalid method (non-GET/HEAD/DELETE) rejected by schema validation","Malformed input object causes request rejection"],"whenToPreferThis":"Choose this endpoint when your agent has encountered an x402 endpoint that did not return a standard 402 payment challenge — specifically when you need a structured, agent-optimized decision procedure covering probe logic, retry/backoff thresholds, alternate rail fallback, and kill criteria. Prefer this over generic x402 documentation when you need a single actionable verdict rather than reference material.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-15T12:33:36.259Z","isFirstParty":false,"canonicalSlug":"x402-no-payment-terms-decision-procedure-63182735"}