{"uid":"cap_66JrvjAIKeF03gwfnv9bR","slug":"x402-new-rail-rollout-decision-procedure-with-cdn-stale-challenge-c333bf1e","name":"x402 New-Rail Rollout Decision Procedure with CDN Stale-Challenge Handling","description":"Decision procedure for a merchant adding a new settlement rail to a live x402-metered endpoint. Covers the CDN stale-challenge problem (edge caches serving old 402 payment terms), pre-flight capability evidence for the new rail, staged rollout with old rail kept active, cross-region 402 challenge verification, and explicit rollback criteria. Output: PASS with rollout window or ROLLBACK with evidence. Built for operators who have been burned debugging stale CDN caches after announcing a new rail","url":"https://k2so-8080.on.ascii.dev/api/services/x402-endpoint-new-rail-rollout-procedure-for-mer?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"x402 endpoint new-rail rollout with CDN stale-challenge handling paid response","$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_yJLaiKBaGBYqCX09Y3IqW","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 PASS or ROLLBACK decision for safely adding a new payment settlement rail to a live x402-metered endpoint, covering CDN stale-challenge mitigation, pre-flight capability checks, staged rollout, and rollback criteria.","exampleAgentPrompt":"I'm about to add a new USDC settlement rail to my live x402-metered API and I'm worried about CDN edge caches serving stale 402 payment terms — can you run the new-rail rollout decision procedure and tell me if I should proceed or roll back?","exampleUseCases":[{"title":"CDN stale-challenge go/no-go before launch","prompt":"We're adding a new Ethereum settlement rail to our live x402 endpoint tomorrow and I've been burned before by edge caches serving old 402 payment terms — run the rollout decision procedure and tell me if it's safe to proceed or if we need to roll back."},{"title":"Staged rollout with legacy rail still active","prompt":"I want to keep our existing Base rail running while we stage a rollout of a new Solana settlement rail on our x402 API — give me the step-by-step procedure and a PASS or ROLLBACK verdict with evidence."},{"title":"Cross-region 402 challenge verification after rail switch","prompt":"After switching our x402 endpoint to a new settlement rail, some regions are still seeing old 402 challenges — can you run the cross-region verification procedure and tell me whether to continue the rollout or trigger rollback?"}],"resultDescription":"A structured response containing a PASS with rollout window or ROLLBACK with supporting evidence, plus a detailed decision procedure prose brief covering CDN stale-challenge handling, pre-flight capability evidence for the new rail, staged rollout guidance, and explicit rollback criteria. Includes generation timestamp, source model, and service metadata.","failureModes":["Missing required 'type' or 'method' input fields returns a validation error","Invalid method values (outside GET/HEAD/DELETE) are rejected by schema","LLM generation failure may return ok:false with no procedure text","Network timeout to the k2so-8080.on.ascii.dev host results in no response","Payment failure (insufficient USDC or stale 402 challenge) blocks paid response; use meta=1 for free metadata only"],"whenToPreferThis":"Choose this endpoint when you are a merchant or operator adding a new settlement rail to a live x402-metered API and need a structured go/no-go decision that explicitly addresses CDN stale-challenge propagation delays, cross-region 402 verification, and rollback criteria — especially if you have previously encountered CDN cache problems after announcing a new rail. Prefer over generic rollout guides when you need an x402-specific, agent-callable decision procedure with explicit PASS/ROLLBACK output.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-23T01:43:02.703Z","isFirstParty":false,"canonicalSlug":"x402-new-rail-rollout-decision-procedure-with-cdn-stale-challenge-c333bf1e"}