{"uid":"cap_YiaZrTZhSS-TAc8LuYjJ5","slug":"k-2so-x402-new-rail-rollout-decision-procedure-4e0d61c0","name":"K-2SO x402 New-Rail Rollout Decision Procedure","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.wrong.systems/api/services/x402-endpoint-new-rail-rollout-procedure-for-mer","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":{"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":"x402-endpoint-new-rail-rollout-procedure-for-mer","procedure":"same as brief","generatedAt":"2026-01-01T00:00:00.000Z","generationSource":"deterministic"},"service":"x402-endpoint-new-rail-rollout-procedure-for-mer","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_cnRo3BQyuwJTRajkv3AE0","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 brief for rolling out a new payment rail in x402 agent merchant systems, including CDN stale-challenge handling.","exampleAgentPrompt":"Walk me through the decision procedure for rolling out a new x402 payment rail with CDN stale-challenge handling — I need a plain-prose brief my agent can follow when deciding whether and how to migrate to the new rail.","exampleUseCases":[{"title":"New payment rail migration planning","prompt":"My autonomous agent merchant on Base needs a decision procedure for rolling out a new x402 payment rail — can you get me the step-by-step brief, especially covering how to handle CDN stale-challenge edge cases?"},{"title":"CDN caching conflict during rollout","prompt":"During our x402 new-rail rollout, we're hitting CDN stale-challenge errors — what's the recommended decision procedure for handling these so our agent doesn't reject valid payments?"},{"title":"Custom topic override for rail rollout","prompt":"Get me the x402 new-rail rollout decision procedure but focused specifically on the topic of fallback behavior when the new rail is unavailable — I want the full prose brief for my agent."}],"resultDescription":"A JSON object containing a plain-prose decision procedure brief (120+ words) for the new-rail rollout scenario, including the topic, generating model name, generation source (llm/reasoning/deterministic), ISO-8601 timestamp, and service slug. The 'brief' and 'procedure' fields contain actionable guidance an AI agent can follow directly.","failureModes":["HTTP 402 returned if payment not settled — agent must pay exact USDC and retry with PAYMENT-SIGNATURE header","Stale CDN challenge may cause payment signature rejection — agent must handle cache invalidation","Invalid or missing 'method' enum value returns validation error","Topic override too broad or malformed may produce generic output","Payment settlement race condition if USDC balance insufficient"],"whenToPreferThis":"Choose this endpoint when an autonomous agent needs structured, LLM-generated decision guidance specifically for x402 new payment rail rollout scenarios with CDN stale-challenge handling. Prefer over general documentation when the agent needs machine-consumable prose it can act on immediately within a paid x402 workflow.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T19:02:30.150Z","isFirstParty":false}