{"uid":"cap_9ier8aLRgnUjr11WMsMx1","slug":"pre-payment-rail-selection-decision-procedure-for-x402-agents-1b0b0dea","name":"Pre-payment Rail-Selection Decision Procedure for x402 Agents","description":"Paid agent-facing brief on Pre-payment rail-selection decision procedure for x402 agents facing multi-network 402 challenges (Base, Solana, Polygon, Arbitrum, Avalanche, gasless Solana): how to pick which rail to pay on before funds move-0. Blunt decision procedure, not marketing.","url":"https://k2so.wrong.systems/api/services/pre-payment-rail-selection-decision-procedure-fo?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"Pre-payment rail-selection decision procedure for x402 agents facing m paid response","$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-payment-rail-selection-decision-procedure-fo","procedure":"same as brief","generatedAt":"2026-01-01T00:00:00.000Z","generationSource":"deterministic"},"service":"pre-payment-rail-selection-decision-procedure-fo","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_9XL0khuhkQvPPEP4XdgHF","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 blunt, LLM-generated decision procedure brief telling an AI agent which payment rail (Base, Solana, Polygon, Arbitrum, Avalanche, gasless Solana) to use before executing an x402 payment.","exampleAgentPrompt":"Before I pay this x402 invoice, give me the blunt decision procedure for picking which rail to use — I'm facing a multi-network 402 challenge and need to choose between Base, Solana, Polygon, Arbitrum, Avalanche, or gasless Solana.","exampleUseCases":[{"title":"Autonomous agent pre-payment rail selection","prompt":"I'm an autonomous agent about to pay a 402-gated API and I've received challenges on Base and Solana — walk me through the decision procedure for which rail I should actually pay on before any funds move."},{"title":"Multi-network x402 wallet strategy","prompt":"My agent wallet holds USDC on both Polygon and Arbitrum and I keep getting 402 challenges from both networks — give me the step-by-step decision logic for which rail to pick."},{"title":"Gasless Solana vs Base fee trade-off","prompt":"Should my x402 agent use gasless Solana or Base for this payment? Give me the blunt decision procedure so I can pick the right rail before committing funds."}],"resultDescription":"A prose decision-procedure brief telling the agent exactly how to select a payment rail before funds move, including the topic covered, generation source (llm, reasoning, or deterministic), ISO-8601 timestamp, and service slug. The 'procedure' and 'brief' fields contain the actionable guidance.","failureModes":["Missing or invalid payment header results in a 402 response requiring USDC payment before content is returned","Invalid query parameter values (e.g. unsupported meta enum) may result in a 400 error","LLM generation failure may produce an ok:false result in the response body","Network or provider downtime could yield a 5xx error with no brief returned"],"whenToPreferThis":"Use this endpoint when an AI agent is about to execute an x402 payment and needs to decide which blockchain rail to use before committing funds — especially when multiple network challenges are present simultaneously (Base, Solana, Polygon, Arbitrum, Avalanche, gasless Solana). Prefer this over generic documentation when you need a blunt, agent-optimized decision procedure rather than marketing material.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T13:27:25.953Z","isFirstParty":false,"canonicalSlug":"pre-payment-rail-selection-decision-procedure-for-x402-agents-1b0b0dea"}