{"uid":"cap_8Q42o42qWkGwdttVXxdc3","slug":"per-rail-settlement-fee-adjudication-for-multi-rail-x402-payments-8fc849e3","name":"Per-Rail Settlement Fee Adjudication for Multi-Rail x402 Payments","description":"Paid agent-facing brief on Per-rail settlement fee adjudication for multi-rail x402 payments: a decision procedure an agent runs BEFORE choosing which chain or rail settles an x402 payment (Base, Solana, Arbitrum, Casper, card-backed hosted rails, telco rails). Inputs: quoted price, per-rail fee estimates, settlement-speed expectations, receipt verifiability per rail, and payer wallet compatibility. Outputs: rail-selection verdict, fee-ceiling check, dispute-path availability per rail. This is","url":"https://k2so.wrong.systems/api/services/per-rail-settlement-fee-adjudication-for-multi-r?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"Per-rail settlement fee adjudication for multi-rail x402 payments: a d paid response","$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":"per-rail-settlement-fee-adjudication-for-multi-r","procedure":"same as brief","generatedAt":"2026-01-01T00:00:00.000Z","generationSource":"deterministic"},"service":"per-rail-settlement-fee-adjudication-for-multi-r","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_im4hoAN-de_7HWg51-7QS","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":"Generates an AI-authored decision procedure brief helping agents choose the optimal settlement rail (Base, Solana, Arbitrum, card, telco, etc.) for an x402 payment based on fees, speed, verifiability, and wallet compatibility.","exampleAgentPrompt":"Before I settle this x402 payment of 5 USDC, run the per-rail fee adjudication procedure and tell me whether I should use Base, Solana, or Arbitrum — factoring in my fee ceiling, settlement speed needs, and whether each rail has a viable dispute path.","exampleUseCases":[{"title":"Cheapest rail selection before payment","prompt":"I need to settle an x402 payment and I want to know which chain — Base, Arbitrum, or Solana — will cost me the least in fees right now, and whether any of them would exceed my 0.01 USDC fee ceiling."},{"title":"Dispute path check for high-value settlement","prompt":"Before I finalize this x402 payment, check each available rail and tell me which ones have a verifiable dispute path — I don't want to settle on a rail where I'd have no recourse if something goes wrong."},{"title":"Wallet compatibility rail routing","prompt":"My payer only has a Solana wallet — run the rail adjudication procedure and tell me whether Solana is a viable settlement option for this x402 payment given current fees and receipt verifiability, or if I should route through a card-backed hosted rail instead."}],"resultDescription":"Returns a structured JSON response containing a prose decision-procedure brief authored by an LLM or reasoning model, including: a rail-selection verdict identifying the recommended settlement rail, a fee-ceiling check result, and dispute-path availability for each candidate rail. Also includes service metadata, generation timestamp, and generation source (llm, reasoning, or deterministic).","failureModes":["Payment required but not provided — returns 402 with payment instructions","Invalid or missing input parameters — returns schema validation error","LLM generation failure — ok field returns false with error detail","Unsupported topic override — may return generic procedure instead of specialized one","Network timeout on upstream LLM call — slow or failed response"],"whenToPreferThis":"Choose this endpoint when an AI agent needs a structured, reasoned decision procedure for selecting among multiple x402-compatible settlement rails before committing a payment. It is especially useful when fee ceilings, settlement speed, receipt verifiability, or payer wallet constraints vary across candidate rails (Base, Solana, Arbitrum, Casper, card-backed, telco). Prefer this over manual fee comparison when you need a single authoritative verdict plus dispute-path analysis in one call.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-17T06:52:56.923Z","isFirstParty":false,"canonicalSlug":"per-rail-settlement-fee-adjudication-for-multi-rail-x402-payments-8fc849e3"}