{"uid":"cap_bprXvZkWL6pPQ72aAOvCV","slug":"live-per-rail-fee-index-for-x402-settlement-choice-c02c69d7","name":"Live Per-Rail Fee Index for x402 Settlement Choice","description":"Paid agent-facing brief on Live per-rail fee index for x402 settlement choice: current fee schedules (stablecoin transfer fee, facilitator/merchant fee, L2 gas for the rail) across Base, Solana, MPP/Tempo, and fee-free rails like Open USD, with freshness timestamps and a recommended cheapest rail verdict. Blunt decision procedure, not marketing.","url":"https://k2so.wrong.systems/api/services/live-per-rail-fee-index-for-x402-settlement-choi","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"Live per-rail fee index for x402 settlement choice: current fee schedu paid response","$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":"live-per-rail-fee-index-for-x402-settlement-choi","procedure":"same as brief","generatedAt":"2026-01-01T00:00:00.000Z","generationSource":"deterministic"},"service":"live-per-rail-fee-index-for-x402-settlement-choi","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_KNBQPIEfcDPs2g79d4h7r","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 current fee schedules across Base, Solana, MPP/Tempo, and fee-free rails (Open USD) for x402 payments, with freshness timestamps and a recommended cheapest-rail verdict.","exampleAgentPrompt":"Can you pull the current fee index for x402 rails and tell me which one — Base, Solana, MPP/Tempo, or Open USD — is the cheapest option for settling a stablecoin payment right now?","exampleUseCases":[{"title":"Cheapest rail selection before payment","prompt":"Before my agent sends out a batch of x402 payments, can you check the live fee index and tell me which rail — Base, Solana, MPP/Tempo, or Open USD — has the lowest total cost right now including gas and facilitator fees?"},{"title":"Fee audit for x402 integration","prompt":"I'm integrating x402 into my app and need a clear breakdown of current stablecoin transfer fees, facilitator fees, and L2 gas for each supported rail — can you fetch the latest fee schedule with timestamps?"},{"title":"Automated rail routing decision","prompt":"My agent needs to decide which x402 settlement rail to use — can you get the live per-rail fee data and give me the blunt cheapest-rail verdict so I can route automatically?"}],"resultDescription":"A paid brief containing current fee schedules for each x402 rail (Base, Solana, MPP/Tempo, Open USD) including stablecoin transfer fees, facilitator/merchant fees, and L2 gas costs, along with ISO-8601 freshness timestamps and a blunt cheapest-rail recommendation. Response includes ok/paid status flags, service slug, provider, and generation metadata.","failureModes":["Payment not completed — endpoint requires $0.002 USDC x402 payment; unpaid requests return 402 Payment Required","Stale fee data if underlying rail oracles are unavailable — freshness timestamp indicates data age","Invalid topic override parameter results in default topic being used","LLM generation failure returns ok:false with error detail in result","Network timeout from k2so.wrong.systems may result in no response"],"whenToPreferThis":"Prefer this endpoint when an AI agent needs to make a real-time, cost-optimal routing decision for x402 payments across multiple rails and requires a single authoritative verdict rather than assembling fee data from multiple sources. Especially useful for automated payment routing pipelines where the agent cannot afford to query each rail separately. Choose alternatives if you need raw blockchain fee data without the decision layer, or if you are not using x402 as your payment protocol.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T00:39:54.462Z","isFirstParty":false}