{"uid":"cap_7TtUGaYiKd9RX9Ono_0X3","slug":"gw8-signal-api-payment-rail-cost-checker-09092733","name":"GW8 Signal API – Payment Rail Cost Checker","description":"[Payment rails: fee + speed comparison] Cheapest and fastest payment rail right now for a USD amount (?amount=100): Base USDC (live gas x ETH/USD, ~2s), XRPL RLUSD/XRP (live fee x XRP/USD, ~3-5s), Tempo and Circle Arc (live gas, USD fees, ~1s), card (static 2.9% + $0.30, days). Fee USD/%, settlement time, sources, agent protocols per rail, recommended pick. Dead sources marked unavailable. 60s cache. $0.002 USDC. Signal only.","url":"https://micro-saas-agent.onrender.com/api/rails?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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"],"type":"string"},"queryParams":{"type":"object","properties":{"amount":{"type":"number","example":100}},"additionalProperties":false}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{}}}}},"responseSchema":{"type":"json","example":{"rails":[{"rail":"base-usdc","feePct":0.00095,"feeUsd":0.00095,"status":"live","settlement":"~2s"},{"rail":"xrpl-rlusd-xrp","feePct":0.000025,"feeUsd":0.000025,"status":"live","settlement":"~3-5s"},{"rail":"card","feePct":3.2,"feeUsd":3.2,"status":"static-estimate","settlement":"~1-3 business days"}],"amountUsd":100,"recommended":{"rail":"xrpl-rlusd-xrp","fastest":"base-usdc"}}},"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_oxZbqnRG3BRLCSsRC41Pi","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 fee percentages, USD costs, settlement times, and a recommended rail for a given payment amount across Base USDC, XRPL RLUSD, and card rails","exampleAgentPrompt":"I need to send $100 — can you check which payment rail is cheapest and fastest right now, comparing Base USDC, XRPL RLUSD, and card?","exampleUseCases":[{"title":"Cheapest rail for micropayment","prompt":"I'm about to make a $2 micropayment for an API call — which rail has the lowest fee, Base USDC or XRPL RLUSD, and how long will it take to settle?"},{"title":"Large payment rail comparison","prompt":"I need to send $5000 to a vendor — can you compare the total fees and settlement times across crypto rails and card so I know the smartest option?"},{"title":"Agent spend policy rail selection","prompt":"Before my agent pays for a data service, check which payment rail costs less in fees for a $0.50 transaction and tell me the recommended one."}],"resultDescription":"Returns a list of available payment rails (Base USDC, XRPL RLUSD, card) each with fee percentage, fee in USD, live/static status, and settlement time estimate. Also returns the queried amount, a recommended rail for cost efficiency, and the fastest rail for speed.","failureModes":["Missing or invalid 'amount' query parameter returns error or empty rail list","Service unavailable on Render free tier causing timeout or 503","Stale fee data if upstream sources are slow to update (card fee is noted as static-estimate)","No payment made on failure — charge only occurs after data is returned successfully"],"whenToPreferThis":"Use this endpoint when an AI agent or user needs to decide which payment rail to use for a specific USD amount, balancing cost vs speed. Prefer it over manual fee lookups when you need a single call that covers Base USDC, XRPL RLUSD, and card in one response with a built-in recommendation. Especially useful for x402-enabled agent workflows where rail choice affects operating costs at scale.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-22T12:41:04.872Z","isFirstParty":false,"canonicalSlug":"gw8-signal-api-payment-rail-cost-checker-09092733"}