{"id":"3cc957a4-df56-4efa-ab10-cd30cfcd496e","shortId":"Stdc2K","kind":"x402","title":"ACH routing number lookup via x402 micropayment on Base network, $0.02 per request.","tagline":"ACH routing number lookup via x402 micropayment on Base network, $0.02 per request.","description":"This endpoint at `/api/v1/ach/122` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-call APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint appears to provide ACH-related data — likely a routing number lookup or validation service given the `/ach/122` path pattern (122 resembles the start of a US bank routing number). Each call costs $0.02 (20,000 base units of USDC with 6 decimals) and requires no API keys, accounts, or rate-limit management.\n\nThe platform advertises a broad catalog spanning data analytics, AI/ML inference, finance, crypto, and utility endpoints, all at a flat $0.02 per request. Payment is handled inline via the x402 `X-PAYMENT` header using the \"exact\" scheme on Base mainnet, settling to a specified wallet address in USDC (contract `0x8335…2913`). The x402 challenge was confirmed live, returning a proper 402 with version 1 challenge metadata.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The endpoint's exact input parameters and response format are unknown and must be discovered by making a paid call or contacting the provider.","tags":[],"capabilities":["ach-routing-lookup","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","no-rate-limit"],"categories":["finance","infrastructure"],"synonyms":["ACH routing number","bank routing lookup","ABA number","ACH validation","routing number API","bank identifier","payment routing"],"warnings":["No OpenAPI or schema documentation available — input/output formats are unknown","All doc/pricing/API/README pages return only a 'Connect wallet' prompt with no technical content","Endpoint purpose (ACH routing lookup) is inferred from the URL path '/ach/122' and is not confirmed by provider docs","No examples of request or response payloads available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/122","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/ach/122","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the endpoint's exact purpose is inferred from the URL path rather than documented. Effectively a stub 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'/api/v1/ach/122':30 '0.02':11,24,94,135 '000':96 '0x8335':165 '1':179 '122':81 '20':95 '2913':166 '402':176 '6':102 'ABA number' 'ACH routing number' 'ACH validation' 'account':109 'ach':1,14,65 'ach-rel':64 'ach-routing-lookup' 'addit':202 'address':161 'advertis':117 'ai/ml':124 'analyt':123 'api':46,107,189 'appear':61 'avail':217 'bank':88 'bank identifier' 'bank routing lookup' 'base':9,22,54,97,154 'base-network' 'broad':119 'call':45,92,240 'catalog':120 'challeng':169,180 'collect':40 'confirm':171 'connect':197 'contact':242 'contract':164 'cost':93 'crawl':220 'crypto':127 'data':67,122 'decim':103 'detail':204 'discov':235 'doc':187 'document':182 'endpoint':28,60,130,222 'exact':151,224 'exampl':216 'extrem':184 'financ':126 'flat':134 'format':229 'given':76 'handl':140 'header':148 'infer':125 'inlin':141 'input':225 'key':108 'like':68 'limit':113 'live':172 'lookup':4,17,72 'lowpaymentfee.com':35 'mainnet':155 'make':237 'manag':114 'metadata':181 'micropay':7,20 'must':233 'network':10,23,55 'no-api-key' 'no-rate-limit' 'number':3,16,71,90 'offer':38 'openapi':208 'page':192 'paid':239 'paramet':226 'part':32 'path':79 'pattern':80 'pay':43 'pay-per-cal':42 'pay-per-call' 'payment':138,147 'payment routing' 'per':12,25,44,136 'platform':36,116 'price':188 'prompt':199 'proper':175 'protocol':51 'provid':63,244 'rate':112 'rate-limit':111 'readm':191 'relat':66 'render':194 'request':13,26,137 'request/response':211 'requir':105 'resembl':82 'respons':228 'return':173 'rout':2,15,70,89 'routing number API' 'schema':212 'scheme':152 'servic':75 'settl':47,156 'span':121 'spars':185 'spec':209 'specif':59 'specifi':159 'start':84 'technic':203 'unit':98 'unknown':231 'us':87 'usag':215 'usdc':57,100,163 'usdc-settlement' 'use':56,149 'util':129 'valid':74 'version':178 'via':5,18,48,142 'wallet':160,198 'x':146 'x-payment':145 'x402':6,19,50,144,168 'x402-payment'","prices":[{"id":"a1fc6243-7946-4f60-b24d-b9cedc8ce1bd","listingId":"3cc957a4-df56-4efa-ab10-cd30cfcd496e","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/ach/122","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:55.465Z"}],"sources":[{"listingId":"3cc957a4-df56-4efa-ab10-cd30cfcd496e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/122","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:55.465Z","lastSeenAt":"2026-04-27T15:05:15.685Z"}],"details":{"listingId":"3cc957a4-df56-4efa-ab10-cd30cfcd496e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/122 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a live x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/ach/122"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/122"}],"useCases":["Looking up or validating US ACH bank routing numbers programmatically","Integrating routing number verification into payment onboarding flows","Agent-driven financial data retrieval without API key provisioning"],"bestFor":["Developers needing quick, keyless ACH routing lookups","AI agents that can settle x402 micropayments on Base","Applications requiring low-friction, pay-per-use bank data"],"notFor":["Bulk batch processing of thousands of routing numbers (no documented batch endpoint)","Users who cannot transact in USDC on Base network","Anyone needing detailed documentation or SLA guarantees before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.781Z"},"updatedAt":"2026-04-27T15:05:15.685Z"}}