{"id":"38074da8-2971-4c5e-a0c8-876e91638327","shortId":"vcTdpx","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/121` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-call APIs settled via x402 micropayments in USDC on the Base network. The specific endpoint appears to serve ACH-related data — likely a routing number lookup or validation given the `/ach/121` path pattern (121 resembles the start of a US bank routing number). The platform advertises uniform $0.02-per-request pricing with no API keys, no rate limits, and instant access.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled in USDC (contract `0x8335...2913` on Base) with a max amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The payment scheme is \"exact\" with a 300-second timeout. No OpenAPI schema or detailed documentation was found for this specific endpoint — the docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nThe broader lowpaymentfee.com platform lists endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories, all at the same $0.02 price point. However, the `/api/v1/ach/121` endpoint is not listed on the homepage's API catalog, which raises questions about whether it is a fully supported production endpoint or a less-documented route. Without request/response schema documentation, the exact input parameters and output format remain unknown.","tags":[],"capabilities":["ach-routing-lookup","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["finance","data"],"synonyms":["ACH routing number","bank routing lookup","ABA number","ACH validation","routing number API","bank identification"],"warnings":["No request or response schema available for this endpoint","Endpoint /api/v1/ach/121 is not listed in the site's public API catalog — may be undocumented or experimental","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content","Exact functionality is inferred from the URL path; actual behavior is unconfirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/121","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/121","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation for this specific endpoint — no request/response schema, no examples, and the endpoint isn't listed in the site's own API catalog. The docs/pricing/API pages all render only a wallet-connect prompt with no useful 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'/api/v1/ach/121':30,207 '0.02':11,24,93,141,202 '000':136 '0x8335':126 '121':79 '20':135 '2913':127 '300':153 '6':144 'ABA number' 'ACH routing number' 'ACH validation' 'accept':117 'access':107 'ach':1,14,64 'ach-rel':63 'ach-routing-lookup' 'across':191 'advertis':91 'ai/ml':193 'amount':133 'api':46,100,172,216 'appear':60 'bank':86 'bank identification' 'bank routing lookup' 'base':9,22,55,129,137 'base-network' 'broader':186 'call':45 'catalog':217 'categori':197 'challeng':110 'confirm':111 'connect':178 'content':184 'contract':125 'data':66 'data/analytics':192 'decim':145 'detail':160 'doc':169 'document':161,234,239 'endpoint':28,59,113,167,190,208,229 'equal':140 'exact':150,241 'finance/web3':194 'format':246 'found':163 'fulli':226 'given':74 'homepag':214 'howev':205 'infrastructur':196 'input':242 'instant':106 'key':101 'less':233 'less-docu':232 'like':67 'limit':104 'list':189,211 'live':115 'lookup':4,17,71 'lowpaymentfee.com':35,187 'max':132 'micropay':7,20,50 'network':10,23,56 'no-api-key' 'number':3,16,70,88 'offer':38 'openapi':157 'output':245 'page':173 'paramet':243 'part':32 'path':77 'pattern':78 'pay':43 'pay-per-cal':42 'pay-per-call' 'payment':120,147 'per':12,25,44,95 'per-request':94 'platform':36,90,188 'point':204 'post':118 'price':97,170,203 'product':228 'prompt':180 'question':220 'rais':219 'rate':103 'relat':65 'remain':247 'request':13,26,96,119 'request/response':237 'resembl':80 'return':175 'rout':2,15,69,87,235 'routing number API' 'schema':158,238 'scheme':148 'second':154 'serv':62 'settl':47,122 'specif':58,166 'start':82 'substant':183 'suit':40 'support':227 'timeout':155 'uniform':92 'unit':138 'unknown':248 'us':85 'usdc':52,124,142 'usdc-settlement' 'use':143 'valid':73 'via':5,18,48 'wallet':179 'whether':222 'without':236 'x402':6,19,49,109 'x402-payment'","prices":[{"id":"22c1c41f-4c03-426e-8902-424ced897100","listingId":"38074da8-2971-4c5e-a0c8-876e91638327","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/121","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:56.047Z"}],"sources":[{"listingId":"38074da8-2971-4c5e-a0c8-876e91638327","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/121","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:56.047Z","lastSeenAt":"2026-04-29T01:33:27.305Z"}],"details":{"listingId":"38074da8-2971-4c5e-a0c8-876e91638327","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/121 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/ach/121"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/121"}],"useCases":["Looking up ACH routing number details for payment processing","Validating bank routing numbers before initiating transfers","Enriching financial transaction data with bank information"],"bestFor":["Agents needing on-demand ACH routing data without API key management","Micropayment-based financial data lookups","Crypto-native applications that can settle in USDC on Base"],"notFor":["Bulk batch lookups where per-call pricing is inefficient","Applications requiring detailed API documentation and SLAs","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.741Z"},"updatedAt":"2026-04-29T01:33:27.305Z"}}