{"id":"470cf402-4b34-4077-abff-83a5d438b122","shortId":"xvuCkH","kind":"x402","title":"Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC, no API keys required.","description":"This endpoint at `/api/v1/ach/91` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/ach/91` is listed under the generic title \"Premium API Access.\" The platform does not provide documentation explaining what the ACH endpoint returns or what input it expects — the docs, pricing, and API pages all render only a wallet-connect prompt with no further detail. The x402 challenge confirms the endpoint is live and accepts POST requests, settling payments in USDC (contract `0x8335...`) on Base. The max amount required is 20,000 base units, which at 6 decimals equals $0.02 per request, consistent with the site's uniform pricing.\n\nBecause the crawled documentation is essentially empty beyond the landing page listing and the endpoint path suggests ACH (Automated Clearing House) functionality, the actual behavior of this endpoint remains unclear. It may relate to ACH payment processing, bank transfer lookups, or routing number validation, but this is speculative. Users should test the endpoint directly to confirm its output before relying on it in production.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["finance","infrastructure"],"synonyms":["ACH API","bank transfer API","payment processing endpoint","x402 API","USDC micropayment API","lowpaymentfee","automated clearing house"],"warnings":["No documentation available — docs, pricing, and API pages only show a wallet-connect prompt with no content.","The purpose of /api/v1/ach/91 is unknown; 'Premium API Access' is a generic placeholder title.","No input or output schema is provided; callers cannot know what to send or expect back.","The endpoint path suggests ACH (banking) functionality, which may involve regulated financial activity — verify compliance before use."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/91","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, and no explanation of what the ACH endpoint actually does. The docs/pricing/API pages are all blank wallet-connect stubs. This is effectively a stub 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'/request':12,30 '0.02':11,29,173 '000':165 '0x8335':156 '20':164 '6':170 'ACH API' 'USDC micropayment API' 'accept':77,148 'access':103 'ach':5,23,113,200,217 'actual':206 'ai/ml':60 'amount':161 'analyt':59 'api':16,34,56,82,102,125 'autom':201 'automated clearing house' 'bank':220 'bank transfer API' 'base':8,26,75,158,166 'base-network' 'behavior':207 'beyond':190 'call':4,22 'challeng':141 'clear':202 'collect':50 'commit':90 'confirm':142,238 'connect':133 'consist':176 'contract':155 'crawl':185 'crypto':63 'data':58 'decim':171 'detail':138 'direct':236 'doc':122 'document':109,186 'empti':189 'endpoint':6,24,38,68,93,114,144,197,210,235 'equal':172 'essenti':188 'expect':120 'explain':110 'financ':62 'function':204 'generic':99 'hous':203 'infer':61 'input':118 'key':17,35,83 'land':192 'limit':86 'list':96,194 'live':146 'lookup':222 'lowpaymentfee' 'lowpaymentfee.com':45 'max':160 'may':214 'network':76 'no-api-key' 'number':225 'offer':48 'output':240 'page':126,193 'part':42 'path':198 'pay':2,20,53 'pay-per-cal':1,19 'pay-per-request':52 'payment':79,152,218 'payment processing endpoint' 'per':3,21,54,174 'platform':46,105 'post':149 'post-endpoint' 'premium':101 'price':123,182 'process':219 'product':246 'prompt':134 'protocol':72 'provid':108 'rate':85 'relat':215 'reli':242 'remain':211 'render':128 'request':55,150,175 'requir':18,36,162 'return':115 'rout':224 'servic':66 'settl':151 'site':179 'span':57 'specif':92 'specul':230 'suggest':199 'test':233 'titl':100 'transfer':221 'unclear':212 'uniform':181 'unit':167 'upfront':89 'usdc':14,32,78,154 'usdc-settlement' 'use':69 'user':231 'util':65 'valid':226 'via':9,27 'wallet':132 'wallet-connect':131 'x402':10,28,71,140 'x402 API' 'x402-payment'","prices":[{"id":"e92d85a2-3d75-4a61-a6f4-6c86312950b6","listingId":"470cf402-4b34-4077-abff-83a5d438b122","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:27.067Z"}],"sources":[{"listingId":"470cf402-4b34-4077-abff-83a5d438b122","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/91","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:27.067Z","lastSeenAt":"2026-04-27T09:33:30.014Z"}],"details":{"listingId":"470cf402-4b34-4077-abff-83a5d438b122","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/91 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/91"},{"claim":"All APIs are priced at $0.02/request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/91"}],"useCases":["Programmatic access to ACH-related data or functionality via a single paid POST request","Agent-driven financial workflows that need per-call payment without subscription overhead","Exploring x402 protocol integrations on the Base network"],"bestFor":["Developers experimenting with x402 pay-per-call APIs","Agents needing low-cost, keyless API access on Base","Quick one-off ACH-related lookups or operations"],"notFor":["Production ACH payment initiation without verifying endpoint behavior first","Use cases requiring detailed API documentation or guaranteed SLAs","High-volume batch processing where per-call pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:30.333Z"},"updatedAt":"2026-04-27T09:33:30.014Z"}}