{"id":"0a7dc1de-fc13-4d07-b1dc-3e7cf476888a","shortId":"yDTbB3","kind":"x402","title":"Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys required.","tagline":"Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys required.","description":"This endpoint at `/api/v1/ach/143` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific function of the `/api/v1/ach/143` path is not documented — the listing title is simply \"Premium API Access\" and the endpoint lives under an `/ach/` path segment, which may relate to ACH (Automated Clearing House) banking data or operations, but this is unconfirmed.\n\nThe x402 challenge is live and returns a 402 with an `exact` payment scheme requiring up to 20,000 base units of USDC (0x8335…on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nDocumentation is extremely sparse. The `/docs`, `/api`, `/pricing`, and `/README` pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what data or functionality this specific endpoint provides. The site lists many endpoints across categories but does not document their inputs or outputs.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","lowpaymentfee","x402 endpoint","USDC micropayment API","Base network API","pay-per-call API"],"warnings":["The specific function of /api/v1/ach/143 is undocumented — the 'ACH' path segment is suggestive but unconfirmed.","All documentation pages (/docs, /api, /pricing, /README) return only a 'Connect wallet' prompt with no usable content.","No OpenAPI schema, request format, or response examples are available.","If this endpoint relates to real ACH banking operations, it may fall under financial regulation (e.g., money transmission laws)."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/143","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/143","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this endpoint actually does, no request/response schema, and no examples. The /ach/143 path purpose is unknown. Effectively a stub 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'/api':202 '/api/v1/ach/143':40,86 '/call':12,30 '/docs':201 '/pricing':203 '/readme':205 '0.02':11,29,158 '000':142 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':173 '0x8335':147 '20':141 '300':176 '402':132 '6':153 'ACH API' 'Base network API' 'USDC micropayment API' 'access':98,187 'ach':5,23,112 'across':243 'addit':216 'advertis':166,186 'ai/ml':60 'analyt':59 'api':16,34,56,97,180 'autom':113 'bank':116 'base':8,26,79,143,149 'base-network' 'call':55 'categori':244 'challeng':126 'clear':114 'collect':50 'connect':211 'consist':161 'content':217 'crypto':63 'data':58,117,231 'decim':154 'descript':228 'document':90,196,248 'endpoint':6,24,38,68,101,236,242 'exact':135 'exampl':225 'extrem':198 'financ':62 'flat':167 'function':83,233 'grant':189 'header':195 'hous':115 'http-post' 'infer':61 'input':250 'key':17,35,181 'limit':184 'list':92,240 'live':102,128 'lowpaymentfee' 'lowpaymentfee.com':45 'mani':241 'may':109 'network':80 'no-api-key' 'offer':48 'openapi':221 'oper':119 'output':252 'page':206 'part':42 'path':87,106 'pay':2,20,53 'pay-per-cal':52 'pay-per-call API' 'pay-per-request':1,19 'payment':72,136,169,194 'payment API' 'per':3,21,54,159 'platform':46 'premium':96 'price':168 'prompt':213 'protocol':73 'provid':237 'pure':190 'rate':183 'relat':110 'render':208 'request':4,22,160 'request/response':224 'requir':18,36,138 'return':130 'schema':222 'scheme':137 'second':177 'segment':107 'sent':171 'servic':66 'settl':74 'simpli':95 'sinc':150 'site':164,239 'span':57 'spars':199 'specif':82,235 'timeout':178 'titl':93 'translat':156 'unconfirm':123 'unit':144 'usdc':14,32,76,146,151 'usdc-settlement' 'use':69,152 'util':65 'via':9,27 'wallet':212 'x402':10,28,71,125,193 'x402 endpoint' 'x402-payment'","prices":[{"id":"326d2231-4779-4654-b1ef-80ed4355e16a","listingId":"0a7dc1de-fc13-4d07-b1dc-3e7cf476888a","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/143","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:58.520Z"}],"sources":[{"listingId":"0a7dc1de-fc13-4d07-b1dc-3e7cf476888a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/143","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:58.520Z","lastSeenAt":"2026-04-27T15:05:15.897Z"}],"details":{"listingId":"0a7dc1de-fc13-4d07-b1dc-3e7cf476888a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/143 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site advertises $0.02 per request flat pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requires up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/ach/143"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to an ACH-related endpoint with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API key management","Integrating pay-as-you-go API calls into crypto-native workflows on Base"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","Crypto-native agents that can settle USDC on Base","Exploratory or low-volume usage where flat $0.02/call pricing is attractive"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.624Z"},"updatedAt":"2026-04-27T15:05:15.897Z"}}