{"id":"7e705c48-dd41-43f8-9c77-f1e17bd67ac8","shortId":"ZpkRr9","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/35` 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 payment protocol, settling in USDC on the Base network. The specific function of the `/api/v1/ach/35` path is not documented — the listing title is simply \"Premium API Access\" and the endpoint sits under an `/ach/` path prefix that doesn't appear in the site's published API catalog. It may relate to ACH (Automated Clearing House) banking data or payment processing, but this is speculative.\n\nPricing is $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02). Payment is made via the x402 `X-PAYMENT` header using the \"exact\" scheme on Base mainnet, settling to USDC contract `0x8335…2913`. There are no API keys, no rate limits, and no signup required — callers simply attach a valid x402 payment header to each POST request. The maximum timeout for payment settlement is 300 seconds.\n\nDocumentation is extremely sparse. The site's docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no description of what this specific endpoint accepts or returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation the actual functionality cannot be verified.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","lowpaymentfee","x402 API","USDC micropayment","Base network API","pay-per-call API"],"warnings":["The /api/v1/ach/35 path does not appear in the provider's published API catalog — its actual function is unknown.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.","No request or response schema is available; callers cannot know what to send or expect back.","The 'ACH' path prefix may imply regulated financial services (ACH payments), but this is unconfirmed."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/35","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on what /api/v1/ach/35 actually does, what it accepts, or what it returns. No OpenAPI spec, no examples, and the docs pages are empty. The endpoint path doesn't appear in the site's own API catalog, making its purpose 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'/api/v1/ach/35':40,86 '/request':12,30 '0.02':11,29,138,150 '000':142 '0x8335':172 '20':141 '2913':173 '300':205 '402':258 '6':148 'ACH API' 'Base network API' 'USDC micropayment' 'accept':247 'access':98 'ach':5,23,123 'actual':264 'addit':229 'ai/ml':60 'analyt':59 'api':16,34,56,97,117,177,216 'appear':111 'attach':188 'autom':124 'bank':127 'base':8,26,79,143,166 'base-network' 'call':4,22 'caller':186 'cannot':266 'catalog':118 'challeng':259 'clear':125 'collect':50 'confirm':253 'connect':224 'content':230 'contract':171 'crypto':63 'data':58,128 'decim':149 'descript':241 'doc':214 'document':90,207,262 'doesn':109 'endpoint':6,24,38,68,101,246,251 'exact':163 'extrem':209 'financ':62 'function':83,265 'header':160,193 'hous':126 'infer':61 'key':17,35,178 'limit':181 'list':92 'live':254 'lowpaymentfee' 'lowpaymentfee.com':45 'made':153 'mainnet':167 'maximum':199 'may':120 'network':80 'no-api-key' 'offer':48 'openapi':234 'page':219 'part':42 'path':87,106 'pay':2,20,53 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':52 'payment':72,130,151,159,192,202 'payment API' 'per':3,21,54,139 'platform':46 'post':196 'post-endpoint' 'prefix':107 'premium':96 'price':136,215 'process':131 'prompt':226 'proper':257 'protocol':73 'publish':116 'rate':180 'readm':218 'relat':121 'render':221 'request':55,140,197 'request/response':237 'requir':18,36,185 'return':249,255 'schema':238 'scheme':164 'second':206 'servic':66 'settl':74,168 'settlement':203 'signup':184 'simpli':95,187 'sit':102 'site':114,212 'span':57 'spars':210 'spec':235 'specif':82,245 'specul':135 'timeout':200 'titl':93 'unit':144 'usdc':14,32,76,146,170 'usdc-settlement' 'use':69,161 'util':65 'valid':190 'verifi':268 'via':9,27,154 'wallet':225 'without':261 'x':158 'x-payment':157 'x402':10,28,71,156,191 'x402 API' 'x402-payment'","prices":[{"id":"b5ae45b7-04ab-4e4a-9042-98014a76d79b","listingId":"7e705c48-dd41-43f8-9c77-f1e17bd67ac8","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:32.264Z"}],"sources":[{"listingId":"7e705c48-dd41-43f8-9c77-f1e17bd67ac8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:32.264Z","lastSeenAt":"2026-04-27T22:32:47.105Z"}],"details":{"listingId":"7e705c48-dd41-43f8-9c77-f1e17bd67ac8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/35 \\\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":"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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/35"},{"claim":"Payment settles to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/35"},{"claim":"The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a pay-per-call ACH-related endpoint without API key management","Integrating x402 micropayments into agent workflows on Base","Making on-demand API calls settled in USDC with no subscription"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native micropayment rails over traditional billing"],"notFor":["Anyone needing documented request/response schemas before integration","High-volume use cases where per-request pricing may add up","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.822Z"},"updatedAt":"2026-04-27T22:32:47.105Z"}}