{"id":"428c819b-eb86-4fe5-bf1f-98d5f7cca260","shortId":"3my9Mc","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/135` 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/135` path is not documented — the listing title is simply \"Premium API Access\" and the endpoint sits under an `/ach/` path segment, which may relate to ACH (Automated Clearing House) banking or payment processing, but this is unconfirmed.\n\nPricing is $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). The platform advertises no API keys, no rate limits, no minimums, and instant access. Payment is made via the x402 `X-PAYMENT` header using the \"exact\" scheme. The USDC asset contract on Base is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what data or functionality this specific endpoint returns. Prospective users should be aware that the actual behavior of `/api/v1/ach/135` is unknown beyond the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","ach-endpoint"],"categories":["finance","payments"],"synonyms":["ACH API","payment processing API","lowpaymentfee","x402 ACH","USDC pay-per-call","Base network API","automated clearing house API"],"warnings":["The specific functionality of /api/v1/ach/135 is completely undocumented — the 'ach' path segment is suggestive but unconfirmed.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content.","No OpenAPI schema, no request/response examples, and no error documentation are available.","The '135' in the path may be a resource ID whose meaning is unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/135","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/135","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 zero documentation on what this endpoint actually does, no request/response schema, and no examples. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/ach/135':40,86,229 '/request':12,30 '0.02':11,29,126,140 '000':132 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':176 '20':131 '6':138 'ACH API' 'Base network API' 'USDC pay-per-call' 'access':98,154 'ach':5,23,112 'ach-endpoint' 'actual':226 'advertis':143 'ai/ml':60 'analyt':59 'api':16,34,56,97,145,183 'asset':171 'autom':113 'automated clearing house API' 'awar':223 'bank':116 'base':8,26,79,133,174 'base-network' 'behavior':227 'beyond':232 'call':4,22 'challeng':235 'clear':114 'collect':50 'connect':192 'content':198 'contract':172 'crypto':63 'data':58,212 'decim':139 'descript':209 'doc':182 'document':90,177 'endpoint':6,24,38,68,101,217 'exact':167 'exampl':206 'extrem':179 'financ':62 'function':83,214 'header':164 'hous':115 'infer':61 'instant':153 'key':17,35,146 'limit':149 'list':92 'lowpaymentfee' 'lowpaymentfee.com':45 'made':157 'maxamountrequir':129 'may':109 'metadata':236 'minimum':151 'network':80 'no-api-key' 'offer':48 'openapi':202 'page':187 'part':42 'path':87,106 'pay':2,20,53 'pay-per-cal':1,19 'pay-per-request':52 'payment':72,118,155,163 'payment processing API' 'per':3,21,54,127 'platform':46,142 'premium':96 'price':124,184 'process':119 'prompt':194 'prospect':219 'protocol':73 'rate':148 'readm':186 'relat':110 'render':189 'request':55,128 'request/response':205 'requir':18,36 'return':218 'schema':203 'scheme':168 'segment':107 'servic':66 'settl':74 'simpli':95 'sit':102 'span':57 'spars':180 'specif':82,216 'titl':93 'unconfirm':123 'unit':134 'unknown':231 'usdc':14,32,76,136,170 'usdc-settlement' 'use':69,165 'user':220 'util':65 'via':9,27,158 'wallet':193 'x':162 'x-payment':161 'x402':10,28,71,160,234 'x402 ACH' 'x402-payment'","prices":[{"id":"96231db4-bdb6-4e15-9f4c-efe8d3325d17","listingId":"428c819b-eb86-4fe5-bf1f-98d5f7cca260","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/135","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:54.851Z"}],"sources":[{"listingId":"428c819b-eb86-4fe5-bf1f-98d5f7cca260","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/135","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:54.851Z","lastSeenAt":"2026-04-25T00:03:53.155Z"}],"details":{"listingId":"428c819b-eb86-4fe5-bf1f-98d5f7cca260","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/135 \\\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","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/ach/135"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/135"},{"claim":"Platform offers APIs across data analytics, AI/ML, finance, crypto, and utility categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to an ACH-related service with per-call USDC micropayments","Agent-driven payment workflows that settle on Base L2","Integrating pay-as-you-go financial endpoints without managing API keys"],"bestFor":["Developers wanting keyless, pay-per-request API access on Base","AI agents with USDC wallets needing on-demand financial endpoints","Prototyping x402 payment flows with low per-call costs"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up without bulk discounts","Anyone needing fiat-only payment rails with no crypto involvement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.811Z"},"updatedAt":"2026-04-25T00:03:53.155Z"}}