{"id":"68b68ca2-1e18-4fe6-bf9c-78c379bad545","shortId":"UGwCpk","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/52` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific function of the `/api/v1/ach/52` route is not documented — the path suggests it may relate to ACH (Automated Clearing House) payment processing or data lookup, but no schema, request/response examples, or dedicated documentation were found for this particular endpoint. The platform's homepage lists it under a generic \"Premium API Access\" label.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled on Base in USDC (contract `0x8335…2913`) with a max amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). This is consistent with the site-wide $0.02/request pricing advertised on the homepage. No API keys are needed; access is gated entirely by the x402 payment header. The platform advertises no rate limits and instant access.\n\nThe broader lowpaymentfee.com platform offers endpoints across data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/crypto (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). However, documentation pages (`/docs`, `/pricing`, `/README`) returned only a \"Connect wallet\" prompt with no substantive content, so details about request formats, response schemas, and actual functionality behind each route remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","ach-endpoint","post-method"],"categories":["finance","payments"],"synonyms":["ACH API","ACH payment endpoint","automated clearing house API","low fee payment API","x402 ACH","USDC pay-per-call","Base network API"],"warnings":["No documentation exists for /api/v1/ach/52 — the endpoint's actual functionality is unknown","All documentation pages (/docs, /pricing, /README) returned only a 'Connect wallet' prompt with no content","The 'ACH' path component suggests financial/payment functionality which may be subject to regulatory requirements","No request or response schema is available; callers cannot know what input is expected or what output is returned","The platform lists many diverse endpoints (AI, finance, geo, etc.) all at $0.02 — unclear if these are fully implemented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/52","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/52","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/request in USDC on Base), but there is zero documentation for this specific endpoint — no request schema, no response schema, no description of what /api/v1/ach/52 actually does. All doc pages returned only 'Connect wallet' with no 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'/docs':227 '/pricing':228 '/readme':229 '/request':12,30,169 '0.02':11,29,155,168 '000':150 '0x8335':142 '20':149 '2913':143 '6':158 'ACH API' 'ACH payment endpoint' 'Base network API' 'USDC pay-per-call' 'accept':131 'access':120,180,197 'ach':5,23,86 'ach-endpoint' 'across':204 'actual':248 'advertis':171,191 'ai/ml':206 'amount':147 'api':16,34,57,119,176 'autom':87 'automated clearing house API' 'base':8,26,65,138,151 'base-network' 'behind':250 'broad':50 'broader':199 'call':4,22 'catalog':51 'challeng':124 'classif':209 'clear':88 'confirm':125 'connect':233 'consist':162 'content':239 'contract':141 'convers':223 'data':93 'data/analytics':205 'decim':159 'dedic':101 'detail':241 'document':78,102,225 'embed':210 'endpoint':6,24,38,108,127,203 'entir':183 'equal':154 'estim':217 'exampl':99 'exchang':214 'feed':213 'finance/crypto':211 'format':244 'found':104 'function':71,249 'gas':216 'gate':182 'generic':117 'geocod':221 'header':188 'homepag':112,174 'hous':89 'howev':224 'infrastructur':219 'instant':196 'key':17,35,177 'label':121 'limit':194 'list':113 'live':129 'lookup':94 'low fee payment API' 'lowpaymentfee.com':45,200 'max':146 'may':83 'need':179 'network':66 'no-api-key' 'offer':48,202 'page':226 'part':42 'particular':107 'path':80 'pay':2,20,54 'pay-per-cal':1,19 'pay-per-request':53 'payment':90,134,187 'per':3,21,55 'platform':46,110,190,201 'post':132 'post-method' 'premium':118 'price':170,212 'process':91 'prompt':235 'protocol':62 'rate':193,215 'relat':84 'remain':253 'request':56,133,243 'request/response':98 'requir':18,36 'respons':245 'return':230 'rout':75,252 'schema':97,246 'sentiment':207 'settl':58,136 'site':166 'site-wid':165 'specif':70 'substant':238 'suggest':81 'summar':208 'unit':152 'unknown':254 'usdc':14,32,68,140,156 'usdc-settlement' 'use':67,157 'util':220 'valid':222 'via':9,27,59 'wallet':234 'wide':167 'x402':10,28,61,123,186 'x402 ACH' 'x402-payment'","prices":[{"id":"22360384-35ee-4d49-ad62-d5a2f4b8e9b9","listingId":"68b68ca2-1e18-4fe6-bf9c-78c379bad545","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/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:13.738Z"}],"sources":[{"listingId":"68b68ca2-1e18-4fe6-bf9c-78c379bad545","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/52","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:13.738Z","lastSeenAt":"2026-04-24T22:32:11.629Z"}],"details":{"listingId":"68b68ca2-1e18-4fe6-bf9c-78c379bad545","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/52 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/52"},{"claim":"Site-wide pricing is $0.02/request 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/52"},{"claim":"Documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic ACH payment data retrieval or initiation via a single pay-per-call model","Agent-driven financial workflows that need ACH-related functionality without subscription overhead","Integrating ACH capabilities into crypto-native applications settled on Base"],"bestFor":["Developers wanting zero-commitment, pay-per-use ACH-related API access","AI agents that can settle x402 payments autonomously on Base","Projects needing quick ACH endpoint access without API key management"],"notFor":["Production ACH payment processing requiring documented SLAs and compliance guarantees","Use cases needing detailed API documentation, request/response schemas, or sandbox testing","High-volume ACH operations where per-request pricing may not be cost-effective"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:30.953Z"},"updatedAt":"2026-04-24T22:32:11.629Z"}}