{"id":"c815461d-ba6e-49f2-8cc2-1315d88dd1d4","shortId":"WSLeQr","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/44` 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/44` path is not documented — the provider labels it generically as \"Premium API Access\" — so its exact purpose is unclear. It may relate to ACH (Automated Clearing House) payment processing or financial data, but this is speculative based solely on the URL path.\n\nPricing is $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). Payment is made via the x402 `exact` scheme to the specified wallet address on Base. The platform advertises no API keys, no rate limits, and instant access. However, documentation is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint accepts or returns beyond `application/json` via POST.\n\nThe endpoint is live and responding with a proper 402 challenge, confirming it is operational on the x402 protocol. However, the lack of documentation about what this endpoint actually does is a significant limitation for both human developers and AI agents.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","low fee API","x402 endpoint","USDC pay-per-call","Base network API","micropayment API"],"warnings":["The exact function of /api/v1/ach/44 is unknown — 'Premium API Access' is a generic label applied across the platform","No OpenAPI schema, request examples, or response examples are available","All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no substantive content","The 'ACH' in the path may imply regulated financial services (Automated Clearing House) — verify compliance requirements before use"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/44","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/44","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 this specific endpoint does, what inputs it expects, or what it returns. The docs/pricing/README pages are all empty beyond a wallet connect prompt. The endpoint path suggests ACH-related functionality but this is purely inferred from the 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'/request':12,30 '0.02':11,29,131,145 '000':137 '20':136 '402':228 '6':143 'ACH API' 'Base network API' 'USDC pay-per-call' 'accept':212 'access':99,172 'ach':5,23,110 'actual':247 'address':158 'advertis':163 'agent':259 'ai':258 'ai/ml':60 'analyt':59 'api':16,34,56,98,165,181 'application/json':216 'autom':111 'base':8,26,79,123,138,160 'base-network' 'beyond':215 'call':4,22 'challeng':229 'clear':112 'collect':50 'confirm':230 'connect':189 'content':195 'crypto':63 'data':58,118 'decim':144 'descript':206 'develop':256 'doc':179 'document':90,174,242 'endpoint':6,24,38,68,211,220,246 'exact':102,152 'exampl':203 'extrem':176 'financ':62 'financi':117 'function':83 'generic':95 'hous':113 'howev':173,238 'human':255 'infer':61 'instant':171 'json-response' 'key':17,35,166 'label':93 'lack':240 'limit':169,252 'live':222 'low fee API' 'lowpaymentfee.com':45 'made':148 'maxamountrequir':134 'may':107 'micropayment API' 'network':80 'no-api-key' 'offer':48 'openapi':199 'oper':233 'page':184 'part':42 'path':87,128 'pay':2,20,53 'pay-per-cal':1,19 'pay-per-request':52 'payment':72,114,146 'payment API' 'per':3,21,54,132 'platform':46,162 'post':218 'post-endpoint' 'premium':97 'price':129,180 'process':115 'prompt':191 'proper':227 'protocol':73,237 'provid':92 'purpos':103 'rate':168 'readm':183 'relat':108 'render':186 'request':55,133 'request/response':202 'requir':18,36 'respond':224 'return':214 'schema':200 'scheme':153 'servic':66 'settl':74 'signific':251 'sole':124 'span':57 'specif':82,210 'specifi':156 'specul':122 'substant':194 'thin':177 'unclear':105 'unit':139 'url':127 'usdc':14,32,76,141 'usdc-settlement' 'use':69 'util':65 'via':9,27,149,217 'wallet':157,190 'x402':10,28,71,151,236 'x402 endpoint' 'x402-payment'","prices":[{"id":"8bf9aea0-5491-45e2-af1a-46b871d619ef","listingId":"c815461d-ba6e-49f2-8cc2-1315d88dd1d4","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:34.665Z"}],"sources":[{"listingId":"c815461d-ba6e-49f2-8cc2-1315d88dd1d4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:34.665Z","lastSeenAt":"2026-04-27T22:32:47.202Z"}],"details":{"listingId":"c815461d-ba6e-49f2-8cc2-1315d88dd1d4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/44 \\\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":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/ach/44"},{"claim":"The platform offers APIs across data analytics, AI/ML, finance/crypto, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to an ACH-related service with per-call USDC micropayments","Agent-driven API consumption without pre-registration or API key management","Integrating pay-as-you-go financial endpoints into automated workflows"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents that can settle x402 payments on Base","Users needing low-cost per-request pricing without subscriptions"],"notFor":["Anyone needing detailed API documentation or request/response schemas before integrating","Users who cannot transact in USDC on the Base network","High-volume consumers who need bulk pricing or SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.705Z"},"updatedAt":"2026-04-27T22:32:47.202Z"}}