{"id":"8ad745d8-05c5-40ef-8683-1b7f8a268667","shortId":"Yn6E34","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/138` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network at $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe specific function of the `/api/v1/ach/138` endpoint is not documented beyond the generic label \"Premium API Access.\" The path segment \"ach\" may suggest ACH (Automated Clearing House) banking or payment-related functionality, and \"138\" could be a resource or route identifier, but no schema, request/response examples, or detailed documentation were found. The docs, pricing, API, and README pages on the site all render only a \"Connect wallet\" prompt with no additional technical content.\n\nThe endpoint is confirmed live: it returns a proper x402 challenge (HTTP 402) with an `exact` payment scheme, accepting USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base, payable to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The method is POST and the response MIME type is `application/json`. Without further documentation, the actual request body format and response structure remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","lowpaymentfee","x402 endpoint","USDC micropayment","Base network API","premium API access"],"warnings":["The specific functionality of /api/v1/ach/138 is undocumented; 'Premium API Access' is a generic label applied across the platform.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content.","No request body schema or response schema is available — callers must guess or reverse-engineer the API.","The 'ach' path segment suggests possible financial/banking functionality, which may fall under regulated categories."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/138","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/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation for this specific endpoint — no request/response schema, no description of what 'ach/138' actually does, and the site's docs pages are empty. The listing is essentially a stub with pricing 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'/request':12,30 '0.02':11,29,82 '000':86 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':211 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':206 '138':146 '20':85 '402':198 '6':90 'ACH API' 'Base network API' 'USDC micropayment' 'accept':204 'access':128 'ach':5,23,132,135 'actual':227 'addit':183 'ai/ml':61 'analyt':60 'api':16,34,57,93,127,167 'application/json':222 'attach':104 'autom':136 'bank':139 'base':8,26,79,87,208 'beyond':122 'bodi':229 'broad':50 'call':4,22 'caller':102 'catalog':51 'challeng':196 'clear':137 'commit':99 'confirm':189 'connect':178 'content':185 'could':147 'data':59 'decim':91 'detail':160 'doc':165 'document':121,161,225 'endpoint':6,24,38,68,118,187 'exact':201 'exampl':158 'finance/web3':63 'format':230 'found':163 'function':114,144 'generic':124 'header':108 'hous':138 'http':197 'identifi':153 'infer':62 'infrastructur':65 'json-response' 'key':17,35,94 'label':125 'limit':96 'live':190 'lowpaymentfee' 'lowpaymentfee.com':45 'may':133 'method':213 'mime':219 'network':80 'no-api-key' 'offer':48 'page':170 'part':42 'path':130 'pay':2,20,54 'pay-per-cal':1,19 'pay-per-request':53 'payabl':209 'payment':72,107,142,202 'payment API' 'payment-rel':141 'per':3,21,55,83 'platform':46 'post':215 'post-method' 'premium':126 'premium API access' 'price':166 'prompt':180 'proper':194 'protocol':73 'rate':95 'readm':169 'relat':143 'remain':234 'render':175 'request':56,84,111,228 'request/response':157 'requir':18,36,101 'resourc':150 'respons':218,232 'return':192 'rout':152 'schema':156 'scheme':203 'segment':131 'settl':74 'simpli':103 'site':173 'span':58 'specif':113 'structur':233 'suggest':134 'technic':184 'type':220 'unit':88 'unknown':235 'upfront':98 'usdc':14,32,76,205 'usdc-base' 'use':69 'util':66 'via':9,27 'wallet':179 'without':223 'x402':10,28,71,106,195 'x402 endpoint' 'x402-payment'","prices":[{"id":"3e75b2d0-6f23-4687-843a-cc7f0674e75a","listingId":"8ad745d8-05c5-40ef-8683-1b7f8a268667","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/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:53.046Z"}],"sources":[{"listingId":"8ad745d8-05c5-40ef-8683-1b7f8a268667","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/138","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:53.046Z","lastSeenAt":"2026-04-27T15:05:15.603Z"}],"details":{"listingId":"8ad745d8-05c5-40ef-8683-1b7f8a268667","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/138 \\\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/138"},{"claim":"All APIs on the platform are priced at $0.02 per 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/138"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to an ACH-related or payment-related service via micropayment","Agent-driven API consumption without pre-registration or API keys","Integrating pay-per-call endpoints into automated workflows on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments in USDC on Base","Prototyping workflows that need instant, keyless API calls"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who need bulk pricing or subscription plans","Anyone requiring non-USDC or non-Base payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.894Z"},"updatedAt":"2026-04-27T15:05:15.603Z"}}