{"id":"a849ddfe-f031-4954-a309-e147e07cf90c","shortId":"LNGf9m","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/53` 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 endpoint is listed under \"Premium API Access\" but its exact functionality is unclear — the path suggests ACH (Automated Clearing House) payment-related data or operations, though no documentation beyond the endpoint title is available. The platform advertises a flat $0.02 per request across all its endpoints.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled on-chain on Base using USDC (contract `0x8335...2913`) with a max amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The payment scheme is \"exact\" with a 300-second timeout. No API keys or rate limits are advertised — access is gated purely by the x402 micropayment.\n\nThe broader lowpaymentfee.com platform lists endpoints across data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). However, the `/api/v1/ach/53` endpoint does not appear in the publicly listed catalog on the homepage, and no schema, request/response examples, or detailed documentation were found for it. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","ach-related"],"categories":["finance","payments"],"synonyms":["ACH API","payment processing API","x402 micropayment","USDC pay-per-call","lowpaymentfee","automated clearing house","Base network API"],"warnings":["No documentation found — docs, pricing, API, and README pages all return only a 'Connect wallet' prompt with no content.","The /api/v1/ach/53 endpoint is not listed in the site's public API catalog; its purpose is unclear.","No request or response schema is available; input/output formats are unknown.","The 'Premium API Access' title is generic and does not describe the endpoint's function."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/53","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/53","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 USDC on Base), but there is no documentation, no request/response schema, and no explanation of what the /api/v1/ach/53 endpoint actually does. The endpoint is not listed in the site's public catalog. This is effectively a stub 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'/request':12,30 '0.02':11,29,111,154 '000':149 '0x8335':141 '20':148 '2913':142 '300':166 '6':157 'ACH API' 'Base network API' 'USDC pay-per-call' 'accept':127 'access':77,177 'ach':5,23,87 'ach-related' 'across':114,191 'advertis':108,176 'ai/ml':194 'amount':146 'analysi':196 'analyt':193 'api':16,34,57,76,170,248 'appear':223 'autom':88 'automated clearing house' 'avail':105 'base':8,26,65,137,150 'base-network' 'beyond':100 'broad':50 'broader':186 'call':4,22 'catalog':51,228 'chain':135 'challeng':120 'classif':198 'clear':89 'confirm':121 'connect':254 'content':260 'contract':140 'convers':215 'data':94,192 'decim':158 'detail':238 'doc':245 'document':99,239 'embed':199 'endpoint':6,24,38,71,102,117,123,190,220 'equal':153 'estim':209 'exact':80,163 'exampl':236 'exchang':204 'feed':203 'financ':200 'flat':110 'found':241 'function':81 'gas':208 'gate':179 'generat':216 'geocod':213 'homepag':231 'hous':90 'howev':217 'infrastructur':211 'key':17,35,171 'limit':174 'list':73,189,227 'live':125 'lowpaymentfee' 'lowpaymentfee.com':45,187 'max':145 'micropay':184 'network':66 'no-api-key' 'offer':48 'on-chain':133 'oper':96 'page':249 'part':42 'path':85 'pay':2,20,54 'pay-per-cal':1,19 'pay-per-request':53 'payment':92,130,160 'payment processing API' 'payment-rel':91 'per':3,21,55,112 'platform':46,107,188 'post':128 'premium':75 'price':202,246 'prompt':256 'protocol':62 'public':226 'pure':180 'quot':207 'rate':173,205 'relat':93 'request':56,113,129 'request/response':235 'requir':18,36 'return':251 'schema':234 'scheme':161 'second':167 'sentiment':195 'settl':58,132 'specif':70 'substant':259 'suggest':86 'summar':197 'though':97 'timeout':168 'titl':103 'token':206 'unclear':83 'unit':151 'usdc':14,32,68,139,155 'usdc-settlement' 'use':67,138,156 'util':212 'valid':214 'via':9,27,59 'wallet':255 'web3':201 'x402':10,28,61,119,183 'x402 micropayment' 'x402-payment'","prices":[{"id":"334165d3-25f1-44ad-ba73-7d35d527ad0c","listingId":"a849ddfe-f031-4954-a309-e147e07cf90c","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:17.425Z"}],"sources":[{"listingId":"a849ddfe-f031-4954-a309-e147e07cf90c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:17.425Z","lastSeenAt":"2026-04-24T22:32:11.790Z"}],"details":{"listingId":"a849ddfe-f031-4954-a309-e147e07cf90c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/53 \\\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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/53"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/53"},{"claim":"Docs, pricing, API, and README pages returned only 'Connect wallet' with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing ACH-related data or operations on a per-call basis without subscription","Agent-driven payment workflows where per-request USDC micropayments replace API keys","Integrating low-cost financial endpoints into automated pipelines"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go ACH-related API access","AI agents that can settle x402 payments autonomously on Base","Projects needing quick, keyless access to financial endpoints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing may add up compared to bulk plans","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:30.716Z"},"updatedAt":"2026-04-24T22:32:11.790Z"}}