{"id":"7a21054e-1312-427c-acdf-239f3e032f67","shortId":"MDqffq","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/ach/33` is listed as \"Premium API Access\" and accepts POST requests. Payment is made per-call with no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe x402 challenge captured from this endpoint specifies a maxAmountRequired of 20,000 base units of USDC (contract 0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. The payment timeout is 300 seconds.\n\nThe broader lowpaymentfee.com platform offers endpoints across several categories including 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 specific functionality behind `/api/v1/ach/33` is not documented beyond the generic \"Premium API Access\" label. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl — the docs, API, pricing, and README 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","post-endpoint"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","low fee API","x402 endpoint","USDC API","Base network API","pay-per-call API","micropayment API"],"warnings":["The specific functionality of /api/v1/ach/33 is undocumented — 'Premium API Access' is the only description available","No OpenAPI schema, request body format, or response examples are provided anywhere","All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no substantive content","The 'ach' path segment suggests ACH (Automated Clearing House) banking functionality, but this is unconfirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/33","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind '/api/v1/ach/33' is completely undocumented. The docs pages returned only 'Connect wallet' with no 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'/request':12,30,144 '0.02':11,29,131,143 '000':113 '0x8335':119 '20':112 '2913':120 '300':152 '6':126 'ACH API' 'Base network API' 'USDC API' 'accept':71 'access':69,201 'ach':5,23 'across':145,160 'advertis':139 'ai/ml':165 'analysi':167 'api':16,34,46,68,82,200,218 'attach':93 'base':8,26,55,114,122 'base-network' 'behind':191 'beyond':196 'broader':155 'call':4,22,79 'caller':91 'captur':104 'categori':162 'challeng':103 'classif':169 'collect':40 'commit':90 'connect':227 'consist':134 'content':233 'contract':118 'convers':185 'crawl':215 'data/analytics':164 'decim':127 'detail':209 'doc':217 'document':195,210 'embed':170 'endpoint':6,24,47,61,107,147,159 'estim':179 'exampl':207 'exchang':174 'feed':173 'finance/web3':171 'flat':140 'found':212 'function':190 'gas':178 'generat':186 'generic':198 'geocod':183 'header':97 'host':38 'howev':187 'includ':163 'infrastructur':181 'key':17,35,83 'label':202 'limit':86 'list':65 'low fee API' 'lowpaymentfee.com':37,156 'made':76 'maxamountrequir':110 'micropayment API' 'network':56 'no-api-key' 'offer':158 'openapi':204 'page':222 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':74,96,149 'payment API' 'per':3,21,44,78,132 'per-cal':77 'platform':157 'post':72 'post-endpoint' 'premium':67,199 'price':141,172,219 'prompt':229 'protocol':52 'quot':177 'rate':85,175 'readm':221 'request':45,73,100,133 'request/response':206 'requir':18,36 'return':224 'schema':205 'second':153 'sentiment':166 'settl':48 'sever':161 'simpli':92 'sinc':123 'site':137 'specif':60,189 'specifi':108 'substant':232 'summar':168 'timeout':150 'token':176 'translat':129 'unit':115 'upfront':89 'usdc':14,32,58,117,124 'usdc-settlement' 'use':57,125 'util':182 'valid':184 'via':9,27,49 'wallet':228 'x402':10,28,51,95,102 'x402 endpoint' 'x402-payment'","prices":[{"id":"4e5eba53-da31-4ae8-b301-60a8e6d325c1","listingId":"7a21054e-1312-427c-acdf-239f3e032f67","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:31.677Z"}],"sources":[{"listingId":"7a21054e-1312-427c-acdf-239f3e032f67","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:31.677Z","lastSeenAt":"2026-04-27T22:32:47.103Z"}],"details":{"listingId":"7a21054e-1312-427c-acdf-239f3e032f67","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/33 \\\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":"Flat pricing of $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/ach/33"},{"claim":"Platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to ACH-related data or operations at $0.02 per call","Agent-driven workflows requiring low-cost, keyless API access on Base","Integrating pay-per-use endpoints without subscription overhead"],"bestFor":["Developers wanting keyless, pay-per-request API access","AI agents that can settle x402 payments in USDC on Base","Use cases requiring low-cost, no-commitment API calls"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume callers who would benefit from bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.858Z"},"updatedAt":"2026-04-27T22:32:47.103Z"}}