{"id":"f0211689-9a16-4edd-8164-d867912c291b","shortId":"uk5TVG","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/20` is listed under \"Premium API Access\" and accepts HTTP POST requests. Payment is made per-call with no API keys, no rate limits, and no upfront commitments.\n\nThe x402 challenge confirms the endpoint is live, requiring a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals) per request, which equals $0.02 USD. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds. The broader lowpaymentfee.com platform advertises endpoints across data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation), all at the same $0.02 per request price point.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/ach/20` endpoint actually returns or what input it expects beyond HTTP POST with JSON content type. The endpoint name suggests ACH (Automated Clearing House) payment-related functionality, but this cannot be confirmed from available materials.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post","json-response"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment processing API","x402 endpoint","USDC micropayment API","lowpaymentfee","pay-per-call API","Base network API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet' with no content","No OpenAPI or input/output schema provided; the actual function of /api/v1/ach/20 is unknown","Endpoint name suggests ACH (banking) functionality which may involve regulated financial operations — use with caution","No request or response examples available anywhere in crawled materials"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/20","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/20","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 confirms pricing and network details, but there is zero documentation on what this endpoint actually does, what inputs it accepts, or what it returns. No OpenAPI schema, no examples, and all doc pages are empty. The listing is effectively a 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'/api/v1/ach/20':63,209 '/docs':178 '/pricing':180 '/readme':182 '/request':12,30 '0.02':11,29,120,168 '000':105 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':128 '0x8335':110 '20':104 '2913':111 '300':133 '6':114 'ACH API' 'Base network API' 'USDC micropayment API' 'accept':71 'access':69 'ach':5,23,229 'across':141 'actual':211 'address':127 'advertis':139 'ai/ml':143 'api':16,34,46,68,83 'autom':230 'avail':243 'base':8,26,55,106,113 'base-network' 'beyond':218 'broader':136 'call':4,22,80 'cannot':239 'challeng':94 'classif':146 'clear':231 'collect':40 'commit':91 'confirm':95,241 'connect':188 'content':194,223 'convers':162 'data/analytics':142 'decim':115 'descript':205 'document':173 'embed':147 'endpoint':6,24,47,61,97,140,210,226 'equal':119 'estim':156 'exampl':202 'exchang':151 'expect':217 'extrem':175 'feed':150 'finance/web3':148 'function':236 'gas':155 'generat':163 'geocod':160 'host':38 'hous':232 'http':72,219 'http-post' 'infrastructur':158 'input':215 'json':222 'json-response' 'key':17,35,84 'limit':87 'list':65 'live':99 'lowpaymentfee' 'lowpaymentfee.com':37,137 'made':77 'materi':244 'maximum':102 'name':227 'network':56 'no-api-key' 'openapi':198 'page':183 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':75,123,234 'payment processing API' 'payment-rel':233 'per':3,21,44,79,116,169 'per-cal':78 'platform':138 'point':172 'post':73,220 'premium':67 'price':149,171 'prompt':190 'protocol':52 'quot':154 'rate':86,152 'relat':235 'render':185 'request':45,74,117,170 'request/response':201 'requir':18,36,100 'return':212 'schema':199 'second':134 'sent':125 'sentiment':144 'settl':48 'spars':176 'specif':60 'suggest':228 'summar':145 'timeout':131 'token':153 'type':224 'unit':107 'upfront':90 'usd':121 'usdc':14,32,58,109 'usdc-settlement' 'use':57 'util':159 'valid':161 'via':9,27,49 'wallet':189 'x402':10,28,51,93 'x402 endpoint' 'x402-payment'","prices":[{"id":"9c93dad2-ad0b-4679-b0c2-deab82ac907a","listingId":"f0211689-9a16-4edd-8164-d867912c291b","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:28.011Z"}],"sources":[{"listingId":"f0211689-9a16-4edd-8164-d867912c291b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:28.011Z","lastSeenAt":"2026-04-28T02:33:34.170Z"}],"details":{"listingId":"f0211689-9a16-4edd-8164-d867912c291b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/20 \\\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":"The x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/20"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/ach/20"}],"useCases":["Programmatic ACH-related data or payment operations via a single POST call","Agent-driven workflows needing low-cost, keyless API access on Base","Integrating pay-per-request financial endpoints without subscription overhead"],"bestFor":["Developers wanting zero-setup, pay-as-you-go API access","AI agents with USDC on Base that need on-demand API calls","Prototyping workflows that require low-friction, no-auth endpoints"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume production use cases where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.039Z"},"updatedAt":"2026-04-28T02:33:34.170Z"}}