{"id":"1acf6394-22e2-4d05-a953-0793d5ccf442","shortId":"KQeWgp","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 gated by the x402 protocol on the Base network. This specific endpoint (`/api/v1/ach/123`) is listed under \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract `0x8335…2913` on Base) at a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced uniformly at $0.02 per request.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/ach/123` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but the lack of documentation makes it difficult to determine the exact input parameters or output format.","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 micropayment","Base network API","pay-per-call API"],"warnings":["No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet'","No OpenAPI or input/output schema provided; request parameters and response format are unknown","The specific purpose of /api/v1/ach/123 is unclear — 'Premium API Access' is a generic label","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/123","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/123","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, documentation is essentially nonexistent — every doc/pricing/README page shows only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what '/api/v1/ach/123' actually does or accepts. The listing is effectively a 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'/request':12,30 '0.02':11,29,92,171 '000':87 '0x8335':77 '20':86 '2913':78 '402':222 '6':97 'ACH API' 'Base network API' 'USDC micropayment' 'accept':68 'access':66 'ach':5,23 'across':129 'actual':213 'advertis':127 'ai':139 'analysi':143 'analyt':133 'api':16,34,46,65,100,181 'attach':111 'base':8,26,55,80,88 'base-network' 'broader':124 'call':4,22 'caller':109 'categori':131 'challeng':223 'classif':146 'collect':40 'commit':106 'connect':189 'contract':76 'convers':163 'cost':84 'data':132,136 'decim':98 'descript':207 'detail':196 'determin':233 'difficult':231 'doc':179 'document':174,228 'embed':147 'endpoint':6,24,47,59,128,166,212,216 'equal':91 'estim':157 'exact':235 'exampl':204 'exchang':152 'export':137 'extrem':176 'feed':151 'financ':148 'format':240 'four':130 'gas':156 'gate':48 'generat':164 'geocod':161 'header':116 'host':38 'infrastructur':159 'input':236 'insight':138 'key':17,35,101 'lack':226 'learn':141 'limit':103 'list':62 'live':218 'low fee API' 'lowpaymentfee.com':37,125 'machin':140 'make':229 'maximum':83 'metric':134 'network':56 'no-api-key' 'openapi':200 'output':239 'page':184 'paramet':237 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':71,115,121 'payment API' 'per':3,21,44,93,172 'platform':126 'post':69 'post-endpoint' 'premium':64 'price':150,168,180 'prompt':191 'proof':122 'protocol':52 'quot':155 'rate':102,153 'readm':183 'render':186 'report':135 'request':45,70,94,173 'request/response':203 'requir':18,36,108 'return':214,219 'schema':201 'sentiment':142 'settl':73 'simpli':110 'spars':177 'specif':58 'summar':145 'technic':195 'text':144 'token':154 'uniform':169 'unit':89 'upfront':105 'usdc':14,32,75,95 'usdc-settlement' 'use':96 'util':160 'valid':119,162,221 'via':9,27 'wallet':190 'web3':149 'x':114 'x-payment':113 'x402':10,28,51,120 'x402 endpoint' 'x402-payment'","prices":[{"id":"cb5ae850-b38a-4ced-a929-07f0dbfa036a","listingId":"1acf6394-22e2-4d05-a953-0793d5ccf442","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/123","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":"1acf6394-22e2-4d05-a953-0793d5ccf442","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/123","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:53.046Z","lastSeenAt":"2026-04-27T15:05:15.555Z"}],"details":{"listingId":"1acf6394-22e2-4d05-a953-0793d5ccf442","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/123 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/123"},{"claim":"All endpoints 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/123"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic ACH-related data retrieval 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, pay-per-request API access","AI agents that can settle x402 payments on Base","Projects needing low-cost per-call pricing without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who prefer subscription-based pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.894Z"},"updatedAt":"2026-04-27T15:05:15.555Z"}}