{"id":"cb4d4bfa-9788-4646-b3e6-43d6ef65d306","shortId":"GPvrkL","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 payment protocol on the Base network. The specific endpoint at `/api/v1/ach/42` 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 call (USDC uses 6 decimals). No API keys, subscriptions, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints across several 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 are priced at $0.02 per request. However, the specific endpoint `/api/v1/ach/42` does not clearly map to any of these documented categories — the \"ach\" path segment and the numeric ID \"42\" are not explained in the available documentation.\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 spec, no request/response schema, and no examples of what this endpoint accepts or returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality it provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","lowpaymentfee","x402 endpoint","USDC micropayment","Base network API","pay-per-call API"],"warnings":["The endpoint path /api/v1/ach/42 does not correspond to any documented API on the landing page — its purpose is unknown.","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no usable content.","No request body schema or response schema is available; callers cannot know what to send or what to expect back.","The 'ach' path segment may relate to ACH bank transfers, which could involve regulated financial activity — exercise caution."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/42","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/42","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 402 challenge, but documentation is effectively nonexistent — no OpenAPI spec, no request/response schema, no examples, and the /docs pages are empty. The purpose of the /api/v1/ach/42 path is unexplained and does not match any documented endpoint category. This is essentially a stub 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'/api/v1/ach/42':62,177 '/docs':209 '/pricing':211 '/readme':213 '/request':12,30 '0.02':11,29,94,170 '000':89 '0x8335':79 '20':88 '2913':80 '402':252 '42':196 '6':99 'ACH API' 'Base network API' 'USDC micropayment' 'accept':70,241 'access':68 'ach':5,23,189 'across':130 'advertis':109,128 'ai':140 'analysi':144 'analyt':134 'api':16,34,46,67,102 'attach':112 'avail':202 'base':8,26,56,82,90 'base-network' 'broader':125 'call':4,22,96 'caller':110 'categori':132,187 'challeng':253 'classif':147 'clear':180 'collect':40 'confirm':247 'connect':219 'content':225 'contract':78 'convers':164 'cost':86 'data':133,137,261 'decim':100 'document':186,203,204,256 'embed':148 'endpoint':6,24,47,60,129,176,240,245 'equal':93 'estim':158 'exampl':236 'exchang':153 'explain':199 'export':138 'extrem':206 'feed':152 'financ':149 'function':263 'gas':157 'gate':48 'generat':165 'geocod':162 'header':117 'host':38 'howev':173 'id':195 'infrastructur':160 'insight':139 'key':17,35,103 'learn':142 'limit':107 'list':64 'live':248 'lowpaymentfee' 'lowpaymentfee.com':37,126 'machin':141 'map':181 'maximum':85 'metric':135 'network':57 'no-api-key' 'numer':194 'openapi':229 'page':214 'path':190 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':52,73,116,122 'payment API' 'per':3,21,44,95,171 'platform':127 'post':71 'post-endpoint' 'premium':66 'price':151,168 'prompt':221 'proof':123 'proper':251 'protocol':53 'provid':265 'quot':156 'rate':106,154 'render':216 'report':136 'request':45,72,172 'request/response':232 'requir':18,36 'return':243,249 'schema':233 'segment':191 'sentiment':143 'settl':75 'sever':131 'simpli':111 'spars':207 'spec':230 'specif':59,175 'subscript':104 'summar':146 'text':145 'token':155 'unclear':259 'unit':91 'usdc':14,32,77,97 'usdc-settlement' 'use':98 'util':161 'valid':120,163 'via':9,27 'wallet':220 'web3':150 'without':255 'x':115 'x-payment':114 'x402':10,28,51,121 'x402 endpoint' 'x402-payment'","prices":[{"id":"e89d7b92-c179-4e51-b35e-9e95f3ed7cee","listingId":"cb4d4bfa-9788-4646-b3e6-43d6ef65d306","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:34.100Z"}],"sources":[{"listingId":"cb4d4bfa-9788-4646-b3e6-43d6ef65d306","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:34.100Z","lastSeenAt":"2026-04-27T22:32:47.199Z"}],"details":{"listingId":"cb4d4bfa-9788-4646-b3e6-43d6ef65d306","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/42 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/42"},{"claim":"All listed APIs 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/42"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a premium ACH-related data or processing endpoint with per-call USDC micropayments","Integrating pay-per-use API calls into agent workflows without managing API keys","Settling API costs on-chain via the Base L2 network"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","Agent-based systems that can handle x402 payment challenges natively","Users comfortable with USDC payments on Base"],"notFor":["Anyone needing detailed API documentation or request/response schemas before integrating","Use cases requiring free or subscription-based access models","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.744Z"},"updatedAt":"2026-04-27T22:32:47.199Z"}}