{"id":"2387357b-cf9c-44c2-9ccd-8d1f97b68574","shortId":"C6Y7cS","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/24` is listed under \"Premium API Access\" and accepts POST requests. Payment is made per-call by attaching an X-PAYMENT header; no API keys, accounts, or rate limits are advertised.\n\nThe x402 challenge confirms the endpoint is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site-wide pricing of $0.02/request. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader lowpaymentfee.com platform advertises endpoints across several categories — data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available for this or any other endpoint. The exact functionality of the `/api/v1/ach/24` path — what \"ACH\" refers to or what the `24` parameter means — is not documented anywhere in the crawled material.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","no-api-key","post-endpoint"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","low fee API","x402 endpoint","USDC pay-per-call","Base network API","micropayment API"],"warnings":["No documentation exists for this endpoint — docs, API, pricing, and README pages all show only 'Connect wallet'","The meaning of 'ach/24' in the path is undocumented; it is unclear what this endpoint returns or expects","No OpenAPI spec or output schema is provided","No request body or response body examples are available anywhere in the crawled material","The platform lists many endpoint categories but none have visible documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/24","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually does, no request/response schemas, no examples, and the docs pages are empty. The purpose of '/api/v1/ach/24' is entirely 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'/request':12,30,137 '0.02':11,29,125,136 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '0x8335':113 '20':107 '24':236 '2913':114 '300':147 '6':120 'ACH API' 'Base network API' 'USDC pay-per-call' 'accept':71 'access':69 'account':90 'ach':5,23,230 'across':156 'address':143 'advertis':95,154 'ai/ml':160 'anywher':242 'api':16,34,46,68,88,185 'attach':81 'avail':215 'base':8,26,55,109,116 'base-network' 'broader':151 'call':4,22,79 'categori':158 'challeng':98 'classif':163 'collect':40 'confirm':99 'connect':194 'consist':128 'convers':177 'crawl':245 'data/analytics':159 'decim':121 'detail':201 'doc':184 'document':179,210,241 'embed':164 'endpoint':6,24,47,61,101,155,221 'estim':171 'exact':223 'exampl':213 'exchang':168 'extrem':181 'feed':167 'finance/web3':165 'function':224 'gas':170 'geocod':175 'header':86 'host':38 'howev':178 'infrastructur':173 'key':17,35,89 'limit':93 'list':65 'live':103 'low fee API' 'lowpaymentfee.com':37,152 'made':76 'materi':246 'mean':238 'micropayment API' 'network':56 'no-api-key' 'openapi':205 'page':189 'paramet':237 'path':228 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-request':42 'payload':214 'payment':74,85,139 'payment API' 'per':3,21,44,78,126 'per-cal':77 'per-request-billing' 'platform':153 'post':72 'post-endpoint' 'premium':67 'price':134,166,186 'prompt':196 'protocol':52 'rate':92,169 'readm':188 'refer':231 'render':191 'request':45,73,104,127 'request/response':208 'requir':18,36 'schema':209 'second':148 'sent':141 'sentiment':161 'settl':48 'sever':157 'sinc':117 'site':132 'site-wid':131 'spars':182 'spec':206 'specif':60 'summar':162 'technic':200 'timeout':149 'translat':123 'unit':110 'usdc':14,32,58,112,118 'usdc-settlement' 'use':57,119 'util':174 'valid':176 'via':9,27,49 'wallet':195 'wide':133 'x':84 'x-payment':83 'x402':10,28,51,97 'x402 endpoint' 'x402-payment'","prices":[{"id":"fad87b14-5ab4-4569-b2b8-bd75f1d36759","listingId":"2387357b-cf9c-44c2-9ccd-8d1f97b68574","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:29.265Z"}],"sources":[{"listingId":"2387357b-cf9c-44c2-9ccd-8d1f97b68574","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/24","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:29.265Z","lastSeenAt":"2026-04-27T22:32:47.007Z"}],"details":{"listingId":"2387357b-cf9c-44c2-9ccd-8d1f97b68574","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/24 \\\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 maxAmountRequired of 20000 base units of USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/ach/24"},{"claim":"Site-wide pricing is listed as $0.02/request with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/24"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to an ACH-related service with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Integrating x402-compatible endpoints into automated pipelines without subscription overhead"],"bestFor":["Developers or agents already using x402-compatible wallets on Base","Use cases requiring no-signup, no-rate-limit API access","Micropayment-settled one-shot API calls"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume use cases where per-call pricing may add up without volume discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.97Z"},"updatedAt":"2026-04-27T22:32:47.007Z"}}