{"id":"764a9bcf-a893-488c-86b8-4aff912e9ce0","shortId":"HsTqn2","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/11` 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.\n\nThe x402 challenge confirms the endpoint is live, accepting USDC (contract `0x8335…2913` on Base) with a `maxAmountRequired` of 20,000 base units. 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 scheme is \"exact\" with a 300-second timeout.\n\nThe broader lowpaymentfee.com platform advertises endpoints spanning 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/11` is not documented beyond the generic \"Premium API Access\" label. No OpenAPI schema, request/response examples, or detailed documentation were found — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further 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/11 is entirely undocumented — 'Premium API Access' provides no indication of what the endpoint actually does.","No OpenAPI spec, request schema, or response schema is available.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.","The 'ach' path segment suggests ACH (Automated Clearing House) banking functionality, but this is unconfirmed and could be misleading."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/11","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/11","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 pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of /api/v1/ach/11 is completely undocumented. The endpoint name 'Premium API Access' is generic and 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'/request':12,30,135 '0.02':11,29,122,134 '000':111 '0x8335':102 '20':110 '2913':103 '300':146 '6':117 'ACH API' 'Base network API' 'USDC API' 'accept':71,99 'access':69,195 'ach':5,23 'across':136 'advertis':130,153 'ai/ml':158 'analysi':160 'analyt':157 'api':16,34,46,68,82,194,211 'base':8,26,55,105,112 'base-network' 'behind':185 'beyond':190 'broader':150 'call':4,22,79 'challeng':93 'classif':162 'collect':40 'commit':90 'confirm':94 'connect':217 'consist':125 'content':223 'contract':101 'convers':179 'data':156 'decim':118 'detail':203 'doc':208 'document':189,204 'embed':163 'endpoint':6,24,47,61,96,138,154 'estim':173 'exact':143 'exampl':201 'exchang':168 'feed':167 'financ':164 'flat':131 'found':206 'function':184 'gas':172 'generat':180 'generic':192 'geocod':177 'host':38 'howev':181 'infrastructur':175 'key':17,35,83 'label':196 'limit':86 'list':65 'live':98 'low fee API' 'lowpaymentfee.com':37,151 'made':76 'maxamountrequir':108 'micropayment API' 'network':56 'no-api-key' 'openapi':198 'page':212 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':74,140 'payment API' 'per':3,21,44,78,123 'per-cal':77 'platform':152 'post':72 'post-endpoint' 'premium':67,193 'price':132,166,209 'prompt':219 'protocol':52 'quot':171 'rate':85,169 'render':214 'request':45,73,124 'request/response':200 'requir':18,36 'schema':199 'scheme':141 'second':147 'sentiment':159 'settl':48 'sinc':114 'site':128 'span':155 'specif':60,183 'summar':161 'timeout':148 'token':170 'translat':120 'unit':113 'upfront':89 'usdc':14,32,58,100,115 'usdc-settlement' 'use':57,116 'util':176 'valid':178 'via':9,27,49 'wallet':218 'web3':165 'x402':10,28,51,92 'x402 endpoint' 'x402-payment'","prices":[{"id":"222d4bdc-2339-481d-bec1-9ec35e763356","listingId":"764a9bcf-a893-488c-86b8-4aff912e9ce0","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:26.157Z"}],"sources":[{"listingId":"764a9bcf-a893-488c-86b8-4aff912e9ce0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:26.157Z","lastSeenAt":"2026-04-28T02:33:34.052Z"}],"details":{"listingId":"764a9bcf-a893-488c-86b8-4aff912e9ce0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/11 \\\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, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base with exact scheme and 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/ach/11"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/11"}],"useCases":["Programmatic access to ACH-related data or operations at $0.02 per call","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Integrating low-cost per-request endpoints without subscription overhead"],"bestFor":["Developers wanting zero-setup, pay-per-use API access","AI agents that can settle x402 payments in USDC on Base","Projects needing low-cost API calls without rate limits or API key management"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring non-crypto payment methods","High-volume batch processing where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.15Z"},"updatedAt":"2026-04-28T02:33:34.052Z"}}