{"id":"6706f6da-3d73-4cc7-9361-a1f5c4b5ee49","shortId":"a76WUA","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/8` 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, requiring a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The broader site offers 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 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. The exact functionality of the `/api/v1/ach/8` endpoint is unclear from available materials; the name suggests ACH (Automated Clearing House) banking-related functionality, but no schema, request/response examples, or detailed descriptions are provided. Users should test the endpoint to confirm its behavior before relying on it in production.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint","ach"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment processing API","x402 endpoint","USDC micropayment API","lowpaymentfee","Base network API","pay-per-call API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","The exact functionality of /api/v1/ach/8 is unknown; 'Premium API Access' is the only description provided","No request or response schema is available; endpoint behavior must be discovered by trial","If this endpoint relates to ACH banking operations, it may fall under financial regulation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/8","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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no request/response schema, and no explanation of what the /api/v1/ach/8 endpoint actually does. The docs pages are all blank wallet-connect prompts. This is effectively a stub 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'/api/v1/ach/8':63,196 '/docs':174 '/pricing':176 '/readme':178 '/request':12,30 '0.02':11,29,115,166 '000':104 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':128 '0x8335':109 '20':103 '2913':110 '300':131 '6':120 'ACH API' 'Base network API' 'USDC micropayment API' 'accept':71 'access':69 'ach':5,23,206 'across':139 'address':127 'ai/ml':141 'api':16,34,46,68,82 'autom':207 'avail':201 'bank':211 'banking-rel':210 'base':8,26,55,105,112 'base-network' 'behavior':232 'broader':135 'call':4,22,79 'challeng':93 'classif':144 'clear':208 'collect':40 'commit':90 'confirm':94,230 'connect':184 'content':190 'convers':160 'data/analytics':140 'decim':121 'descript':221 'detail':220 'document':169 'embed':145 'endpoint':6,24,47,61,96,138,197,228 'equal':114 'estim':154 'exact':192 'exampl':218 'exchang':149 'extrem':171 'feed':148 'finance/web3':146 'function':193,213 'gas':153 'generat':161 'geocod':158 'host':38 'hous':209 'infrastructur':156 'key':17,35,83 'limit':86 'list':65 'live':98 'lowpaymentfee' 'lowpaymentfee.com':37 'made':76 'materi':202 'maximum':101 'name':204 'network':56 'no-api-key' 'offer':137 'page':179 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':74,123 'payment processing API' 'per':3,21,44,78,116 'per-cal':77 'point':168 'post':72 'post-endpoint' 'premium':67 'price':147,167 'product':238 'prompt':186 'protocol':52 'provid':223 'quot':152 'rate':85,150 'relat':212 'reli':234 'render':181 'request':45,73,117 'request/response':217 'requir':18,36,99 'schema':216 'second':132 'sent':125 'sentiment':142 'settl':48 'site':136 'spars':172 'specif':60 'suggest':205 'summar':143 'test':226 'timeout':133 'token':151 'unclear':199 'unit':106 'upfront':89 'usdc':14,32,58,108,118 'usdc-settlement' 'use':57,119 'user':224 'util':157 'valid':159 'via':9,27,49 'wallet':185 'x402':10,28,51,92 'x402 endpoint' 'x402-payment'","prices":[{"id":"3a56bccd-3cae-4060-8d61-7d512106b58b","listingId":"6706f6da-3d73-4cc7-9361-a1f5c4b5ee49","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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:22.249Z"}],"sources":[{"listingId":"6706f6da-3d73-4cc7-9361-a1f5c4b5ee49","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/8","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:22.249Z","lastSeenAt":"2026-04-27T11:03:51.739Z"}],"details":{"listingId":"6706f6da-3d73-4cc7-9361-a1f5c4b5ee49","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/8 \\\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 network","source_url":"https://lowpaymentfee.com/api/v1/ach/8"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/8"}],"useCases":["Programmatic ACH-related lookups or operations paid per request","Agent-driven financial workflows requiring no pre-registration","Integrating low-cost API calls settled on-chain via USDC on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Prototyping workflows that need cheap per-call pricing without rate limits"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integration","High-volume production workloads where endpoint behavior is unverified","Anyone requiring fiat-only payment rails with no crypto involvement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:30.579Z"},"updatedAt":"2026-04-27T11:03:51.739Z"}}