{"id":"455b4db1-ddec-42c3-8378-dd686612cb00","shortId":"g5azUD","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":"This endpoint at `/api/v1/ach/83` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific function of the `/api/v1/ach/83` path is not documented — the listing title is simply \"Premium API Access\" and the endpoint sits under an `/ach/` path prefix that doesn't appear in the site's published API catalog. It may relate to ACH (Automated Clearing House) payment processing or bank transfer functionality, but this is speculative.\n\nPricing is $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02). Payment is made via the x402 exact-payment scheme: callers attach an `X-PAYMENT` header with a signed USDC payment on Base to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. No API keys, rate limits, or upfront commitments are required. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader lowpaymentfee.com platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more — all at the same $0.02/request price point. Documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so request/response schemas for this or any other endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","ach","json-api","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["ACH API","bank transfer API","payment processing","lowpaymentfee","x402 ACH","USDC pay-per-call","Base network API"],"warnings":["The /api/v1/ach/83 path is not listed in the provider's published API catalog — its actual functionality is unknown.","All documentation pages (/docs, /api, /pricing, /README) are empty, showing only 'Connect wallet'.","No request or response schema is available; callers cannot know what to send or what to expect back.","The 'Premium API Access' title is generic and does not describe what this endpoint does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/83","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/83","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 the specific functionality of /api/v1/ach/83 is undocumented. No request/response schema, no examples, and all documentation pages are empty. The endpoint path doesn't appear in the site's own API 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'/api/v1/ach/83':40,86 '/request':12,30,222 '0.02':11,29,139,151,221 '000':143 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':177 '20':142 '6':149 'ACH API' 'Base network API' 'USDC pay-per-call' 'accept':190 'access':98 'ach':5,23,123 'addit':201 'advertis':200 'ai/ml':60 'analysi':205 'analyt':59 'api':16,34,56,97,117,179 'appear':111 'application/json':195 'attach':163 'autom':124 'bank':130 'bank transfer API' 'base':8,26,79,144,175 'beyond':226 'broader':197 'call':4,22 'caller':162 'catalog':118 'classif':208 'clear':125 'collect':50 'commit':185 'connect':239 'crypto':63 'data':58 'decim':150 'document':90,225 'doesn':109 'embed':209 'empti':232 'endpoint':6,24,38,68,101,189,202,249 'essenti':231 'exact':159 'exact-pay':158 'exchang':212 'feed':211 'financ':62 'function':83,132 'geocod':214 'header':168 'hous':126 'infer':61 'json-api' 'key':17,35,180 'land':228 'limit':182 'list':92 'lowpaymentfee' 'lowpaymentfee.com':45,198 'made':154 'may':120 'network':80 'no-api-key' 'offer':48 'page':229,236 'part':42 'path':87,106 'pay':2,20,53 'pay-per-cal':1,19 'pay-per-request':52 'payment':72,127,152,160,167,173 'payment processing' 'per':3,21,54,140 'platform':46,199 'point':224 'post':191 'prefix':107 'premium':96 'price':137,210,223 'process':128 'protocol':73 'publish':116 'rate':181,213 'relat':121 'request':55,141,192 'request/response':242 'requir':18,36,187 'return':194 'schema':243 'scheme':161 'sentiment':204 'servic':66 'settl':74 'show':238 'sign':171 'simpli':95 'sit':102 'site':114 'span':57 'specif':82 'specul':136 'sub':235 'sub-pag':234 'summar':207 'text':206 'titl':93 'transfer':131 'unit':145 'unknown':251 'upfront':184 'usdc':14,32,76,147,172 'usdc-base' 'use':69 'util':65 'via':9,27,155 'wallet':240 'x':166 'x-payment':165 'x402':10,28,71,157 'x402 ACH' 'x402-payment'","prices":[{"id":"2df8aaff-fb90-4198-ad3b-2016a9ac9a5d","listingId":"455b4db1-ddec-42c3-8378-dd686612cb00","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/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:25.248Z"}],"sources":[{"listingId":"455b4db1-ddec-42c3-8378-dd686612cb00","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:25.248Z","lastSeenAt":"2026-04-27T09:33:29.968Z"}],"details":{"listingId":"455b4db1-ddec-42c3-8378-dd686612cb00","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/83 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Pricing is $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 of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/ach/83"},{"claim":"The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic ACH or payment-related operations via a single micropayment per call","Agent-driven financial workflows that need keyless, pay-as-you-go API access","Integrating low-cost payment infrastructure into automated pipelines"],"bestFor":["Developers wanting zero-signup, pay-per-call API access settled in USDC on Base","AI agents that can autonomously pay for API calls via x402","Prototyping workflows that need cheap, commitment-free API endpoints"],"notFor":["Production use cases requiring well-documented request/response schemas","Users who need fiat-only payment rails with no crypto involvement","High-volume batch processing where per-call pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:30.335Z"},"updatedAt":"2026-04-27T09:33:29.968Z"}}