{"id":"3959355e-da70-4ed0-8a80-e8a284325904","shortId":"AK7qVn","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/73` 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 pricing is uniform at $0.02 per request with no API keys, rate limits, or minimum commitments required.\n\nThe specific endpoint `/api/v1/ach/73` is listed under the title \"Premium API Access\" but its exact functionality is unclear from the available documentation. The path suggests it may relate to ACH (Automated Clearing House) payment processing or data, but no schema, parameter documentation, or example responses are provided. The endpoint is live and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02. It accepts POST requests and returns `application/json`.\n\nThe broader lowpaymentfee.com platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation pages beyond the landing page are gated behind a wallet connection and provide no additional technical detail.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment processing API","lowpaymentfee","x402 API","micropayment API","Base USDC API","pay-per-call API"],"warnings":["Exact functionality of /api/v1/ach/73 is unknown — no documentation, schema, or examples available","All documentation pages (docs, api, pricing, README) are gated behind wallet connection and contain no useful content","The endpoint title 'Premium API Access' is generic and does not describe what the endpoint does","This endpoint is not listed on the provider's landing page among their advertised APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/73","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation on what /api/v1/ach/73 actually does, no input/output schema, no examples, and all doc pages are gated behind wallet connection. The endpoint's purpose must be guessed from its URL path 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'/request':12,30 '0.02':11,29,86,170,213 '000':161 '20':160 '6':166 'ACH API' 'Base USDC API' 'accept':172 'access':110 'ach':5,23,128 'addit':231 'advertis':182 'ai/ml':60 'analysi':191 'analyt':59 'api':16,34,56,91,109 'application/json':177 'autom':129 'avail':119 'base':8,26,79,162 'base-network' 'behind':224 'beyond':218 'broader':179 'call':4,22 'categori':183 'challeng':155 'classif':194 'clear':130 'collect':50 'commit':97 'connect':227 'convers':206 'crypto':63 'data':58,135,187 'decim':167 'detail':233 'document':120,140,216 'embed':195 'endpoint':6,24,38,68,101,147 'equal':169 'estim':203 'exact':113 'exampl':142 'exchang':198 'export':188 'feed':197 'financ':62 'function':114 'gas':202 'gate':223 'generat':208 'geocod':204 'hous':131 'includ':184 'infer':61 'insight':189 'json-response' 'key':17,35,92 'land':220 'limit':94 'list':104 'live':149 'lowpaymentfee' 'lowpaymentfee.com':45,180 'maxamountrequir':158 'may':125 'metric':185 'micropayment API' 'minimum':96 'network':80 'no-api-key' 'offer':48 'page':217,221 'paramet':139 'part':42 'path':122 'pay':2,20,53 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':52 'payment':72,132 'payment processing API' 'per':3,21,54,87 'platform':46,181 'point':215 'post':173 'post-endpoint' 'premium':108 'price':82,196,214 'process':133 'protocol':73 'provid':145,229 'quot':201 'rate':93,199 'relat':126 'report':186 'request':55,88,174 'requir':18,36,98 'respons':143 'return':151,176 'schema':138 'sentiment':190 'servic':66 'settl':74 'span':57 'specif':100 'suggest':123 'summar':193 'technic':232 'text':192 'titl':107 'token':200 'unclear':116 'uniform':84 'unit':163 'usdc':14,32,76,165 'usdc-settlement' 'use':69 'util':65 'valid':153,205 'via':9,27 'wallet':226 'x402':10,28,71,154 'x402 API' 'x402-payment'","prices":[{"id":"b3e90986-41fc-4b52-8b8d-6202613d9ef0","listingId":"3959355e-da70-4ed0-8a80-e8a284325904","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:18.033Z"}],"sources":[{"listingId":"3959355e-da70-4ed0-8a80-e8a284325904","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:18.033Z","lastSeenAt":"2026-04-27T11:03:51.629Z"}],"details":{"listingId":"3959355e-da70-4ed0-8a80-e8a284325904","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/73 \\\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":"Uniform pricing of $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/73"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/73"},{"claim":"Platform offers APIs across data analytics, AI/ML, finance, crypto, and utility categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing ACH-related data or payment functionality on a per-call basis","Integrating pay-per-request APIs without managing API keys or subscriptions","Agent-driven workflows that need on-demand financial data endpoints"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with x402-compatible payment capabilities on Base","Projects needing low-cost per-request financial or utility endpoints"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where per-request pricing may add up versus flat-rate plans","Anyone unable to settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:30.713Z"},"updatedAt":"2026-04-27T11:03:51.629Z"}}