{"id":"06bf819f-4660-4ebf-a07e-bba408397e21","shortId":"jyvshK","kind":"x402","title":"Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC","tagline":"Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. This specific endpoint (`/api/v1/ach/2`) is listed as \"Premium API Access\" and accepts POST requests. Payment is $0.02 per call (20,000 base units of USDC with 6 decimals), sent to the on-chain address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base.\n\nThe broader platform advertises endpoints across several categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nHowever, 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 schema, no request/response examples, and no description of what the `/api/v1/ach/2` endpoint actually returns. The endpoint is live (returns a valid 402 x402 challenge), but without documentation it is unclear what data or functionality it provides. The \"ACH\" path segment and \"Premium API Access\" label are the only hints, and they are ambiguous.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","post-endpoint"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","lowpaymentfee","x402 API","USDC micropayment API","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","No OpenAPI or input/output schema provided; request and response formats are unknown","The purpose of /api/v1/ach/2 ('Premium API Access') is ambiguous — 'ACH' could refer to Automated Clearing House payments or something else entirely","No examples of successful responses exist in the crawl material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/2","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on what the endpoint does, what inputs it expects, or what it returns. No OpenAPI schema, no examples, and the docs pages are empty. The listing is effectively a 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'/request':12,26 '0.02':11,25,67,134 '000':71 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':86 '20':70 '402':197 '6':77 'ACH API' 'Base network API' 'USDC micropayment API' 'accept':62 'access':60,219 'ach':5,19,213 'across':94 'actual':188 'address':85 'advertis':92 'ai':104 'ambigu':228 'analysi':108 'analyt':98 'api':38,59,139,155,218 'base':8,22,47,72,88 'base-network' 'broader':90 'call':4,18,69 'categori':96 'chain':84 'challeng':199 'classif':111 'collect':32 'commit':147 'connect':164 'convers':127 'data':97,101,207 'decim':78 'descript':182 'detail':171 'doc':154 'document':149,202 'embed':112 'endpoint':6,20,39,53,93,130,187,191 'estim':122 'exampl':179 'exchang':117 'export':102 'extrem':151 'feed':116 'financ':113 'function':209 'gas':121 'generat':128 'geocod':125 'hint':224 'host':30 'howev':148 'infrastructur':124 'insight':103 'key':140 'label':220 'learn':106 'limit':143 'list':56 'live':193 'lowpaymentfee' 'lowpaymentfee.com':29 'machin':105 'metric':99 'minimum':146 'network':48 'on-chain':82 'openapi':175 'page':159 'path':214 'pay':2,16,35 'pay-per-cal':1,15 'pay-per-call API' 'pay-per-request':34 'payment':65 'payment API' 'per':3,17,36,68,135 'platform':91 'post':63 'post-endpoint' 'premium':58,217 'price':115,132,156 'prompt':166 'protocol':44 'provid':211 'quot':120 'rate':118,142 'readm':158 'render':161 'report':100 'request':37,64,136 'request/response':178 'return':189,194 'schema':176 'segment':215 'sent':79 'sentiment':107 'settl':40 'sever':95 'spars':152 'specif':52 'summar':110 'technic':170 'text':109 'token':119 'unclear':205 'unit':73 'usdc':14,28,50,75 'usdc-settlement' 'use':49 'valid':126,196 'via':9,23,41 'wallet':165 'web3':114 'without':201 'x402':10,24,43,198 'x402 API' 'x402-payment'","prices":[{"id":"ae3f055b-ea7f-43ed-bd9e-158acd0bad70","listingId":"06bf819f-4660-4ebf-a07e-bba408397e21","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:28.625Z"}],"sources":[{"listingId":"06bf819f-4660-4ebf-a07e-bba408397e21","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:28.625Z","lastSeenAt":"2026-04-28T02:33:34.143Z"}],"details":{"listingId":"06bf819f-4660-4ebf-a07e-bba408397e21","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/2 \\\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":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/2"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/2"}],"useCases":["Programmatic access to an ACH-related service with per-request USDC micropayments","Agent-driven API consumption without API keys or subscriptions","Exploring x402 protocol payment flows on Base"],"bestFor":["Developers experimenting with x402 pay-per-call patterns","Agents that need keyless, on-demand API access settled in USDC on Base","Users who want zero-commitment, no-subscription API access"],"notFor":["Anyone needing well-documented, production-grade APIs with clear schemas","Use cases requiring free or fiat-only payment methods","High-volume consumers who need bulk pricing or rate guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.041Z"},"updatedAt":"2026-04-28T02:33:34.143Z"}}