{"id":"c08d2b8e-0311-4229-98aa-596d7e507e5c","shortId":"SRxMs2","kind":"x402","title":"Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys required.","tagline":"Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys required.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 protocol on the Base network. This specific endpoint (`/api/v1/ach/100`) is listed under the title \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913) on Base, with a maximum amount of 20,000 base units — which at 6 decimals equals $0.02 per request.\n\nThe broader platform advertises categories including 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 utilities (geocoding, validation, conversion, generation). All endpoints are priced uniformly at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nDocumentation 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 spec, no request/response schema documentation, and no example payloads available. The specific functionality of the `/api/v1/ach/100` endpoint is unclear from the available material; the path suggests ACH (Automated Clearing House) payment processing, but this is not confirmed by any documentation. The endpoint is live and returning a valid x402 402 challenge.","tags":[],"capabilities":["x402-payment-gated","pay-per-request","usdc-settlement","base-network","no-api-key","post-endpoint"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment processing API","x402 API","USDC micropayment","Base network API","lowpaymentfee","pay-per-call API","crypto-gated endpoint"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet' with no content","The specific functionality of /api/v1/ach/100 is undocumented and unclear","No request or response schema is provided","No OpenAPI or machine-readable spec exists","The endpoint name suggests ACH payment processing which may involve regulated financial activity"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/100","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/100","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 challenge, but there is zero documentation on what the endpoint actually does, what request body it expects, or what it returns. No OpenAPI spec, no examples, and the docs pages are empty. The purpose of '/api/v1/ach/100' is 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'/api/v1/ach/100':60,201 '/call':12,30 '/docs':164 '/pricing':166 '/readme':168 '0.02':11,29,97,145 '000':89 '0x8335':79 '20':88 '2913':80 '402':235 '6':94 'ACH API' 'Base network API' 'USDC micropayment' 'accept':70 'access':68 'ach':5,23,212 'advertis':103 'ai':113 'amount':86 'analysi':117 'analyt':107 'api':16,34,46,67,150 'autom':213 'avail':195,207 'base':8,26,55,82,90 'base-network' 'broader':101 'categori':104 'challeng':236 'classif':120 'clear':214 'collect':40 'commit':158 'confirm':222 'connect':174 'contract':78 'convers':137 'crypto-gated endpoint' 'data':106,110 'decim':95 'detail':181 'document':159,190,225 'embed':121 'endpoint':6,24,47,59,140,202,227 'equal':96 'estim':131 'exampl':193 'exchang':126 'export':111 'extrem':161 'feed':125 'financ':122 'function':198 'gas':130 'gate':48 'generat':138 'geocod':135 'host':38 'hous':215 'includ':105 'infrastructur':133 'insight':112 'key':17,35,151 'learn':115 'limit':154 'list':62 'live':229 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':114 'materi':208 'maximum':85 'metric':108 'minimum':157 'network':56 'no-api-key' 'openapi':185 'page':169 'path':210 'pay':2,20,43 'pay-per-call API' 'pay-per-request':1,19,42 'payload':194 'payment':73,216 'payment processing API' 'per':3,21,44,98,146 'platform':102 'post':71 'post-endpoint' 'premium':66 'price':124,142 'process':217 'prompt':176 'protocol':52 'quot':129 'rate':127,153 'render':171 'report':109 'request':4,22,45,72,99,147 'request/response':188 'requir':18,36 'return':231 'schema':189 'sentiment':116 'settl':75 'spars':162 'spec':186 'specif':58,197 'suggest':211 'summar':119 'technic':180 'text':118 'titl':65 'token':128 'unclear':204 'uniform':143 'unit':91 'usdc':14,32,77 'usdc-settlement' 'util':134 'valid':136,233 'via':9,27 'wallet':175 'web3':123 'x402':10,28,51,234 'x402 API' 'x402-payment-gated'","prices":[{"id":"16a1b275-822e-4550-b65e-1909a8b01156","listingId":"c08d2b8e-0311-4229-98aa-596d7e507e5c","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/100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:26.138Z"}],"sources":[{"listingId":"c08d2b8e-0311-4229-98aa-596d7e507e5c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/100","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:26.138Z","lastSeenAt":"2026-04-28T02:33:34.027Z"}],"details":{"listingId":"c08d2b8e-0311-4229-98aa-596d7e507e5c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/100 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/100"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/100"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic ACH-related operations paid per request in USDC","Agent-initiated financial API calls without pre-registration or API keys","Integrating pay-as-you-go infrastructure endpoints into automated workflows"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.151Z"},"updatedAt":"2026-04-28T02:33:34.027Z"}}