{"id":"b18f08b4-d7d5-4547-b3df-6879e9cb53e1","shortId":"dXgLpt","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/40` 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. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\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 utilities (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, the specific functionality behind the `/api/v1/ach/40` path is not documented — the name \"Premium API Access\" and the \"ach\" path segment suggest it may relate to ACH (Automated Clearing House) payment processing or information, but this is speculative.\n\nDocumentation is extremely thin. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what data or service this particular endpoint returns. The endpoint is confirmed live (returns a valid x402 402 challenge), but callers should be aware that the actual behavior behind the paywall is undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","low fee API","x402 endpoint","USDC micropayment API","Base network API","pay-per-call API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'","No OpenAPI or output schema describing request parameters or response format","The actual functionality behind '/api/v1/ach/40' is unknown; 'Premium API Access' is the only description","The 'ach' path segment may imply regulated financial services (ACH payments) — verify compliance before use"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/40","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is zero documentation on what the endpoint actually does, no request/response schema, and no examples. The docs pages are empty. The purpose of '/api/v1/ach/40' is unclear, making this effectively a stub 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'/api/v1/ach/40':63,172 '/docs':209 '/pricing':210 '/readme':213 '/request':12,30 '0.02':11,29,76,163 '000':80 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':95 '20':79 '402':255 '6':86 'ACH API' 'Base network API' 'USDC micropayment API' 'accept':71 'access':69,181 'ach':5,23,184,192 'across':123 'actual':264 'address':94 'advertis':121 'ai':133 'analysi':137 'analyt':127 'api':16,34,46,68,99,180 'attach':110 'autom':193 'awar':261 'base':8,26,55,81,97 'base-network' 'behavior':265 'behind':170,266 'broader':119 'call':4,22,78 'caller':108,258 'categori':125 'chain':93 'challeng':256 'classif':140 'clear':194 'collect':40 'commit':105 'confirm':249 'connect':219 'content':225 'convers':157 'data':126,130,239 'decim':87 'descript':236 'document':176,204 'embed':141 'endpoint':6,24,47,61,122,244,247 'estim':151 'exampl':233 'exchang':146 'export':131 'extrem':206 'feed':145 'financ':142 'function':169 'gas':150 'generat':158 'geocod':155 'header':114 'host':38 'hous':195 'howev':166 'inform':199 'infrastructur':153 'insight':132 'key':17,35,100 'learn':135 'limit':102 'list':65 'live':250 'low fee API' 'lowpaymentfee.com':37 'machin':134 'may':189 'metric':128 'name':178 'network':56 'no-api-key' 'on-chain':91 'openapi':229 'page':214 'particular':243 'path':173,185 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':74,113,196 'payment API' 'paywal':268 'per':3,21,44,77,164 'platform':120 'post':72 'post-endpoint' 'premium':67,179 'price':144,161 'process':197 'prompt':221 'protocol':52 'quot':149 'rate':101,147 'relat':190 'render':216 'report':129 'request':45,73,117,165 'request/response':232 'requir':18,36,107 'return':245,251 'schema':230 'segment':186 'sent':88 'sentiment':136 'servic':241 'settl':48 'sever':124 'simpli':109 'specif':60,168 'specul':203 'suggest':187 'summar':139 'text':138 'thin':207 'token':148 'undocu':270 'unit':82 'upfront':104 'usdc':14,32,58,84 'usdc-settlement' 'use':57 'util':154 'valid':156,253 'via':9,27,49 'wallet':220 'web3':143 'x402':10,28,51,112,254 'x402 endpoint' 'x402-payment'","prices":[{"id":"ac833f86-d00f-4f27-a4f5-bd9ead8377fc","listingId":"b18f08b4-d7d5-4547-b3df-6879e9cb53e1","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:34.063Z"}],"sources":[{"listingId":"b18f08b4-d7d5-4547-b3df-6879e9cb53e1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:34.063Z","lastSeenAt":"2026-04-27T22:32:47.175Z"}],"details":{"listingId":"b18f08b4-d7d5-4547-b3df-6879e9cb53e1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/40 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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/40"},{"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 contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/40"}],"useCases":["Programmatic access to an ACH-related service with per-call USDC micropayments","Agent-driven API consumption without pre-registration or API key management","Integrating pay-as-you-go endpoints into automated workflows on Base"],"bestFor":["Developers wanting keyless, pay-per-request API access settled on-chain","AI agents that can attach x402 payment headers autonomously","Users who prefer no subscription commitments and micro-transaction pricing"],"notFor":["Anyone needing documented request/response schemas before integrating","High-volume use cases where $0.02/request adds up significantly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.796Z"},"updatedAt":"2026-04-27T22:32:47.175Z"}}