{"id":"331b8c98-e181-468b-ab52-d25992e08b23","shortId":"TMYXeC","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 gated by the x402 protocol on the Base network. This specific endpoint (`/api/v1/ach/4`) is listed as \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of 20,000 base units, which equals $0.02 per call (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe broader lowpaymentfee.com 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.\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 exact functionality behind the `/api/v1/ach/4` path is unclear — the name \"Premium API Access\" and the `ach` path segment suggest it may relate to ACH (Automated Clearing House) payment processing, but this cannot be confirmed from the available material.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","post-endpoint"],"categories":["finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","ACH API","crypto-gated endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only a 'Connect wallet' prompt with no technical content.","No OpenAPI or schema definition found; request and response formats are unknown.","The purpose of /api/v1/ach/4 ('Premium API Access') is unclear — the 'ach' path suggests ACH payment processing but this is unconfirmed.","The platform lists many endpoint categories (AI, finance, analytics, infrastructure) but provides no evidence of actual underlying functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/4","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and its pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual functionality of /api/v1/ach/4 is undocumented. This is effectively a stub 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'/api/v1/ach/4':60,210 '/docs':173 '/pricing':175 '/readme':177 '/request':12,30 '0.02':11,29,92,165 '000':87 '0x8335':77 '20':86 '2913':78 '6':97 'ACH API' 'Base network API' 'USDC micropayment API' 'accept':68 'access':66,218 'ach':5,23,221,229 'across':125 'advertis':123 'ai':135 'analysi':139 'analyt':129 'api':16,34,46,65,100,217 'attach':111 'autom':230 'avail':204,242 'base':8,26,55,80,88 'base-network' 'behind':208 'broader':120 'call':4,22,94 'caller':109 'cannot':237 'categori':127 'classif':142 'clear':231 'collect':40 'commit':106 'confirm':239 'connect':183 'contract':76 'convers':159 'cost':84 'crypto-gated endpoint' 'data':128,132 'decim':98 'detail':190 'document':168,199 'embed':143 'endpoint':6,24,47,59,124 'equal':91 'estim':153 'exact':206 'exampl':202 'exchang':148 'export':133 'extrem':170 'feed':147 'financ':144 'function':207 'gas':152 'gate':48 'generat':160 'geocod':157 'header':115 'host':38 'hous':232 'infrastructur':155 'insight':134 'key':17,35,101 'learn':137 'limit':103 'list':62 'lowpaymentfee' 'lowpaymentfee.com':37,121 'machin':136 'materi':243 'maximum':83 'may':226 'metric':130 'name':215 'network':56 'no-api-key' 'openapi':194 'page':178 'path':211,222 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payload':203 'payment':71,114,233 'per':3,21,44,93,166 'platform':122 'post':69 'post-endpoint' 'premium':64,216 'price':146,163 'process':234 'prompt':185 'protocol':52 'quot':151 'rate':102,149 'relat':227 'render':180 'report':131 'request':45,70,118,167 'request/response':197 'requir':18,36,108 'schema':198 'segment':223 'sentiment':138 'settl':73 'sever':126 'simpli':110 'spars':171 'spec':195 'specif':58 'suggest':224 'summar':141 'technic':189 'text':140 'token':150 'unclear':213 'unit':89 'upfront':105 'usdc':14,32,75,95 'usdc-settlement' 'use':96 'util':156 'valid':158 'via':9,27 'wallet':184 'web3':145 'x402':10,28,51,113 'x402 API' 'x402-payment'","prices":[{"id":"f3734600-ba2f-439f-aa14-83e2c033ec5d","listingId":"331b8c98-e181-468b-ab52-d25992e08b23","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:33.498Z"}],"sources":[{"listingId":"331b8c98-e181-468b-ab52-d25992e08b23","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:33.498Z","lastSeenAt":"2026-04-27T22:32:47.175Z"}],"details":{"listingId":"331b8c98-e181-468b-ab52-d25992e08b23","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/4 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/4"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/4"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API endpoint without managing API keys or subscriptions","Agent-driven workflows that need on-demand, per-call payment settlement on Base","Exploring x402-gated services with minimal upfront commitment"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and agent frameworks on the Base network","Low-volume or sporadic usage where per-call pricing is cost-effective"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription models","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.799Z"},"updatedAt":"2026-04-27T22:32:47.175Z"}}