{"id":"1de29b2c-c122-4092-bd45-e6dccf3e3290","shortId":"2Y4sGp","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/113` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint is listed under \"Premium API Access\" but its exact functionality is unclear — the path suggests ACH (Automated Clearing House) banking data or operations, though no documentation describes the input/output schema. The platform advertises a uniform $0.02 per request pricing model across all endpoints.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and requiring payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is made via the x402 `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a 300-second timeout. No API keys or accounts are needed — access is granted purely through the x402 payment header.\n\nThe broader platform lists endpoints across data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/crypto (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). However, documentation pages (`/docs`, `/pricing`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response formats for this or any endpoint remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","ach-data"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment processing API","bank transfer API","lowpaymentfee","x402 API","micropayment API","USDC pay-per-call"],"warnings":["No documentation available — /docs, /pricing, and /README pages all return only a 'Connect wallet' prompt with no content","The exact purpose and input/output schema of /api/v1/ach/113 are unknown; 'Premium API Access' is a generic label","The 'ach' path segment suggests financial/banking operations which may be subject to regulatory requirements","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/113","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/113","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 zero documentation on what this endpoint actually does, what inputs it accepts, or what it returns. All doc pages show only 'Connect wallet' with no content. The 'Premium API Access' label and '/ach/113' path are the only clues to 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'/docs':205 '/pricing':206 '/readme':207 '/request':12,30 '0.02':11,29,107,142 '000':131 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':155 '0x8335':136 '20':130 '2913':137 '300':158 '6':140 'ACH API' 'USDC pay-per-call' 'accept':123 'access':77,168 'account':165 'ach':5,23,87 'ach-data' 'across':112,182 'actual':221 'address':154 'advertis':104 'ai/ml':184 'api':16,34,57,76,162 'autom':88 'bank':91 'bank transfer API' 'base':8,26,65,132,139 'base-network' 'broad':50 'broader':178 'call':4,22,144 'catalog':51 'challeng':117 'classif':187 'clear':89 'confirm':118 'connect':212 'content':218 'convers':201 'data':92 'data/analytics':183 'decim':141 'describ':98 'document':97,203 'embed':188 'endpoint':6,24,38,71,114,120,181,228 'estim':195 'exact':80,151 'exchang':192 'feed':191 'finance/crypto':189 'format':223 'function':81 'gas':194 'geocod':199 'grant':170 'header':176 'hous':90 'howev':202 'infrastructur':197 'input/output':100 'key':17,35,163 'list':73,180 'live':122 'lowpaymentfee' 'lowpaymentfee.com':45 'made':147 'micropayment API' 'model':111 'need':167 'network':66 'no-api-key' 'offer':48 'oper':94 'page':204 'part':42 'path':85 'pay':2,20,54 'pay-per-cal':1,19 'pay-per-request':53 'payment':128,145,175 'payment processing API' 'per':3,21,55,108,143 'platform':46,103,179 'post':124 'premium':75 'price':110,190 'prompt':214 'protocol':62 'pure':171 'rate':193 'remain':229 'request':56,109,125 'request/response':222 'requir':18,36,127 'return':209 'schema':101 'scheme':152 'second':159 'sentiment':185 'settl':58 'specif':70 'substant':217 'suggest':86 'summar':186 'though':95 'timeout':160 'unclear':83 'undocu':230 'uniform':106 'unit':133 'usdc':14,32,68,135 'usdc-settlement' 'use':67 'util':198 'valid':200 'via':9,27,59,148 'wallet':213 'x402':10,28,61,116,150,174 'x402 API' 'x402-payment'","prices":[{"id":"1a5430c6-a9d6-498c-bdf8-fe8e3783220f","listingId":"1de29b2c-c122-4092-bd45-e6dccf3e3290","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/113","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:51.259Z"}],"sources":[{"listingId":"1de29b2c-c122-4092-bd45-e6dccf3e3290","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/113","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:51.259Z","lastSeenAt":"2026-04-27T16:34:09.268Z"}],"details":{"listingId":"1de29b2c-c122-4092-bd45-e6dccf3e3290","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/113 \\\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":"Platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms live endpoint requiring 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/113"},{"claim":"Documentation pages (/docs, /pricing, /README) contain no substantive content beyond 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing ACH-related banking data or operations on a per-call basis","Agent-driven financial workflows requiring no pre-registration","Programmatic access to premium endpoints with crypto micropayments"],"bestFor":["Developers or agents wanting zero-signup API access via x402","Use cases requiring per-call payment without subscriptions","Base network USDC holders needing on-demand API calls"],"notFor":["Users who need detailed API documentation before integrating","High-volume use cases where per-call pricing is inefficient","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.988Z"},"updatedAt":"2026-04-27T16:34:09.268Z"}}