{"id":"6a5e440d-e81c-4c68-8f1e-24236011a547","shortId":"gzG5vh","kind":"x402","title":"Pay-per-request ACH endpoint on Base network via x402, $0.02/call in USDC.","tagline":"Pay-per-request ACH endpoint on Base network via x402, $0.02/call in USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path /api/v1/ach/163. It is part of a broader platform offering multiple pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities—all settled via x402 micropayments on the Base network using USDC.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled on-chain to a specified address using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base). The maxAmountRequired is 20000 base units, which at 6 decimals equals $0.02 per request. No API keys or rate limits are advertised; access is granted immediately upon valid x402 payment.\n\nThe specific functionality of the /api/v1/ach/163 endpoint is not documented beyond the label \"Premium API Access.\" The platform's landing page lists various API categories but does not include this particular path in its public catalog. Documentation pages (docs, pricing, README) all resolve to a minimal \"Connect wallet\" prompt with no additional technical detail. Without further documentation, the exact input/output schema and purpose of this endpoint remain unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["finance","infrastructure"],"synonyms":["ACH API","premium access endpoint","micropayment API","x402 endpoint","lowpaymentfee","pay-per-call API","Base USDC API"],"warnings":["No documentation available for /api/v1/ach/163 — purpose and schema unknown","All doc/pricing/README pages return only a 'Connect wallet' prompt with no content","This specific endpoint path is not listed in the provider's public API catalog","Functionality must be inferred; actual behavior is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/163","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/163","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what this endpoint actually does, no input/output schema, and no examples. The 'Premium API Access' label is generic and the /ach/163 path is not listed on the provider's public 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'/call':13,28 '0.02':12,27,118 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':104 '20000':110 '6':115 'ACH API' 'Base USDC API' 'accept':88 'access':39,129,152 'ach':5,20 'addit':188 'address':100 'advertis':128 'ai/ml':62 'analyt':61 'api':38,58,122,151,160 'base':8,23,75,106,111 'base-network' 'beyond':147 'broader':50 'catalog':172 'categori':161 'chain':96 'challeng':81 'confirm':82 'connect':183 'contract':103 'data':60 'decim':116 'detail':190 'doc':175 'document':146,173,193 'endpoint':6,21,32,84,143,202 'equal':117 'exact':195 'finance/web3':64 'function':139 'grant':131 'immedi':132 'includ':165 'infer':63 'infrastructur':66 'input/output':196 'key':123 'label':149 'land':156 'limit':126 'list':158 'live':86 'lowpaymentfee' 'lowpaymentfee.com':34 'maxamountrequir':108 'micropay':72 'micropayment API' 'minim':182 'multipl':53 'network':9,24,76 'no-api-key' 'offer':52 'on-chain':94 'page':157,174 'part':47 'particular':167 'path':43,168 'pay':2,17,55 'pay-per-call API' 'pay-per-request':1,16,54 'payment':91,136 'per':3,18,56,119 'platform':51,154 'post':89 'post-method' 'premium':37,150 'premium access endpoint' 'price':176 'prompt':185 'provid':35 'public':171 'purpos':199 'rate':125 'readm':177 'remain':203 'request':4,19,57,90,120 'resolv':179 'resourc':40 'schema':197 'settl':69,93 'span':59 'specif':138 'specifi':99 'technic':189 'unclear':204 'unit':112 'upon':133 'usdc':15,30,78,102 'usdc-settlement' 'use':77,101 'util':67 'valid':134 'various':159 'via':10,25,70 'wallet':184 'without':191 'x402':11,26,71,80,135 'x402 endpoint' 'x402-payment'","prices":[{"id":"4143d5aa-c966-4db6-8c71-acdf72d866b5","listingId":"6a5e440d-e81c-4c68-8f1e-24236011a547","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/163","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:03.321Z"}],"sources":[{"listingId":"6a5e440d-e81c-4c68-8f1e-24236011a547","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/163","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:03.321Z","lastSeenAt":"2026-04-27T14:04:43.076Z"}],"details":{"listingId":"6a5e440d-e81c-4c68-8f1e-24236011a547","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/163 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/163"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/163"}],"useCases":["Programmatic access to a premium resource with per-call USDC micropayments","Agent-driven workflows requiring keyless, on-demand API access","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that can settle USDC payments on Base L2","Use cases requiring no-signup, no-rate-limit API access"],"notFor":["Users who need detailed API documentation before integrating","Applications requiring free or fiat-only payment methods","High-volume batch processing where per-call costs add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.407Z"},"updatedAt":"2026-04-27T14:04:43.076Z"}}