{"id":"597bca76-61e4-42ed-8021-a56261ef142b","shortId":"yJQEgT","kind":"x402","title":"Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC.","description":"This endpoint at `/api/v1/ach/166` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific function of the `/api/v1/ach/166` path is not documented — the listing title is simply \"Premium API Access\" and the path suggests it may relate to ACH (Automated Clearing House) payment processing or data, but no schema, input parameters, or response format are provided.\n\nThe x402 challenge is live and well-formed. It requires an exact payment of 20,000 base units of USDC (contract `0x8335…2913` on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access — you simply attach the x402 payment header to each POST request. The payment timeout is 300 seconds.\n\nDocumentation is extremely sparse. The `/docs`, `/api`, `/pricing`, and `/README` pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no usage examples. The exact functionality behind this endpoint cannot be confirmed from available materials.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","ach-endpoint","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment processing API","lowpaymentfee","x402 API","USDC micropayment","Base network API","ACH data"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only a wallet-connect prompt","The exact function of /api/v1/ach/166 is unknown; 'ACH' in the path is the only hint","No OpenAPI spec or request/response schema provided","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/166","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/166","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 pricing is clear ($0.02/request in USDC on Base), but there is zero documentation on what this endpoint actually does — no input schema, no response schema, no examples, and no description beyond the generic title. The docs pages are empty. This is effectively a stub 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'/api/v1/ach/166':32,78 '/docs':186 '/pricing':188 '/readme':190 '/request':12,26 '0.02':11,25,145 '000':133 '0x8335':139 '20':132 '2913':140 '300':179 '6':150 'ACH API' 'ACH data' 'Base network API' 'USDC micropayment' 'access':90,163 'ach':5,19,99 'ach-endpoint' 'addit':201 'advertis':154 'ai/ml':52 'analyt':51 'api':48,89,156 'attach':166 'autom':100 'avail':225 'base':8,22,71,134,142 'base-network' 'behind':218 'call':4,18 'cannot':221 'challeng':119 'clear':101 'collect':42 'confirm':223 'connect':196 'content':202 'contract':138 'crypto':55 'data':50,106 'decim':151 'document':82,181 'endpoint':6,20,30,60,220 'equal':144 'exact':129,216 'exampl':214 'extrem':183 'financ':54 'form':125 'format':114 'function':75,217 'header':170 'hous':102 'infer':53 'input':110 'instant':162 'key':157 'limit':160 'list':84 'live':121 'lowpaymentfee' 'lowpaymentfee.com':37 'materi':226 'may':96 'network':72 'no-api-key' 'offer':40 'openapi':206 'page':191 'paramet':111 'part':34 'path':79,93 'pay':2,16,45 'pay-per-cal':1,15 'pay-per-request':44 'payment':64,103,130,169,176 'payment processing API' 'per':3,17,46,146 'platform':38,153 'post':173 'premium':88 'process':104 'prompt':198 'protocol':65 'provid':116 'rate':159 'relat':97 'render':193 'request':47,147,174 'request/response':209 'requir':127 'respons':113 'schema':109,210 'second':180 'servic':58 'settl':66 'simpli':87,165 'span':49 'spars':184 'spec':207 'specif':74 'suggest':94 'timeout':177 'titl':85 'unit':135 'usag':213 'usdc':14,28,68,137,148 'usdc-settlement' 'use':61,149 'util':57 'via':9,23 'wallet':197 'well':124 'well-form':123 'x402':10,24,63,118,168 'x402 API' 'x402-payment'","prices":[{"id":"8685d108-558c-4e62-a03f-4ea8b25f7463","listingId":"597bca76-61e4-42ed-8021-a56261ef142b","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/166","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:08.223Z"}],"sources":[{"listingId":"597bca76-61e4-42ed-8021-a56261ef142b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/166","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:08.223Z","lastSeenAt":"2026-04-27T14:04:43.204Z"}],"details":{"listingId":"597bca76-61e4-42ed-8021-a56261ef142b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/166 \\\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 x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/166"},{"claim":"Platform advertises $0.02/request pricing 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/166"},{"claim":"Docs, API, pricing, and README pages render only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing ACH-related data or functionality via a single pay-per-call request","Integrating low-cost payment-gated API calls into agent workflows","Programmatic ACH lookups or processing without subscription commitments"],"bestFor":["Developers needing low-friction, keyless API access settled in crypto","AI agents that can attach x402 payment headers automatically","Use cases requiring per-call billing with no minimum spend"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume use cases where per-request pricing may add up versus flat-rate plans","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.249Z"},"updatedAt":"2026-04-27T14:04:43.204Z"}}