{"id":"08c80043-03f4-488a-852f-bbcb0a5229f2","shortId":"L3PYcW","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","description":"This endpoint at `/api/v1/ach/168` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific endpoint `/api/v1/ach/168` is labeled \"Premium API Access\" but its exact functionality is not documented — the path segment `ach/168` suggests it may relate to ACH (Automated Clearing House) payment processing or financial data, but this is speculative.\n\nThe endpoint is live and returns a valid x402 challenge. Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required is 20,000 base units of USDC, which with 6 decimals equals $0.02 per request. The platform advertises flat $0.02/request pricing across all endpoints with no API keys, no rate limits, and instant access.\n\nDocumentation is extremely sparse. The docs, API, pricing, 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 this specific endpoint accepts or returns beyond the generic \"Premium API Access\" label and `application/json` MIME type. The input schema indicates it accepts HTTP POST requests.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","http-post"],"categories":["finance","api-gateway"],"synonyms":["ach api","payment api","premium api access","lowpaymentfee","x402 api","micropayment api","base usdc api"],"warnings":["Endpoint functionality is completely undocumented — the purpose of /api/v1/ach/168 is unknown","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no useful content","No request or response schema available","The 'ach' path segment may imply regulated financial services (ACH payments) — verify compliance before use"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/168","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/168","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what this specific endpoint does, what inputs it expects, or what it returns. The 'ach/168' path and 'Premium API Access' label are the only clues. No OpenAPI spec, no examples, no docs content beyond 'Connect 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'/request':146 '0.02':138,145 '000':128 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':121 '20':127 '6':135 'accept':199,218 'access':71,160,207 'ach':88 'ach api' 'ach/168':82 'across':148 'advertis':143 'ai':55 'amount':124 'analyt':54 'api':5,19,51,70,153,167,206 'application/json':210 'autom':89 'base':8,22,116,129 'base usdc api' 'base-network' 'beyond':202 'call':12,26 'challeng':110 'clear':90 'collect':42 'connect':176 'content':182 'contract':120 'data':53,96 'decim':136 'descript':193 'doc':166 'document':78,161 'endpoint':6,20,30,65,102,150,198 'equal':137 'exact':74 'exampl':190 'extrem':163 'financ':58 'financi':95 'flat':144 'function':75 'gate':3,17 'generic':204 'hous':91 'http':219 'http-post' 'indic':216 'infrastructur':61 'input':214 'instant':159 'json-api' 'key':154 'label':68,208 'learn':57 'limit':157 'live':104 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':56 'maximum':123 'may':85 'micropayment api' 'mime':211 'network':117 'offer':40 'openapi':186 'page':171 'part':34 'path':80 'pay':10,24,48 'pay-per-cal':9,23 'pay-per-request':47 'payment':92,111 'payment api' 'per':11,25,49,139 'platform':38,142 'post':220 'premium':4,18,69,205 'premium api access' 'price':147,168 'process':93 'prompt':178 'protocol':46 'rate':156 'readm':170 'relat':86 'render':173 'request':50,140,221 'request/response':189 'requir':125 'return':106,201 'schema':187,215 'segment':81 'settl':113 'span':52 'spars':164 'specif':64,197 'specul':100 'suggest':83 'type':212 'unit':130 'usdc':14,28,119,132 'usdc-settlement' 'use':118 'util':62 'valid':108 'wallet':177 'web3':59 'x402':2,16,45,109 'x402 api' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"7bdfc717-8a2f-4702-a568-1d0087e28606","listingId":"08c80043-03f4-488a-852f-bbcb0a5229f2","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/168","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:02.728Z"}],"sources":[{"listingId":"08c80043-03f4-488a-852f-bbcb0a5229f2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/168","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:02.728Z","lastSeenAt":"2026-04-24T08:02:50.910Z"}],"details":{"listingId":"08c80043-03f4-488a-852f-bbcb0a5229f2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/168 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/168"},{"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/168"}],"useCases":["Accessing a pay-per-call API endpoint without API key registration","Making programmatic financial or ACH-related queries via x402 protocol","Integrating micropayment-gated services into agent workflows"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents that can settle x402 payments on Base","Users needing low-cost per-request API calls without subscriptions"],"notFor":["Users who need detailed API documentation before integrating","Applications requiring high-throughput with guaranteed SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.414Z"},"updatedAt":"2026-04-24T08:02:50.910Z"}}