{"id":"c494268a-09fc-40a8-8813-da6d72dd0e28","shortId":"nwZLJZ","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/347` returns a valid x402 challenge (HTTP 402) requesting payment of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) via the \"exact\" scheme. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nHowever, the crawled documentation pages (/docs, /api, /pricing, /README) all returned only a \"Connect wallet\" stub with no actual API documentation, request/response schemas, or usage examples. It is unclear what specific data or functionality this particular `/payments/347` endpoint returns, as the platform's landing page does not list it among its advertised APIs. Without documentation or schema details, agents must discover behavior empirically.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment endpoint"],"warnings":["No API documentation available — all doc pages (/docs, /api, /pricing, /README) return only 'Connect wallet' stubs","The specific endpoint /api/v1/payments/347 is not listed among the platform's advertised APIs, making its purpose unclear","No request or response schema provided; behavior must be discovered empirically","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/347","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/payments/347","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no API documentation, no request/response schema, and the /payments/347 path is not listed among the platform's advertised endpoints. All doc pages return only 'Connect wallet' stubs, making it impossible to determine what this endpoint actually 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'/api/v1/payments/347':98 '/docs':153 '/payments/347':184 '/pricing':155 '/readme':156 '/request':13,28 '0.02':12,27,76,123 '000':112 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':134 '0x8335':117 '20':111 '2913':118 '300':137 '402':105 '402 payment endpoint' '6':121 'Base network API' 'USDC micropayment API' 'accept':142 'access':7,22,38 'actual':166 'address':133 'advertis':199 'agent':206 'ai':60 'among':197 'analyt':59 'api':6,21,37,88,167,200 'application/json':147 'base':9,24,84,113,120 'behavior':209 'call':4,19 'categori':56 'challeng':103 'commit':93 'connect':161 'crawl':150 'crypto-paid API' 'data':58,179 'decim':122 'detail':205 'direct':131 'discov':208 'document':151,168,202 'empir':210 'endpoint':32,49,69,97,141,185 'exact':126 'exampl':173 'financ':63 'function':181 'howev':148 'http':104 'includ':57 'infrastructur':66 'json-api' 'key':89 'land':191 'learn':62 'limit':91 'list':195 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'mani':48 'must':207 'network':85 'no-api-key' 'offer':50 'one':46 'page':152,192 'paid':79 'particular':183 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,107,129 'per':3,18,77 'platform':53,72,189 'post':143 'post-method' 'premium':5,20,36 'price':74 'protocol':43 'provid':35 'rate':90 'request':78,106,144 'request/response':169 'requir':94 'return':99,146,158,186 'schema':170,204 'scheme':127 'second':138 'span':55 'specif':96,178 'stub':163 'timeout':139 'unclear':176 'unit':114 'usag':172 'usdc':15,30,81,116 'usdc-base' 'util':67 'valid':101 'via':10,25,39,124 'wallet':162 'web3':64 'without':201 'x402':11,26,41,102 'x402 API' 'x402-payment'","prices":[{"id":"3dc5611c-3308-4dd1-882a-08e60fc818bc","listingId":"c494268a-09fc-40a8-8813-da6d72dd0e28","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/payments/347","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:25.327Z"}],"sources":[{"listingId":"c494268a-09fc-40a8-8813-da6d72dd0e28","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/347","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:25.327Z","lastSeenAt":"2026-04-23T12:31:28.572Z"}],"details":{"listingId":"c494268a-09fc-40a8-8813-da6d72dd0e28","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/347 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02/request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/347"},{"claim":"Payment directed to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/payments/347"}],"useCases":["Programmatic access to premium API services without traditional API key management","Agent-driven pay-per-call workflows settled in USDC on Base","Accessing data, AI, finance, or utility endpoints with micropayments"],"bestFor":["Agents or developers who want keyless, pay-per-use API access","Crypto-native workflows that can settle USDC on Base","Low-commitment, no-subscription API consumption"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing at $0.02 may be expensive compared to bulk plans","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.149Z"},"updatedAt":"2026-04-23T12:31:28.572Z"}}