{"id":"6e9f3ba2-aeab-4b9d-a413-bf8dcc007755","shortId":"aWQ6MP","kind":"x402","title":"Pay-per-request premium API access via x402 on Base network using USDC.","tagline":"Pay-per-request premium API access via x402 on Base network using USDC.","description":"This endpoint at lowpaymentfee.com provides a generic \"Premium API Access\" resource behind an x402 paywall. The provider's site advertises a broad catalog of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and instant access via the Base network.\n\nThe specific endpoint `/api/resource/41` is listed simply as \"Premium API Access\" with no further documentation about what data or functionality it returns. The x402 challenge is live and accepts payment in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a max amount of 20000 units (likely 0.02 USDC given 6 decimals). The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what `/api/resource/41` actually does. The site appears to be a demonstration or early-stage x402 payment gateway rather than a well-documented production API. Prospective callers should be aware that without documentation, the actual behavior of this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","json-response","post-method"],"categories":["general","payment-gated"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","The endpoint /api/resource/41 is not listed among the site's advertised API catalog; its actual functionality is unknown","No request or response schema provided; callers cannot know what to send or expect back","Site may be a demo or early-stage project rather than a production service"],"endpointUrl":"https://lowpaymentfee.com/api/resource/41","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/resource/41","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 well-formed, but there is zero documentation about what this endpoint actually does. No OpenAPI schema, no request/response examples, and all doc pages render only 'Connect wallet'. The endpoint path '/api/resource/41' is generic and not listed among the site's advertised API catalog. This is effectively a stub 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'0.02':69,130 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':119 '20000':127 '6':133 'Base network API' 'USDC API' 'accept':114,137 'access':7,21,38,81,96 'actual':179,212 'advertis':48 'ai':58 'amount':125 'analyt':57 'api':6,20,37,53,74,95,149,202 'appear':183 'application/json':142 'awar':207 'base':11,25,84,121 'base-network' 'behavior':213 'behind':40 'broad':50 'caller':204 'catalog':51 'categori':54 'challeng':110 'connect':158 'content':164 'contract':118 'data':56,103 'decim':134 'demonstr':187 'descript':175 'doc':148 'document':100,143,200,210 'earli':190 'early-stag':189 'endpoint':30,88,136,216 'exampl':172 'extrem':145 'financ':61 'function':105 'gateway':194 'generic':35 'given':132 'includ':55 'infrastructur':64 'instant':80 'json-response' 'key':75 'learn':60 'like':129 'limit':78 'list':91 'live':112 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':59 'max':124 'micropayment API' 'network':12,26,85 'openapi':168 'page':153 'pay':2,16 'pay-per-call API' 'pay-per-request':1,15 'payment':115,193 'paywal':43 'per':3,17,70 'post':138 'post-method' 'premium':5,19,36,94 'premium API' 'price':67,150 'product':201 'prompt':160 'prospect':203 'provid':33,45 'rate':77 'rather':195 'readm':152 'render':155 'request':4,18,71,139 'request/response':171 'resourc':39 'return':107,141 'schema':169 'simpli':92 'site':47,182 'spars':146 'specif':87 'stage':191 'substant':163 'unit':128 'unknown':218 'usdc':14,28,117,131 'usdc-payment' 'use':13,27 'util':65 'via':8,22,82 'wallet':159 'web3':62 'well':199 'well-docu':198 'without':209 'x402':9,23,42,109,192 'x402 API' 'x402-payment'","prices":[{"id":"ccab0b8b-775f-4367-812f-051f45957d46","listingId":"6e9f3ba2-aeab-4b9d-a413-bf8dcc007755","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/resource/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:48.359Z"}],"sources":[{"listingId":"6e9f3ba2-aeab-4b9d-a413-bf8dcc007755","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:48.359Z","lastSeenAt":"2026-04-22T16:30:19.324Z"}],"details":{"listingId":"6e9f3ba2-aeab-4b9d-a413-bf8dcc007755","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/41\n# Returns 402 with x402 payment challenge.\n# Include X-PAYMENT header with valid payment to access the resource.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge accepts USDC on Base with maxAmountRequired of 20000 units","source_url":"https://lowpaymentfee.com/api/resource/41"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Testing x402 payment flows against a live endpoint","Exploring pay-per-request API patterns on Base network","Integrating USDC micropayments into agent workflows"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that need a low-cost test endpoint for payment integration","Projects exploring crypto-native API monetization"],"notFor":["Production workloads requiring documented, reliable API contracts","Users needing detailed request/response schemas before integration","Anyone without a Base network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:01.957Z"},"updatedAt":"2026-04-22T16:30:19.324Z"}}