{"id":"b1aad6ef-ecf5-4c4e-b12c-2a312b598361","shortId":"BGh7Mh","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request and settle in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/payments/23` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are advertised. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the \"Premium API Access\" endpoint actually returns. The platform's value proposition is low-friction, wallet-authenticated API access, but without documentation it is unclear what data or functionality this specific endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","wallet-authenticated API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition found for any endpoint","The specific function of /api/v1/payments/23 ('Premium API Access') is not described anywhere — unclear what it returns","No request body schema or response examples available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/23","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/23","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, and the landing page describes the platform's catalog and pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of the /api/v1/payments/23 endpoint is undocumented. This is effectively a stub 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'/api/v1/payments/23':110 '/docs':170 '/pricing':171 '/readme':174 '/request':13,30 '0.02':12,29,95,139 '000':128 '0x8335':133 '20':127 '2913':134 'Base network API' 'USDC API' 'accept':159 'access':116,204,221 'across':54 'actual':206 'advertis':156 'ai':64 'analysi':68 'analyt':58 'api':5,15,22,32,41,115,149,203,220 'application/json':164 'authent':219 'base':8,25,104,129,136 'base-network' 'broad':46 'call':4,21 'catalog':47 'categori':56 'challeng':122 'classif':71 'connect':180 'content':186 'convers':88 'data':57,61,229 'document':165,195,224 'embed':72 'enabl':40 'endpoint':53,91,108,158,205,234 'equal':138 'estim':82 'exact':146 'exampl':198 'exchang':77 'export':62 'extrem':167 'feed':76 'financ':73 'four':55 'friction':216 'function':231 'gas':81 'generat':89 'geocod':86 'infrastructur':84 'insight':63 'json-response' 'key':16,33,150 'learn':66 'limit':154 'list':112 'low':215 'low-frict':214 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':65 'made':142 'maxamountrequir':125 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'x402-payment'","prices":[{"id":"5e1138a2-53ec-498c-9cfb-ebbbde5f7858","listingId":"b1aad6ef-ecf5-4c4e-b12c-2a312b598361","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/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:49.186Z"}],"sources":[{"listingId":"b1aad6ef-ecf5-4c4e-b12c-2a312b598361","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:49.186Z","lastSeenAt":"2026-04-23T23:02:44.473Z"}],"details":{"listingId":"b1aad6ef-ecf5-4c4e-b12c-2a312b598361","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/23 \\\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 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/23"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off API calls with instant USDC micropayments on Base","Integrating pay-per-use endpoints into agent workflows via x402 protocol"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost per-request pricing without subscriptions"],"notFor":["Users who need detailed API documentation or response schemas before integrating","Applications requiring high-volume bulk pricing or enterprise SLAs","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.851Z"},"updatedAt":"2026-04-23T23:02:44.473Z"}}