{"id":"9b048a17-33c0-434e-a7a1-3488bdd0676f","shortId":"zLkg8u","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/resource/49` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — each call is individually paid for via the X-PAYMENT header.\n\nThe broader lowpaymentfee.com platform advertises 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 listed endpoints are priced at $0.02 per request. However, the specific `/api/resource/49` endpoint does not clearly map to any of these named services — its exact functionality is not documented beyond the generic \"Premium API Access\" label.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what data or computation `/api/resource/49` actually returns. The endpoint is confirmed live (returns a valid x402 402 challenge), but without documentation it is difficult to know what to send or what to expect back.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["The exact functionality of /api/resource/49 is undocumented — 'Premium API Access' is the only description available.","No OpenAPI schema, request format, or response examples are provided anywhere.","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no technical content.","Cannot verify what data or computation this endpoint actually returns without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/resource/49","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of /api/resource/49 is completely undocumented. The docs pages are empty beyond a wallet-connect 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'/api/resource/49':56,170,234 '/docs':200 '/pricing':202 '/readme':204 '/request':13,28 '0.02':12,27,87,164 '000':82 '0x8335':72 '20':81 '2913':73 '402':246 '6':92 'Base network API' 'USDC micropayment API' 'accept':63 'access':7,22,42,61,193 'across':122 'actual':235 'advertis':120 'ai':132 'amount':79 'analysi':136 'analyt':126 'api':6,21,40,60,95,192 'back':263 'base':9,24,50,75,83 'base-network' 'beyond':188 'broader':117 'call':4,19,105 'categori':124 'challeng':247 'classif':139 'clear':174 'collect':34 'commit':101 'comput':233 'confirm':240 'connect':210 'contract':71 'convers':156 'crypto-paid endpoint' 'data':125,129,231 'decim':93 'descript':228 'detail':217 'difficult':253 'document':187,195,250 'embed':140 'endpoint':41,54,121,160,171,238 'equal':86 'estim':150 'exact':183 'exampl':225 'exchang':145 'expect':262 'export':130 'extrem':197 'feed':144 'financ':141 'four':123 'function':184 'gas':149 'generat':157 'generic':190 'geocod':154 'header':115 'host':32 'howev':167 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'x402':11,26,45,245 'x402 API' 'x402-payment'","prices":[{"id":"6fdb9c68-304c-4a77-9804-3d84fc0ec7f8","listingId":"9b048a17-33c0-434e-a7a1-3488bdd0676f","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:45.993Z"}],"sources":[{"listingId":"9b048a17-33c0-434e-a7a1-3488bdd0676f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:45.993Z","lastSeenAt":"2026-04-22T20:00:44.752Z"}],"details":{"listingId":"9b048a17-33c0-434e-a7a1-3488bdd0676f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/49 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/resource/49"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/resource/49"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or computation without API key registration","Making one-off paid API calls settled in USDC on Base","Integrating pay-per-request endpoints into agent workflows via x402"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or schemas before integrating","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or rate guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.793Z"},"updatedAt":"2026-04-22T20:00:44.752Z"}}