{"id":"def13648-6b61-4154-a544-689a5a74527d","shortId":"jzvHT5","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no sign-up — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access any endpoint.\n\nThe specific endpoint at `/api/v1/payments/293` is listed as \"Premium API Access\" and returns JSON. The x402 challenge advertises a maxAmountRequired of 20000 base units of USDC (contract 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform's landing page lists 16 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 (geocoding, validation, conversion, generation). Documentation pages were largely empty (showing only \"Connect wallet\"), so the actual request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["llm","finance","geo","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","no-auth api","pay-as-you-go api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are effectively empty — only showing 'Connect wallet'","No OpenAPI or schema available; request and response formats for all endpoints are unknown","The specific function of /api/v1/payments/293 ('Premium API Access') is unclear and may be a generic or placeholder endpoint","No information on uptime, SLAs, rate limits, or data sources"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/293","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/293","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page listing, no request/response examples, and the specific purpose of the /api/v1/payments/293 endpoint (\"Premium API Access\") is vague. Docs pages returned only 'Connect wallet' with no 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'insight':177 'json':122 'key':15,31,82 'land':163 'larg':206 'learn':180 'limit':85 'list':115,165 'low payment fee' 'lowpaymentfee.com':33 'machin':179 'maxamountrequir':128 'metric':173 'micropayment api' 'network':72 'no-auth api' 'offer':42 'page':164,204 'paid':66 'pay':2,18 'pay per call api' 'pay-as-you-go api' 'pay-per-cal':1,17 'pay-per-request' 'payment':76,97,103,149 'per':3,19,64 'platform':6,22,40,161 'premium':117 'price':61,189 'proof':104 'protocol':77 'quot':194 'rate':84,192 'report':174 'request':65 'request/response':215 'requir':16,32 'return':121 'schema':216 'second':158 'sent':151 'sentiment':181 'servic':57 'show':208 'sign':89 'sign-up':88 'simpli':92 'span':48 'specif':110 'summar':184 'text':183 'timeout':159 'token':193 'unit':132 'unknown':221 'usdc':68,134,144 'usdc api' 'usdc-base' 'util':56 'valid':101,200 'validation' 'via':9,25,73 'wallet':211 'web3':188 'x':96 'x-payment':95 'x402':10,26,37,75,102,124 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"bb1eec82-6581-4891-90ea-e1253627e077","listingId":"def13648-6b61-4154-a544-689a5a74527d","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/293","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:11.199Z"}],"sources":[{"listingId":"def13648-6b61-4154-a544-689a5a74527d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/293","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:11.199Z","lastSeenAt":"2026-04-23T04:01:31.404Z"}],"details":{"listingId":"def13648-6b61-4154-a544-689a5a74527d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/293 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/payments/293"},{"claim":"Platform offers 16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time crypto token quotes and gas estimates without an API key","Running sentiment analysis or text summarization on demand with per-call USDC payment","Fetching exchange rates or price feeds for financial applications","Geocoding addresses or validating data via utility endpoints"],"bestFor":["Developers who want instant API access without sign-up or API key management","Agents and bots that can settle micropayments in USDC on Base","Low-volume or bursty workloads where flat per-request pricing is cost-effective"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Callers who cannot settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.76Z"},"updatedAt":"2026-04-23T04:01:31.404Z"}}