{"id":"d30443c0-8b0e-4906-b2bd-8b19a9794a3f","shortId":"bS9dv3","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network 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 data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network using the x402 payment protocol. No API keys, subscriptions, or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/96` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) on Base. The platform also advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export, all at the same $0.02 price point.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 the \"Premium API Access\" endpoint actually returns. The platform appears live (402 challenge confirmed), but without documentation it is difficult to know what data or functionality any given endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","crypto-gas-estimates"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API access","no-key API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'","No OpenAPI or request/response schema provided for any endpoint","The specific endpoint '/api/v1/transactions/96' has no description beyond 'Premium API Access' — its actual functionality is unknown","Cannot verify what data or service any endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/96","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/transactions/96","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually does or returns. No OpenAPI schema, no request/response examples, and all doc pages render only 'Connect wallet'. The listing is effectively a 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'/api/v1/transactions/96':106 '/docs':172 '/pricing':173 '/readme':176 '/request':13,30 '0.02':12,29,68,128,164 '000':122 '20':121 '402':116,214 '6':132 'Base network API' 'USDC micropayment API' 'access':112,206 'across':54 'actual':208 'advertis':91,139 'ai-inference' 'ai/ml':57 'also':138 'analysi':143 'analyt':56 'api':5,15,22,32,41,84,111,205 'appear':212 'attach':94 'base':8,25,76,123,135 'broad':46 'call':4,21 'caller':92 'catalog':47 'challeng':117,215 'classif':146 'classification' 'confirm':216 'connect':182 'convers':156 'crypto API access' 'crypto-gas-estimates' 'data':55,158,226 'data-analytics' 'decim':133 'descript':200 'detail':189 'difficult':222 'document':167,219 'embed':147 'embeddings' 'enabl':40 'endpoint':53,64,104,140,207,231 'estim':153 'exampl':197 'exchang':150 'export':159 'extrem':169 'feed':149 'finance-data' 'finance/web3':59 'function':228 'gas':152 'geocod':154 'geocoding' 'given':129,230 'header':98 'i.e':127 'infer':58 'infrastructur':61 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'x402-payment'","prices":[{"id":"fd34631e-310a-4c13-909f-63df6627c6de","listingId":"d30443c0-8b0e-4906-b2bd-8b19a9794a3f","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/transactions/96","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:17.937Z"}],"sources":[{"listingId":"d30443c0-8b0e-4906-b2bd-8b19a9794a3f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/96","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:17.937Z","lastSeenAt":"2026-04-22T16:32:15.759Z"}],"details":{"listingId":"d30443c0-8b0e-4906-b2bd-8b19a9794a3f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/96 \\\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":"402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/96"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto gas estimates and token price feeds","Geocoding and data validation utilities on a per-call payment basis","Exporting analytics data and generating reports with micropayments"],"bestFor":["Developers who want instant API access without signup or API keys","Agents and bots that can settle payments via x402 on Base","Low-volume or sporadic API consumers who prefer pay-per-use over subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Developers without a Base-network USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.518Z"},"updatedAt":"2026-04-22T16:32:15.759Z"}}