{"id":"df6bb961-b451-4ca2-8733-f3ed10a87790","shortId":"y28gN2","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/keys/19` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach an X-PAYMENT header with each request.\n\nThe platform advertises four endpoint 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 share the same $0.02/request pricing. The site claims no rate limits and instant access.\n\nImportant caveat: the `/api/v1/keys/19` path does not clearly map to any of the named endpoints on the landing page. Its description is simply \"Premium API Access,\" and no documentation, OpenAPI spec, or request/response schema was found beyond the x402 challenge. The crawled /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional content. Without documentation it is unclear what this specific endpoint actually returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The endpoint path /api/v1/keys/19 does not match any named endpoint on the landing page; its actual functionality is unknown","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","No example requests or responses are available to verify what the endpoint returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/19","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/keys/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific endpoint's purpose is ambiguous. The /api, /pricing, and /README pages are empty behind a wallet 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challenge returns maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base, equaling $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/keys/19"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The site advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without subscriptions","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with micropayments"],"bestFor":["Agents or developers who want zero-signup, pay-as-you-go API access","Use cases requiring occasional or bursty API calls without committing to a subscription","Crypto-native workflows that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-call pricing may add up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:06.388Z"},"updatedAt":"2026-04-22T09:02:14.462Z"}}