{"id":"74688efb-53dd-4add-aef7-b75f61e18773","shortId":"yLrrtQ","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 suite of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/lab/results/12` is listed as \"Premium API Access\" and returns an x402 challenge requiring up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider's landing page lists four categories of APIs: 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 uniformly priced at $0.02 per request.\n\nThe specific endpoint being listed (`/api/v1/lab/results/12`) does not clearly map to any of the documented categories — it appears under a `/lab/` path that is not described on the landing page. No OpenAPI schema, request/response examples, or detailed documentation were found for this or any other endpoint. The endpoint is confirmed live via a valid 402 challenge, but the actual payload format and response structure remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-platform","data"],"synonyms":["low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","lab results API"],"warnings":["The /api/v1/lab/results/12 path is not documented on the provider's landing page — its purpose and expected input/output are unknown.","No OpenAPI spec, request body schema, or response schema is available for any endpoint on this platform.","The /pricing, /api, and /README pages returned only a 'Connect wallet' prompt with no useful content.","Actual response data quality and correctness cannot be verified without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/12","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/lab/results/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is no OpenAPI schema, no request/response examples, and no documentation for the /lab/results/12 path. The landing page documents other endpoints but not this one, making the actual functionality 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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/lab/results/12","description":"Premium API 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<x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring up to 20,000 base units of USDC ($0.02) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/lab/results/12"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/lab/results/12"}],"useCases":["Accessing premium data or lab results via a single pay-per-call transaction","Integrating low-cost API calls into agent workflows without managing API keys","Paying for API access with USDC on Base without subscriptions or commitments"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.517Z"},"updatedAt":"2026-04-22T01:02:19.746Z"}}