{"id":"0e2dea6c-3b9b-4bcf-930d-22c7288fb01f","shortId":"gJfuyK","kind":"x402","title":"Pay-per-call lab results endpoint on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call lab results endpoint on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at `/api/v1/lab/results/54` is part of the lowpaymentfee.com platform, which offers a broad suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are gated via the x402 payment protocol, settling in USDC on the Base network at $0.02 per request. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/lab/results/54` is listed under the title \"Premium API Access\" but its exact functionality is not documented on the provider's site. The landing page groups endpoints into categories (Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure), but this particular path (`/lab/results/54`) does not appear in any of those categories. It may be an experimental or unlisted endpoint. The x402 challenge confirms it is live, accepts POST requests, returns `application/json`, and charges a maximum of 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call on the Base network.\n\nBecause there is no OpenAPI schema, no request/response examples, and no documentation beyond the generic landing page, the actual input parameters and response structure are unknown. Agents should treat this as a minimally documented endpoint and test with exploratory calls.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["data","api-marketplace"],"synonyms":["lab results API","lowpaymentfee","x402 API","micropayment API","pay-per-call API","USDC API","Base network API"],"warnings":["Endpoint path /api/v1/lab/results/54 is not listed in the provider's public API catalog — purpose and parameters are unknown.","No OpenAPI spec, request schema, or response schema available.","No documentation pages returned meaningful content (pricing, README, and /api pages all showed only 'Connect wallet').","The title 'Premium API Access' is generic and does not describe what this endpoint actually returns."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/54","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/54","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 no documentation for this specific path, no OpenAPI schema, no request/response examples, and the endpoint does not appear in the provider's own listed API catalog. Effectively a stub 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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/54","description":"Premium API 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<x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The provider lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02 per request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, which equals $0.02.","source_url":"https://lowpaymentfee.com/api/v1/lab/results/54"}],"useCases":["Fetching lab or experimental results via a single paid API call","Programmatic access to premium data without subscription or API key management","Agent-driven workflows that need on-demand paid data 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