{"id":"c2de43ed-1e1d-47e5-9929-d0e20248caa8","shortId":"ugpLDQ","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides x402-protocol pay-per-call API access. The specific resource `/api/v1/lab/results/43` is listed as \"Premium API Access\" and returns JSON content gated behind a USDC micropayment on the Base network. The x402 challenge confirms the endpoint is live and accepts exact-scheme payments of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request. The platform emphasizes no API keys, no rate limits, no minimums, and instant access via the Base network.\n\nHowever, this specific endpoint (`/api/v1/lab/results/43`) is not listed among the documented API categories on the landing page, so its exact functionality is unclear. The path suggests it may return lab or experimental results for a specific resource ID (43). No OpenAPI schema, request/response examples, or detailed documentation were found for this endpoint. The crawled /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","json-response","no-api-key"],"categories":["data","infrastructure"],"synonyms":["premium API","paid API","micropayment API","x402 endpoint","USDC API","Base network API","lab results API","pay-per-call"],"warnings":["The specific endpoint /api/v1/lab/results/43 is not listed among the documented APIs on the landing page — its exact functionality is unknown.","No OpenAPI spec, request body schema, or response examples are available.","The /api, /pricing, and /README pages returned no useful content beyond a wallet-connect prompt.","The purpose of 'lab/results/43' is unclear — it may be experimental or a placeholder."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/43","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/43","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). However, there is no documentation for this specific endpoint path, no OpenAPI schema, no request/response examples, and the crawled docs pages were empty. The endpoint path '/api/v1/lab/results/43' does not appear in the site's listed APIs, making its purpose 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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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/43"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/43"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing gated premium data or lab results via a single micropayment","Integrating pay-per-request APIs into agent workflows without managing API keys","Programmatic retrieval of JSON 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