{"id":"666981a3-df06-4d10-a526-1b64fbc1b79e","shortId":"PHDjnm","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-request with USDC at $0.02/call.","tagline":"x402-gated premium API endpoint on Base, pay-per-request with USDC at $0.02/call.","description":"This endpoint at `/api/v1/lab/results/39` is part of the lowpaymentfee.com platform, which offers a suite of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The specific resource at path `/lab/results/39` is labeled \"Premium API Access\" and returns `application/json` content. It accepts POST requests and settles payments on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).\n\nThe x402 challenge advertises a `maxAmountRequired` of 20000 base units. Since USDC uses 6 decimals, this equals $0.02 per request — consistent with the site-wide pricing of $0.02/request displayed on the landing page. The platform emphasizes no API keys, no rate limits, and instant access; payment is handled entirely via the x402 `X-PAYMENT` header. The endpoint uses the \"exact\" payment scheme with a 300-second timeout.\n\nNote: The specific functionality behind `/api/v1/lab/results/39` is not documented on the landing page, which lists analytics, AI, finance, and utility endpoints but does not mention a `/lab/results/` path. The endpoint's purpose — whether it returns lab test results, experimental data, or something else — cannot be determined from available material. The response schema is also undocumented. Treat this as a partially documented endpoint.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-response","post-method"],"categories":["data","api-infrastructure"],"synonyms":["lab results API","premium API access","x402 API","pay-per-call API","lowpaymentfee","USDC micropayment API","Base network API"],"warnings":["The /api/v1/lab/results/39 path is not listed among the documented endpoints on the landing page — its purpose is unclear.","No OpenAPI specification or response schema is available.","No example responses or detailed documentation could be found; /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/39","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, the specific resource at /lab/results/39 is not documented anywhere on the site, there is no OpenAPI spec, no response schema, and no example request/response. The endpoint's actual purpose is 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'note':168 'offer':46 'page':132,180 'part':40 'partial':227 'path':72,195 'pay':10,27,54 'pay-per-call API' 'pay-per-request':9,26,53 'payment':89,145,154,161 'per':11,28,55,116 'platform':44,134 'post':85 'post-method' 'premium':4,21,76 'premium API access' 'price':124 'protocol':52 'purpos':199 'rate':140 'request':12,29,56,86,117 'resourc':70 'respons':218 'result':205 'return':80,202 'schema':219 'scheme':162 'second':166 'settl':88 'sinc':108 'site':122 'site-wid':121 'someth':209 'span':58 'specif':69,170 'suit':48 'test':204 'timeout':167 'treat':223 'undocu':222 'unit':107 'usdc':14,31,95,109 'usdc-settlement' 'use':94,110,158 'util':67,187 'via':149 'whether':200 'wide':123 'x':153 'x-payment':152 'x402':2,19,51,99,151 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':50","prices":[{"id":"4975f2ab-71a1-40c9-8687-06fe519288eb","listingId":"666981a3-df06-4d10-a526-1b64fbc1b79e","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/lab/results/39","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 x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02 per request.","source_url":"https://lowpaymentfee.com/api/v1/lab/results/39"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/lab/results/39"}],"useCases":["Fetching premium data or results behind a per-request paywall","Agent-driven programmatic access to gated content without API keys","Micropayment-based API consumption on Base L2"],"bestFor":["Agents or applications that need keyless, pay-as-you-go API access","Developers experimenting 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