{"id":"8258af66-cf00-4626-8112-a008b24bc580","shortId":"rhZC7v","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/86` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific resource at path `/lab/results/86` 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 translates to $0.02 per request — consistent with the site-wide pricing of $0.02/request shown on the landing page. Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are required; access is granted purely through the x402 payment header.\n\nThe broader lowpaymentfee.com platform offers endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, this specific `/lab/results/86` endpoint is not listed among the publicly documented APIs on the landing page, so its exact functionality is unclear. The \"lab\" path segment suggests it may be an experimental or test endpoint. No OpenAPI schema, detailed documentation, or example responses are available for this resource.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method","no-api-key"],"categories":["api","data"],"synonyms":["lowpaymentfee","low payment fee API","x402 paid API","USDC micropayment API","Base network API","pay-per-call API","premium data endpoint"],"warnings":["The /api/v1/lab/results/86 path is not listed among the publicly documented endpoints on the landing page — it may be experimental or a test resource.","No OpenAPI spec, request schema, or response schema is available for this endpoint.","No documentation beyond the generic landing page exists; /pricing, /README, and /api pages all just show 'Connect wallet' with no content.","Exact purpose and data returned by this endpoint are unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/86","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/86","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, no OpenAPI schema, no example request/response, and the specific /lab/results/86 path is not listed among the site's publicly documented APIs. The endpoint's actual functionality is 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'/call':17,34 '/lab/results/86':70,201 '/request':125 '0.02':16,33,113,124,195 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':94 '20000':102 '300':140 '6':108 'Base network API' 'USDC micropayment API' 'accept':81 'access':75,151 'advertis':98 'ai/ml':59 'among':206 'analysi':173 'analyt':58 'api':5,22,55,74,144,210 'application/json':78 'avail':243 'base':8,25,89,103 'base-network' 'broader':161 'challeng':97 'classif':176 'collect':46 'consist':116 'content':79 'contract':93 'convers':188 'data':57,169 'decim':109 'detail':237 'document':209,238 'embed':177 'endpoint':6,23,36,165,202,233 'estim':185 'exact':136,217 'exampl':240 'exchang':180 'experiment':230 'export':170 'feed':179 'finance/web3':61 'function':218 'gas':184 'gate':3,20 'generat':190 'geocod':186 'grant':153 'header':159 'howev':198 'infer':60 'infrastructur':63 'insight':171 'json-response' 'key':145 'lab':222 'label':72 'land':129,213 'limit':148 'list':205 'low payment fee API' 'lowpaymentfee' 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'x402-protocol':48","prices":[{"id":"a24582c3-95f5-44ec-9202-3b8c5a136700","listingId":"8258af66-cf00-4626-8112-a008b24bc580","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/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.610Z"}],"sources":[{"listingId":"8258af66-cf00-4626-8112-a008b24bc580","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/86","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.610Z","lastSeenAt":"2026-04-22T02:32:04.485Z"}],"details":{"listingId":"8258af66-cf00-4626-8112-a008b24bc580","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/86 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","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 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/86"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/lab/results/86"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or lab results behind a micropayment wall","Programmatic pay-per-request API consumption without API key management","Agent-driven workflows that need on-demand paid data retrieval"],"bestFor":["Developers wanting zero-friction API access without subscriptions or API keys","AI agents that can settle x402 payments autonomously on Base","Use cases requiring low-cost per-request pricing ($0.02)"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Bulk data retrieval where per-request costs would accumulate significantly","Anyone unable to pay with USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.875Z"},"updatedAt":"2026-04-22T02:32:04.485Z"}}