{"id":"ed6ec671-4d0a-4a41-b9cd-d9ddfa0b7d83","shortId":"tfExmV","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides pay-per-request API access using the x402 protocol, settling payments in USDC on the Base network. The specific resource `/api/v1/lab/results/49` is listed under \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). No API keys, rate limits, or subscriptions are required — each request is paid individually via an X-PAYMENT header.\n\nThe broader lowpaymentfee.com platform advertises a wide catalog of endpoints spanning 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/49`) falls under a \"lab/results\" path that is not explicitly described in the site's public catalog. Its exact output schema and data content are unknown — the x402 challenge confirms it returns `application/json` via POST, but no further documentation or example responses are available. Treat this as a generic premium data endpoint until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","http-post"],"categories":["data","api-infrastructure"],"synonyms":["low payment fee API","x402 paid API","USDC micropayment API","Base network API","pay-per-call endpoint","lab results API","premium data access"],"warnings":["The endpoint path /api/v1/lab/results/49 is not listed in the provider's public API catalog — its purpose and response format are unknown.","No OpenAPI spec, output schema, or example responses are available for this endpoint.","The /pricing, /api, and /README pages returned only a 'Connect wallet' prompt with no useful documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/49","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but the specific endpoint /api/v1/lab/results/49 has no documentation, no output schema, and no example responses. The site's public catalog does not list this path, making it effectively a stub listing with verified liveness but unknown 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'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call endpoint' 'pay-per-request':36 'payment':47,101 'per':3,18,38,69,154 'platform':106 'post':195 'premium':5,20,61,210 'premium data access' 'price':132,151 'protocol':45 'provid':35 'public':176 'quot':137 'rate':86,135 'report':117 'request':39,93,155 'requir':91 'resourc':56 'respons':202 'return':192 'schema':181 'sentiment':124 'settl':46 'site':174 'span':113 'specif':55,157 'subscript':89 'summar':127 'surfac':216 'text':126 'token':136 'treat':205 'uniform':150 'unit':76 'unknown':186 'usdc':15,30,49,78 'usdc-settlement' 'use':42 'util':142 'valid':144 'via':10,25,97,194 'web3':131 'wide':109 'x':100 'x-payment':99 'x402':11,26,44,188 'x402 paid API' 'x402-payment'","prices":[{"id":"00539aee-efd4-4af6-8d72-80bf9a5e7642","listingId":"ed6ec671-4d0a-4a41-b9cd-d9ddfa0b7d83","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.417Z"}],"sources":[{"listingId":"ed6ec671-4d0a-4a41-b9cd-d9ddfa0b7d83","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.417Z","lastSeenAt":"2026-04-23T03:32:27.385Z"}],"details":{"listingId":"ed6ec671-4d0a-4a41-b9cd-d9ddfa0b7d83","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/49 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/lab/results/49","method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"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 (asset 0x8335…) on Base network, equaling $0.02 per request.","source_url":"https://lowpaymentfee.com/api/v1/lab/results/49"},{"claim":"The site advertises uniform $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data results behind a per-call paywall without subscriptions","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Programmatic retrieval of lab/results data with instant crypto micropayments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.137Z"},"updatedAt":"2026-04-23T03:32:27.385Z"}}