{"id":"e20808bd-2c61-410f-bbbc-955ced70c176","shortId":"sJnUee","kind":"x402","title":"Pay-per-call lab results endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call lab results endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides access to a \"lab results\" resource (ID 6) behind an x402 paywall. The provider operates a broad suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required; callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/lab/results/6` is listed under the title \"Premium API Access\" but its exact data payload is not documented in the crawled material. The x402 challenge confirms it is live, accepts POST requests, and requires up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02) per call. The response MIME type is `application/json`. Because the provider's site offers no OpenAPI schema, detailed field documentation, or example responses for this particular endpoint, the precise structure of the returned JSON is unknown.\n\nThe provider's landing page advertises a uniform $0.02/request pricing model across all endpoints, with no minimums or commitments. Settlement occurs on the Base L2 network using USD Coin (USDC).","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","lab-results"],"categories":["data","api-infrastructure"],"synonyms":["lab results API","premium API access","lowpaymentfee","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The exact nature of 'lab results' data returned by /api/v1/lab/results/6 is undocumented","No example request or response bodies are available from the provider","This endpoint does not appear in the provider's own landing-page catalog of APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/6","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/6","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 network, but there is no OpenAPI schema, no documented request/response format, and no explanation of what 'lab results/6' actually returns. The endpoint is effectively a stub listing with minimal useful 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'/request':17,34,203 '0.02':16,33,77,157,202 '000':146 '0x8335':151 '20':145 '2913':152 '6':47,155 'Base network API' 'USDC micropayment API' 'accept':138 'access':40,118 'across':206 'advertis':199 'ai/ml':67 'analyt':66 'api':63,89,117 'application/json':165 'attach':99 'base':9,26,86,147,154,218 'base-network' 'behind':48 'broad':56 'call':4,21,159 'caller':97 'challeng':133 'coin':223 'commit':213 'confirm':134 'crawl':129 'data':65,70,122 'decim':156 'detail':175 'document':126,177 'endpoint':7,24,36,109,184,208 'exact':121 'exampl':179 'field':176 'finance/web3':69 'header':103 'id':46 'infer':68 'infrastructur':72 'json':191 'json-response' 'key':90 'l2':219 'lab':5,22,43 'lab results API' 'lab-results' 'land':197 'limit':92 'list':112 'live':137 'lowpaymentfee' 'lowpaymentfee.com':38 'materi':130 'mime':162 'minimum':211 'model':205 'network':87,220 'no-api-key' 'occur':215 'offer':171 'openapi':173 'oper':54 'page':198 'particular':183 'pay':2,19,60 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':59 'payload':123 'payment':102 'paywal':51 'per':3,20,61,78,158 'post':139 'precis':186 'premium':116 'premium API access' 'price':75,204 'provid':39,53,168,195 'rate':91 'request':62,79,106,140 'requir':96,142 'resourc':45 'respons':161,180 'result':6,23,44 'return':190 'schema':174 'settl':12,29,81 'settlement':214 'simpli':98 'site':170 'span':64 'specif':108 'structur':187 'subscript':94 'suit':57 'titl':115 'type':163 'uniform':201 'unit':148 'unknown':193 'usd':222 'usdc':14,31,83,150,224 'usdc-settlement' 'use':221 'util':73 'via':10,27 'x402':11,28,50,101,132 'x402 paid endpoint' 'x402-payment'","prices":[{"id":"18ffd92e-986d-4710-8acd-6d4879a60976","listingId":"e20808bd-2c61-410f-bbbc-955ced70c176","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.548Z"}],"sources":[{"listingId":"e20808bd-2c61-410f-bbbc-955ced70c176","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.548Z","lastSeenAt":"2026-04-23T02:02:21.262Z"}],"details":{"listingId":"e20808bd-2c61-410f-bbbc-955ced70c176","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/6 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <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 402 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/6"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/lab/results/6"},{"claim":"All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving lab result data (ID 6) on demand with per-call USDC micropayments","Integrating pay-per-use data endpoints into agent workflows without managing API keys","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that need keyless, pay-as-you-go data access","Projects already operating on the Base L2 network with USDC"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who prefer subscription-based pricing over per-call payments","Anyone without access to USDC on Base for payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.993Z"},"updatedAt":"2026-04-23T02:02:21.262Z"}}