{"id":"3c8e8576-f511-40fe-a013-f761b1078c1c","shortId":"kPHr24","kind":"x402","title":"Pay-per-call lab results endpoint on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call lab results endpoint on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at `/api/v1/lab/results/37` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network at $0.02 per request with no API keys, no rate limits, and no subscriptions required.\n\nThe specific resource `/api/v1/lab/results/37` is listed under the title \"Premium API Access\" but its exact data payload is unclear — the path suggests it returns results for a specific lab or experiment identified by ID 37. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires a maximum payment of 20,000 base units of USDC (0.02 USD) on Base (asset contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The response MIME type is `application/json`.\n\nThe broader platform advertises categories including 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. No OpenAPI schema, detailed documentation, or example responses were found for any endpoint, so the exact request/response shape for this particular resource is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["data","api-marketplace"],"synonyms":["lab results API","premium API access","lowpaymentfee","x402 API","micropayment API","pay-per-call API","USDC API"],"warnings":["No documentation or OpenAPI schema available for this endpoint","The exact purpose and response format of /api/v1/lab/results/37 is unknown — 'Premium API Access' is a generic label","No example responses or request body schemas were found anywhere on the site","The /api, /pricing, and /README pages returned no meaningful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/37","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI schema, no documentation, no example request/response, and the purpose of '/api/v1/lab/results/37' is ambiguous. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful 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'0.02':12,28,79,151,198 '000':146 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':157 '20':145 '37':127 'USDC API' 'accept':136 'access':104 'advertis':167 'ai/ml':57 'analysi':176 'analyt':56 'api':53,84,103 'application/json':163 'asset':155 'base':9,25,76,147,154 'base-network' 'broad':46 'broader':165 'call':4,20 'catalog':47 'categori':168 'challeng':130 'classif':179 'confirm':131 'contract':156 'convers':191 'crypto':60 'data':55,108,172 'detail':204 'document':205 'embed':180 'endpoint':7,23,34,65,133,213 'estim':188 'exact':107,216 'exampl':207 'exchang':183 'experi':123 'export':173 'feed':182 'financ':59 'found':210 'gas':187 'generat':193 'geocod':189 'id':126 'identifi':124 'includ':169 'infer':58 'insight':174 'json-response' 'key':85 'lab':5,21,121 'lab results API' 'limit':88 'list':98 'live':135 'lowpaymentfee' 'lowpaymentfee.com':41 'maximum':142 'metric':170 'micropayment API' 'mime':160 'network':77 'no-api-key' 'offer':44 'openapi':202 'part':38 'particular':221 'path':113 'pay':2,18,50 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':49 'payload':109 'payment':69,143 'per':3,13,19,29,51,80 'platform':42,166 'point':200 'post':137 'post-method' 'premium':102 'premium API access' 'price':181,199 'protocol':70 'quot':186 'rate':87,184 'report':171 'request':14,30,52,81,138 'request/response':217 'requir':92,140 'resourc':95,222 'respons':159,208 'result':6,22,117 'return':116 'schema':203 'sentiment':175 'servic':63 'settl':71 'shape':218 'span':54 'specif':94,120 'subscript':91 'suggest':114 'summar':178 'text':177 'titl':101 'token':185 'type':161 'unclear':111 'unit':148 'unknown':224 'usd':152 'usdc':16,32,73,150 'usdc-settlement' 'use':66 'util':62 'valid':190 'via':10,26 'x402':11,27,68,129 'x402 API' 'x402-payment'","prices":[{"id":"efe09f58-153c-4c64-afa9-6f458914b32d","listingId":"3c8e8576-f511-40fe-a013-f761b1078c1c","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.970Z"}],"sources":[{"listingId":"3c8e8576-f511-40fe-a013-f761b1078c1c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.970Z","lastSeenAt":"2026-04-22T05:32:12.985Z"}],"details":{"listingId":"3c8e8576-f511-40fe-a013-f761b1078c1c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/37 \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/37"},{"claim":"All endpoints 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"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/lab/results/37"}],"useCases":["Fetching lab or experiment results on-demand with per-call payment","Integrating pay-per-use data endpoints into agent workflows without managing API keys","Accessing structured JSON data behind a crypto-native paywall"],"bestFor":["Agents or developers who want keyless, pay-per-request API access","Use cases requiring low-friction micropayments on Base L2","Scenarios where subscription-free, on-demand data retrieval is preferred"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume batch processing where per-call pricing becomes expensive","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.897Z"},"updatedAt":"2026-04-22T05:32:12.985Z"}}