{"id":"1ad1c9d2-2653-457d-a705-f8fe75f6ce7a","shortId":"CQESZZ","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/56` is part of the lowpaymentfee.com platform, which offers a broad suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints use the x402 protocol to accept per-call payments in USDC on the Base network, with no API keys, no rate limits, and no subscriptions required.\n\nThe specific resource `/api/v1/lab/results/56` is listed under the generic title \"Premium API Access\" and returns `application/json`. Based on the x402 challenge, it accepts POST requests and charges a maximum of 20,000 base units of USDC (0.02 USD) per call, settled on-chain to a specified payTo address. The broader platform advertises a uniform $0.02/request pricing across all its endpoints.\n\nNote that the endpoint path suggests retrieval of a specific lab result (ID 56), but no further documentation, request schema, or response schema is available. The platform's crawled pages beyond the landing page returned only wallet-connect prompts with no additional technical documentation. Without an OpenAPI spec, example payloads, or detailed endpoint descriptions, the exact data returned and any required POST body fields remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","no-rate-limit","post-method"],"categories":["data","api-infrastructure"],"synonyms":["lab results API","premium API access","lowpaymentfee","x402 USDC endpoint","pay-per-call API","Base network API","micropayment API"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown","The endpoint path '/api/v1/lab/results/56' references a hardcoded resource ID with no explanation of what 'lab results' contain","Platform docs pages (/api, /pricing, /README) returned only wallet-connect prompts with no usable content","Cannot verify what data is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/56","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/56","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) with clear pricing ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the purpose of 'lab/results/56' is entirely opaque. Effectively a stub 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'/request':148 '0.02':12,28,128,147 '000':123 '20':122 '56':167 'Base network API' 'accept':70,114 'access':104 'across':150 'addit':196 'address':140 'advertis':144 'ai/ml':57 'analyt':56 'api':53,83,103 'application/json':107 'avail':178 'base':9,25,79,108,124 'beyond':184 'bodi':217 'broad':46 'broader':142 'call':4,20,73,131 'chain':135 'challeng':112 'charg':118 'connect':192 'crawl':182 'data':55,211 'descript':208 'detail':206 'document':171,198 'endpoint':7,23,34,64,153,157,207 'exact':210 'exampl':203 'field':218 'finance/web3':59 'generic':100 'id':166 'infer':58 'infrastructur':61 'json-response' 'key':84 'lab':5,21,164 'lab results API' 'land':186 'limit':87 'list':97 'lowpaymentfee' 'lowpaymentfee.com':41 'maximum':120 'micropayment API' 'network':80 'no-api-key' 'no-rate-limit' 'note':154 'offer':44 'on-chain':133 'openapi':201 'page':183,187 'part':38 'path':158 'pay':2,18,50 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':49 'payload':204 'payment':74 'payto':139 'per':3,13,19,29,51,72,130 'per-cal':71 'platform':42,143,180 'post':115,216 'post-method' 'premium':102 'premium API access' 'price':149 'prompt':193 'protocol':68 'rate':86 'remain':219 'request':14,30,52,116,172 'requir':91,215 'resourc':94 'respons':175 'result':6,22,165 'retriev':160 'return':106,188,212 'schema':173,176 'settl':132 'span':54 'spec':202 'specif':93,163 'specifi':138 'subscript':90 'suggest':159 'suit':47 'technic':197 'titl':101 'uniform':146 'unit':125 'unknown':220 'usd':129 'usdc':16,32,76,127 'usdc-base' 'use':65 'util':62 'via':10,26 'wallet':191 'wallet-connect':190 'without':199 'x402':11,27,67,111 'x402 USDC endpoint' 'x402-payment'","prices":[{"id":"b1d29092-f482-4bd2-bc79-0387b28af9a3","listingId":"1ad1c9d2-2653-457d-a705-f8fe75f6ce7a","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/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.482Z"}],"sources":[{"listingId":"1ad1c9d2-2653-457d-a705-f8fe75f6ce7a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/56","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.482Z","lastSeenAt":"2026-04-23T02:02:21.197Z"}],"details":{"listingId":"1ad1c9d2-2653-457d-a705-f8fe75f6ce7a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/56 \\\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 endpoint returns HTTP 402 with an x402 challenge requiring 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/56"},{"claim":"The platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/lab/results/56"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving lab result data (ID 56) via a single paid API call","Integrating pay-per-use data endpoints into agent workflows without managing API keys","Programmatic access to premium data behind x402 micropayment gating"],"bestFor":["Agents or developers wanting keyless, pay-per-call API access","Use cases requiring on-chain USDC micropayments on Base","Quick one-off data retrieval without subscription commitments"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume batch processing where per-request fees add up quickly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.131Z"},"updatedAt":"2026-04-23T02:02:21.197Z"}}