{"id":"f2cd2336-6565-4ba7-8476-12a523a8c573","shortId":"tr2pND","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 lowpaymentfee.com provides access to a specific lab result resource (ID 78) behind an x402 paywall. The provider operates a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per call and settled in USDC on the Base network.\n\nThe specific resource `/api/v1/lab/results/78` is listed under the title \"Premium API Access\" but does not appear in the provider's publicly listed API categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure). Its exact payload is unknown — the endpoint accepts POST requests and returns application/json, but no request or response schema is documented. The x402 challenge confirms the endpoint is live, requiring a payment of 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe provider advertises no API keys, no rate limits, and instant access. However, documentation is extremely sparse — the /api, /pricing, and /README pages all resolve to a bare \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response examples, and no description of what \"lab results\" actually contains.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","no-api-key"],"categories":["data","misc"],"synonyms":["lab results API","premium API access","lowpaymentfee","x402 data endpoint","pay-per-call API","Base USDC API","micropayment API"],"warnings":["No request or response schema documented — unknown what data this endpoint returns","The path /api/v1/lab/results/78 does not appear in the provider's publicly listed API catalog","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content","Purpose of 'lab results' is entirely unclear — could be placeholder or test data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/78","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation of what 'lab results' contains, and the resource path does not appear in the provider's own listed API catalog. Effectively a stub 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'/api/v1/lab/results/78':90 '/pricing':197 '/readme':199 '0.02':12,28,76,162 '000':152 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':172 '0x8335':157 '20':151 '300':175 '6':165 '78':46 'Base USDC API' 'accept':125 'access':38,98,189 'actual':228 'address':171 'advertis':180 'ai':113 'ai/ml':66 'analyt':65,112 'api':62,97,109,182 'appear':102 'application/json':130 'bare':205 'base':9,25,85,153,159 'behind':47 'broad':55 'call':4,20,78 'catalog':56 'categori':110 'challeng':141 'confirm':142 'connect':206 'contain':229 'content':212 'data':64,69,111 'decim':166 'descript':223 'document':138,191 'endpoint':7,23,34,124,144 'equal':161 'exact':119 'exampl':220 'extrem':193 'financ':115 'finance/web3':68 'howev':190 'id':45 'infer':67 'infrastructur':71,117 'instant':188 'json-response' 'key':183 'lab':5,21,42,226 'lab results API' 'limit':186 'list':92,108 'live':146 'lowpaymentfee' 'lowpaymentfee.com':36 'made':169 'micropayment API' 'ml':114 'network':86 'no-api-key' 'openapi':216 'oper':53 'page':200 'pay':2,18,59 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':58 'payload':120 'payment':149,167 'paywal':50 'per':3,13,19,29,60,77 'post':126 'post-method' 'premium':96 'premium API access' 'price':74 'prompt':208 'provid':37,52,105,179 'public':107 'rate':185 'request':14,30,61,127,133 'request/response':219 'requir':147 'resolv':202 'resourc':44,89 'respons':135 'result':6,22,43,227 'return':129 'schema':136 'second':176 'settl':80 'span':63 'spars':194 'spec':217 'specif':41,88 'timeout':177 'titl':95 'unit':154 'unknown':122 'usdc':16,32,82,156,163 'usdc-base' 'use':164 'util':72 'via':10,26 'wallet':207 'web3':116 'x402':11,27,49,140 'x402 data endpoint' 'x402-payment'","prices":[{"id":"4523b404-d7e8-41a5-a460-d69e7d74b5af","listingId":"f2cd2336-6565-4ba7-8476-12a523a8c573","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.500Z"}],"sources":[{"listingId":"f2cd2336-6565-4ba7-8476-12a523a8c573","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.500Z","lastSeenAt":"2026-04-22T02:32:04.341Z"}],"details":{"listingId":"f2cd2336-6565-4ba7-8476-12a523a8c573","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/78 \\\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 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/78"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/lab/results/78"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Provider lists APIs in categories: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving lab result data (ID 78) via a single paid POST request","Demonstrating x402 payment-gated API consumption on Base","Agent-driven data retrieval with per-call USDC micropayments"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that need to purchase individual data payloads without API key registration","Low-friction, keyless access to paid endpoints"],"notFor":["Users who need documented request/response schemas before integrating","Bulk data retrieval or high-throughput batch processing (no documented batch endpoints)","Anyone needing lab results beyond the single resource ID 78"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04Z"},"updatedAt":"2026-04-22T02:32:04.341Z"}}