{"id":"6a47f1a2-664f-4572-9f92-a972020bca26","shortId":"BdBnnr","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 x402-enabled endpoint at `/api/v1/lab/results/71` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance, and utility services. Each call is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request, with no API keys, rate limits, or subscriptions required.\n\nThe specific endpoint `/api/v1/lab/results/71` is listed under the title \"Premium API Access\" but its exact data payload is not documented in the available crawl material. The 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. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires an exact payment of 20,000 base units of USDC (6 decimals → $0.02) to the address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base.\n\nBecause this specific resource path (`/lab/results/71`) does not appear in the site's public API listing and no output schema or documentation describes what it returns, the actual response format and content are unknown. Agents should treat this as an opaque JSON endpoint until further documentation is available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["data","api-infrastructure"],"synonyms":["lab results API","premium API access","lowpaymentfee","pay-per-call API","x402 USDC endpoint","Base network API","micropayment API"],"warnings":["Endpoint path /api/v1/lab/results/71 is not listed on the provider's public API catalog — purpose and response format are unknown.","No OpenAPI spec, output schema, or example responses are available.","The 'Premium API Access' title is generic and does not describe what data is returned.","Other crawled pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/71","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/71","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 pricing is clear ($0.02 USDC on Base), but the specific endpoint /api/v1/lab/results/71 has no documentation, no output schema, and no example responses. The endpoint path does not appear in the site's own API listing, making it effectively a stub 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'/lab/results/71':192 '0.02':12,28,81,152,180 '000':173 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':184 '20':172 '6':178 'Base network API' 'accept':163 'access':104 'actual':214 'address':183 'advertis':121 'agent':221 'ai/ml':59 'analysi':130 'analyt':58 'api':55,86,103,201 'appear':195 'avail':115,234 'base':9,25,71,174,186 'broader':119 'call':4,20,66 'categori':122 'challeng':157 'classif':133 'coin':76 'confirm':158 'content':218 'convers':145 'cost':79 'crawl':116 'data':57,108,126 'decim':179 'describ':209 'document':112,208,232 'embed':134 'enabl':36 'endpoint':7,23,37,95,160,229 'estim':142 'exact':107,169 'exchang':137 'export':127 'feed':136 'financ':61 'format':216 'gas':141 'generat':147 'geocod':143 'includ':123 'infer':60 'insight':128 'json':228 'json-response' 'key':87 'lab':5,21 'lab results API' 'limit':89 'list':98,202 'live':162 'lowpaymentfee' 'lowpaymentfee.com':44 'materi':117 'metric':124 'micropayment API' 'network':72 'no-api-key' 'offer':47 'opaqu':227 'output':205 'part':41 'path':191 'pay':2,18,52 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':51 'payload':109 'payment':170 'per':3,13,19,29,53,82 'platform':45,120 'point':154 'post':164 'post-method' 'premium':102 'premium API access' 'price':135,153 'public':200 'quot':140 'rate':88,138 'report':125 'request':14,30,54,83,165 'requir':92,167 'resourc':190 'respons':215 'result':6,22 'return':212 'schema':206 'sentiment':129 'servic':64 'settl':68 'site':198 'span':56 'specif':94,189 'subscript':91 'suit':49 'summar':132 'text':131 'titl':101 'token':139 'treat':223 'unit':175 'unknown':220 'usd':75 'usdc':16,32,74,177 'usdc-base' 'use':73 'util':63 'valid':144 'via':10,26 'x402':11,27,35,156 'x402 USDC endpoint' 'x402-enabled':34 'x402-payment'","prices":[{"id":"0d7fcf40-4b88-43d3-9771-cd64237b0555","listingId":"6a47f1a2-664f-4572-9f92-a972020bca26","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/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.700Z"}],"sources":[{"listingId":"6a47f1a2-664f-4572-9f92-a972020bca26","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/71","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.700Z","lastSeenAt":"2026-04-23T00:32:57.904Z"}],"details":{"listingId":"6a47f1a2-664f-4572-9f92-a972020bca26","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/71 \\\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 a 402 challenge requesting 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/71"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/lab/results/71"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching lab or analytical results behind a per-call paywall","Programmatic access to premium data without subscription management","Agent-driven data retrieval with automatic crypto micropayments"],"bestFor":["Agents that need one-off data lookups without managing API keys","Developers testing x402 payment flows on Base","Low-volume consumers who prefer pay-per-use over subscriptions"],"notFor":["High-volume batch processing where per-call fees add up quickly","Users who need detailed documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.751Z"},"updatedAt":"2026-04-23T00:32:57.904Z"}}