{"id":"b2c2d913-a741-4e9b-a2c7-e6860e109827","shortId":"sUMsTs","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 premium API access to lab results (resource ID 27) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with an exact-payment scheme.\n\nThe specific endpoint `/api/v1/lab/results/27` is not listed on the provider's landing page, which instead advertises a broad catalog of APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access. The x402 challenge for this particular endpoint shows a maxAmountRequired of 20000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site-wide pricing.\n\nThe endpoint is live and returns a proper 402 challenge. However, there is no documentation describing what \"lab results\" resource 27 actually contains, what input the POST body expects, or what the response schema looks like. The provider's landing page does not mention a `/lab/results` category at all, making this endpoint's purpose unclear. Without an OpenAPI spec, request/response examples, or dedicated docs, the practical utility for agents is limited to trial-and-error.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","json-response","no-api-key","post-method"],"categories":["data","api-marketplace"],"synonyms":["lab results API","x402 premium API","pay-per-request API","lowpaymentfee","USDC micropayment API","Base network API","402 payment endpoint"],"warnings":["The /api/v1/lab/results/27 path is not listed on the provider's landing page among their advertised APIs","No request body schema or response schema is available — callers cannot know what to send or what to expect","No OpenAPI spec, README, or dedicated documentation was found","The purpose of 'lab results resource 27' is entirely undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/27","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/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation for this specific /lab/results/27 resource — no request schema, no response schema, no description of what it returns. The endpoint path doesn't appear in the provider's own catalog. This is effectively a stub 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'look':207 'lowpaymentfee' 'lowpaymentfee.com':38 'make':222 'maxamountrequir':154 'mention':216 'network':67 'no-api-key' 'openapi':230 'page':91,213 'particular':150 'pay':2,19 'pay-per-cal':1,18 'pay-per-call' 'pay-per-request API' 'payment':52,61,77 'per':3,20,133 'post':56,199 'post-method' 'practic':238 'premium':40 'price':111,130,172 'proper':180 'protocol':53 'provid':39,88,210 'purpos':226 'quot':116 'rate':114,140 'request':57,134 'request/response':232 'resourc':46,192 'respons':205 'result':6,23,45,191 'return':59,178 'schema':206 'scheme':78 'sentiment':104 'settl':12,29,63 'show':152 'site':170 'site-wid':169 'span':100 'spec':231 'specif':80 'summar':106 'token':115 'trial':246 'trial-and-error':245 'unclear':227 'unit':158 'usdc':14,31,69,160 'usdc-settlement' 'use':68 'util':121,239 'valid':123 'via':10,27,49 'web3':110 'wide':171 'without':228 'x402':11,28,51,146 'x402 premium API' 'x402-payment'","prices":[{"id":"fa06f159-f3cb-41ad-b338-cd9408897cc1","listingId":"b2c2d913-a741-4e9b-a2c7-e6860e109827","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/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.279Z"}],"sources":[{"listingId":"b2c2d913-a741-4e9b-a2c7-e6860e109827","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.279Z","lastSeenAt":"2026-04-22T01:02:19.823Z"}],"details":{"listingId":"b2c2d913-a741-4e9b-a2c7-e6860e109827","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/27 \\\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 maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/27"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/27"},{"claim":"The provider advertises APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching lab results data (resource 27) with per-call USDC micropayment","Integrating pay-per-use data endpoints into agent workflows without API key management","Exploring x402 protocol-based API consumption on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Low-volume consumers who prefer micropayments over subscriptions"],"notFor":["Users who need documented, well-specified API contracts before integration","High-volume batch processing where per-call pricing adds up","Anyone needing lab results with a clear, documented schema"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.382Z"},"updatedAt":"2026-04-22T01:02:19.823Z"}}