{"id":"2f60ddab-f8cd-4800-b92c-0a659ddaa3d0","shortId":"S2kaC9","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 access to a specific lab result resource (ID 66) behind an x402 paywall. The provider operates a broad suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required; callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/lab/results/66` is listed under the title \"Premium API Access\" and returns `application/json`. The x402 challenge specifies a maximum amount of 20,000 base units of USDC (asset 0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" scheme with a 300-second timeout.\n\nNote that the exact nature of the \"lab results\" data returned by this endpoint is not documented on the provider's site. The landing page catalogs many other endpoints (analytics, AI, finance, utilities) but does not describe this particular path in detail. Callers should be prepared for an unknown JSON response structure until they make a paid request.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","lab-results"],"categories":["data","api-marketplace"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lab results API"],"warnings":["No documentation exists for the /api/v1/lab/results/66 endpoint — the response schema is unknown","The endpoint path does not appear in the provider's listed API catalog on the landing page","No OpenAPI spec, no example responses, and ancillary pages (pricing, README) are empty wallet-connect stubs","The nature of 'lab results' data is unclear — could be placeholder or test content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/66","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/66","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) and pricing is clear ($0.02 USDC on Base). However, there is no documentation for this specific path's request/response schema, no OpenAPI spec, and the crawled pages beyond the landing page returned only 'Connect wallet' stubs. The purpose of 'lab/results/66' is entirely 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'/request':17,34 '0.02':16,33,78,146 '000':132 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':152 '0x8335':138 '20':131 '2913':139 '300':159 '6':142 '66':48 'Base network API' 'USDC micropayment API' 'access':40,119 'address':151 'ai':192 'ai/ml':68 'amount':129 'analyt':67,191 'api':64,90,118 'application/json':122 'asset':137 'attach':100 'base':9,26,87,133,141 'base-network' 'behind':49 'broad':57 'call':4,21 'caller':98,204 'catalog':187 'challeng':125 'data':66,71,171 'decim':143 'describ':198 'detail':203 'document':178 'endpoint':7,24,36,110,175,190 'equal':145 'exact':155,165 'financ':193 'finance/web3':70 'header':104 'id':47 'infer':69 'infrastructur':73 'json':211 'json-response' 'key':91 'lab':5,22,44,169 'lab results API' 'lab-results' 'land':185 'limit':93 'list':113 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':38 'made':149 'make':216 'mani':188 'maximum':128 'natur':166 'network':88 'no-api-key' 'note':162 'oper':55 'page':186 'paid':218 'particular':200 'path':201 'pay':2,19,61 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':60 'payment':103,147 'paywal':52 'per':3,20,62,79 'premium':117 'prepar':207 'price':76 'provid':39,54,181 'rate':92 'request':63,80,107,219 'requir':97 'resourc':46 'respons':212 'result':6,23,45,170 'return':121,172 'scheme':156 'second':160 'settl':12,29,82 'simpli':99 'site':183 'span':65 'specif':43,109 'specifi':126 'structur':213 'subscript':95 'suit':58 'timeout':161 'titl':116 'unit':134 'unknown':210 'usdc':14,31,84,136 'usdc-settlement' 'use':153 'util':74,194 'via':10,27 'x402':11,28,51,102,124 'x402 API' 'x402-payment'","prices":[{"id":"6511a63f-9ec3-4349-8a98-7e2397152465","listingId":"2f60ddab-f8cd-4800-b92c-0a659ddaa3d0","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.583Z"}],"sources":[{"listingId":"2f60ddab-f8cd-4800-b92c-0a659ddaa3d0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.583Z","lastSeenAt":"2026-04-22T01:02:20.389Z"}],"details":{"listingId":"2f60ddab-f8cd-4800-b92c-0a659ddaa3d0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/66 \\\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 provider lists APIs at $0.02/request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired 20000 in USDC (6 decimals) = $0.02, exact scheme, 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/lab/results/66"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/lab/results/66"}],"useCases":["Retrieving lab result data (ID 66) on demand with per-call USDC payment","Integrating pay-per-request data access into agent workflows without API key management","Demonstrating x402 payment protocol usage on Base"],"bestFor":["Agents or developers needing keyless, pay-per-call API access","x402 protocol integrations on the Base network","Low-cost micropayment data retrieval"],"notFor":["Use cases requiring well-documented response schemas before purchase","High-volume batch retrieval where per-call pricing is inefficient","Users who cannot transact in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.888Z"},"updatedAt":"2026-04-22T01:02:20.389Z"}}