{"id":"01e3e1bd-82c5-40c7-a064-e280dae0ae64","shortId":"CekLn3","kind":"x402","title":"Pay-per-call lab results endpoint on Base via x402, settling in USDC at $0.02/request.","tagline":"Pay-per-call lab results endpoint on Base via x402, settling in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" to lab results (resource ID 85) 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 a maximum charge of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call 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 priced at $0.02 per request. The platform emphasizes no API keys, no rate limits, and instant access.\n\nThe specific endpoint `/api/v1/lab/results/85` is not explicitly listed on the site's landing page among the advertised API categories, so its exact response payload is unclear. It may be a test or internal endpoint. No OpenAPI schema, request body documentation, or example responses are available for this particular resource. The x402 challenge is live and well-formed, confirming the endpoint is operational and ready to accept payments.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","json-response","no-api-key","post-method"],"categories":["data","api-infrastructure"],"synonyms":["lab results API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee","premium data access"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The endpoint /api/v1/lab/results/85 is not listed among the provider's advertised APIs — may be a test or unlisted resource","No example request body or response payload is documented anywhere","The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/85","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/85","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 there is no documentation, no OpenAPI schema, no example request/response, and the specific endpoint (/api/v1/lab/results/85) is not listed among the site's advertised APIs. The purpose and payload of this endpoint remain 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'/request':17,34 '0.02':16,33,84,133 '000':79 '0x8335':71 '20':78 '2913':72 '6':89 '85':48 'Base network API' 'USDC micropayment API' 'accept':55,214 'access':42,147 'advertis':95,164 'ai/ml':107 'among':162 'analysi':109 'analyt':106 'api':41,103,140,165 'avail':192 'base':9,26,66,80 'base-network' 'bodi':186 'broader':92 'call':4,21,102 'categori':166 'challeng':199 'charg':76 'classif':111 'confirm':206 'contract':70 'convers':128 'data':105 'decim':90 'document':187 'embed':112 'emphas':138 'endpoint':7,24,36,150,181,208 'equal':83 'estim':122 'exact':169 'exampl':189 'exchang':117 'explicit':154 'feed':116 'financ':113 'form':205 'gas':121 'generat':129 'geocod':126 'id':47 'infrastructur':124 'instant':146 'intern':180 'json':60 'json-response' 'key':141 'lab':5,22,44 'lab results API' 'land':160 'limit':144 'list':155 'live':201 'lowpaymentfee' 'lowpaymentfee.com':38,93 'maximum':75 'may':175 'network':67 'no-api-key' 'openapi':183 'oper':210 'page':161 'particular':195 'pay':2,19,100 'pay-per-cal':1,18,99 'pay-per-call' 'pay-per-request API' 'payload':171 'payment':52,61,215 'per':3,20,85,101,134 'platform':94,137 'post':56 'post-method' 'premium':40 'premium data access' 'price':115,131 'protocol':53 'provid':39 'quot':120 'rate':118,143 'readi':212 'request':57,86,135,185 'resourc':46,196 'respons':170,190 'result':6,23,45 'return':59 'schema':184 'sentiment':108 'settl':12,29,63 'site':158 'span':104 'specif':149 'suit':97 'summar':110 'test':178 'token':119 'unclear':173 'unit':81 'usdc':14,31,69,87 'usdc-settlement' 'use':68,88 'util':125 'valid':127 'via':10,27,49 'web3':114 'well':204 'well-form':203 'x402':11,28,51,198 'x402 paid endpoint' 'x402-payment'","prices":[{"id":"53203852-612a-4988-a9ad-e88738ff27ea","listingId":"01e3e1bd-82c5-40c7-a064-e280dae0ae64","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/85","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.647Z"}],"sources":[{"listingId":"01e3e1bd-82c5-40c7-a064-e280dae0ae64","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/85","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.647Z","lastSeenAt":"2026-04-23T02:02:21.435Z"}],"details":{"listingId":"01e3e1bd-82c5-40c7-a064-e280dae0ae64","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/85 \\\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 402 with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/85"},{"claim":"All listed APIs 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 on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/lab/results/85"}],"useCases":["Programmatic retrieval of lab result data with per-call USDC micropayments","Agent-driven data access without pre-registration or API keys","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that need keyless, pay-as-you-go data access","Low-volume consumers who want no subscription commitments"],"notFor":["Users needing well-documented, schema-specified endpoints","High-volume batch processing where per-call fees add up","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.779Z"},"updatedAt":"2026-04-23T02:02:21.435Z"}}