{"id":"99f6430a-4711-4484-8db3-8bef223f8e0b","shortId":"ZMZKyA","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 \"lab results\" resource (ID 7) 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/7` is listed under the title \"Premium API Access\" but its exact response payload is not documented beyond the MIME type `application/json`. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The payment scheme is \"exact\" with a 300-second timeout.\n\nThe provider's landing page advertises a uniform $0.02/request pricing model across all endpoints, with no minimums or commitments. However, no OpenAPI schema, detailed documentation, or example responses are available for this specific endpoint, so the exact structure and content of the returned lab results data is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","lab-results"],"categories":["data"],"synonyms":["lab results API","pay-per-call API","x402 endpoint","USDC micropayment API","lowpaymentfee","premium API access","Base network API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The exact nature of 'lab results' data is undocumented — unclear what the response contains","No example requests or responses are provided anywhere on the site","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/7","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/7","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 OpenAPI schema, no documentation of request/response formats, and the purpose of 'lab results/7' is entirely opaque. The endpoint is effectively a stub listing with minimal useful information for 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'/request':17,34,187 '0.02':16,33,77,153,186 '000':148 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':165 '20':147 '300':175 '6':158 '7':47 'Base network API' 'USDC micropayment API' 'accept':140 'access':40,118 'across':190 'address':164 'advertis':183 'ai/ml':67 'analyt':66 'api':63,89,117 'application/json':131 'attach':99 'avail':208 'base':9,26,86,149,167 'base-network' 'behind':48 'beyond':127 'broad':56 'call':4,21,161 'caller':97 'challeng':134 'commit':197 'confirm':135 'content':218 'data':65,70,224 'decim':159 'detail':202 'document':126,203 'endpoint':7,24,36,109,137,192,212 'exact':121,172,215 'exampl':205 'finance/web3':69 'header':103 'howev':198 'id':46 'infer':68 'infrastructur':72 'json-response' 'key':90 'lab':5,22,43,222 'lab results API' 'lab-results' 'land':181 'limit':92 'list':112 'live':139 'lowpaymentfee' 'lowpaymentfee.com':38 'mime':129 'minimum':195 'model':189 'network':87 'no-api-key' 'openapi':200 'oper':54 'page':182 'paid':162 'pay':2,19,60 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':59 'payload':123 'payment':102,169 'paywal':51 'per':3,20,61,78,160 'post':141 'premium':116 'premium API access' 'price':75,188 'provid':39,53,179 'rate':91 'request':62,79,106,142 'requir':96,144 'resourc':45 'respons':122,206 'result':6,23,44,223 'return':221 'schema':201 'scheme':170 'second':176 'settl':12,29,81 'simpli':98 'sinc':155 'span':64 'specif':108,211 'structur':216 'subscript':94 'suit':57 'timeout':177 'titl':115 'type':130 'uniform':185 'unit':150 'unknown':226 'usd':154 'usdc':14,31,83,152,156 'usdc-settlement' 'use':157 'util':73 'via':10,27 'x402':11,28,50,101,133 'x402 endpoint' 'x402-payment'","prices":[{"id":"a5286bc9-9d3b-4d02-bba9-8aa4164f257c","listingId":"99f6430a-4711-4484-8db3-8bef223f8e0b","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/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.382Z"}],"sources":[{"listingId":"99f6430a-4711-4484-8db3-8bef223f8e0b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.382Z","lastSeenAt":"2026-04-23T03:32:27.321Z"}],"details":{"listingId":"99f6430a-4711-4484-8db3-8bef223f8e0b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/7 \\\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 requiring USDC payment of 20,000 base units (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/7"},{"claim":"All APIs are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/lab/results/7"}],"useCases":["Retrieving lab results data (ID 7) on demand with per-request USDC micropayments","Integrating pay-as-you-go data access into agent workflows without managing API keys","Programmatic access to premium data behind a crypto paywall"],"bestFor":["Agents or applications that need keyless, pay-per-call data access","Developers experimenting with x402 payment protocol integrations","Use cases requiring low-friction micropayment-gated API access on Base"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume batch retrieval where per-request pricing becomes costly","Anyone who cannot settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.255Z"},"updatedAt":"2026-04-23T03:32:27.321Z"}}