{"id":"888387fd-c210-4e71-b169-9e931f1bba68","shortId":"P5uWBK","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 data (resource path `/api/v1/lab/results/3`) using the x402 payment protocol. It is live and returns a 402 challenge requiring USDC payment on the Base network. The price per request is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. Payment is made via the x402 \"exact\" scheme to the specified wallet address, with no API keys or rate limits required.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request. However, this specific listing covers only the `/api/v1/lab/results/3` endpoint, which is described generically as \"Premium API Access\" without further documentation on what \"lab results\" data it returns.\n\nThe endpoint accepts HTTP POST requests and returns `application/json` responses. No OpenAPI schema, request body schema, or response examples are provided by the site, so the exact input parameters and output format are unknown. The x402 challenge specifies a maximum timeout of 300 seconds and uses USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","json-response","http-post","no-api-key"],"categories":["data"],"synonyms":["lab results API","premium data endpoint","x402 API","USDC micropayment API","lowpaymentfee","pay-per-request API","Base network API"],"warnings":["No documentation exists for what data /api/v1/lab/results/3 actually returns","No request body schema or response schema available","The endpoint name 'lab results' is unexplained — unclear if this is test/demo data or a real service","No OpenAPI spec, no README content, and ancillary pages only show 'Connect wallet'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/3","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/3","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 challenge, but there is no documentation on what 'lab results' data is returned, no request/response schema, and no examples. The description is entirely generic ('Premium API Access'). The crawled pages provide no additional detail about this specific 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'/request':17,34 '0.02':16,33,85,154 '000':76 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':232 '20':75 '300':226 '402':61 '6':81 'Base network API' 'USDC micropayment API' 'accept':186 'access':42,173 'address':99 'advertis':112 'ai':124 'analysi':128 'analyt':123 'api':41,102,120,172 'application/json':192 'base':9,26,68,77,234 'bodi':198 'broader':109 'call':4,21,119 'challeng':62,220 'classif':130 'contract':231 'convers':147 'cover':161 'data':46,122,181 'decim':82 'describ':168 'document':176 'embed':131 'endpoint':7,24,36,150,165,185 'equal':84 'estim':141 'exact':93,210 'exampl':202 'exchang':136 'feed':135 'financ':132 'format':215 'gas':140 'generat':148 'generic':169 'geocod':145 'howev':157 'http':187 'http-post' 'infrastructur':143 'input':211 'json-response' 'key':103 'lab':5,22,44,179 'lab results API' 'learn':126 'limit':106 'list':152,160 'live':57 'lowpaymentfee' 'lowpaymentfee.com':38,110 'machin':125 'made':89 'maximum':223 'network':69 'no-api-key' 'openapi':195 'output':214 'paramet':212 'path':48 'pay':2,19,117 'pay-per-cal':1,18,116 'pay-per-call' 'pay-per-request API' 'payment':53,65,87 'per':3,20,72,118,155 'platform':111 'post':188 'premium':40,171 'premium data endpoint' 'price':71,134 'protocol':54 'provid':39,204 'quot':139 'rate':105,137 'request':73,156,189,197 'requir':63,107 'resourc':47 'respons':193,201 'result':6,23,45,180 'return':59,183,191 'schema':196,199 'scheme':94 'second':227 'sentiment':127 'settl':12,29 'site':207 'span':121 'specif':159 'specifi':97,221 'suit':114 'summar':129 'timeout':224 'token':138 'unit':78 'unknown':217 'usd':86 'usdc':14,31,64,80,230 'usdc-base' 'use':50,229 'util':144 'valid':146 'via':10,27,90 'wallet':98 'web3':133 'without':174 'x402':11,28,52,92,219 'x402 API' 'x402-payment'","prices":[{"id":"afb4e422-11a0-440a-ba4b-6029fecc7d56","listingId":"888387fd-c210-4e71-b169-9e931f1bba68","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.066Z"}],"sources":[{"listingId":"888387fd-c210-4e71-b169-9e931f1bba68","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.066Z","lastSeenAt":"2026-04-23T05:02:13.484Z"}],"details":{"listingId":"888387fd-c210-4e71-b169-9e931f1bba68","quickStartSnippet":"# 1. Probe the endpoint to get the 402 challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/lab/results/3\n# Returns 402 with x402 payment challenge\n# 2. Construct X-PAYMENT header with signed USDC payment (20000 base units = $0.02)\n#    and re-send the POST request with the header attached.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/3"},{"claim":"All endpoints on the platform 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 network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/3"}],"useCases":["Retrieving lab results data on a per-call payment basis without needing an API key","Integrating pay-per-use data access into autonomous agent workflows","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call data access on Base","Low-volume or sporadic API consumers who prefer no subscriptions"],"notFor":["Users who need detailed documentation or well-defined schemas before integration","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.771Z"},"updatedAt":"2026-04-23T05:02:13.484Z"}}