{"id":"d64a22d9-cc49-4dca-a0ac-71efd874d2f4","shortId":"WSYKuK","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/10`) 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 \"exact\" scheme to the specified wallet address, with a maximum timeout of 300 seconds.\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 with no API keys, no rate limits, and no minimum commitments. The specific endpoint probed here (`/api/v1/lab/results/10`) is not listed on the homepage catalog, so its exact response schema and data content are unclear — it may return laboratory or experimental result data, but no documentation or output schema was found.\n\nThe endpoint accepts POST requests and returns `application/json`. No OpenAPI spec, detailed documentation, or example responses were available from the crawl. The platform requires no authentication beyond the x402 payment header, and settlement occurs on the Base L2 network using USDC (contract `0x8335...2913`).","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","pay-per-request API","x402 API","USDC micropayment API","lowpaymentfee","Base network API","premium data endpoint"],"warnings":["No documentation or OpenAPI schema available for this specific endpoint","The /api/v1/lab/results/10 path is not listed among the provider's advertised APIs on the homepage","No example response or output schema is available — actual data content is unknown","Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/10","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/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation for this specific endpoint, no example request/response, and the endpoint path (/api/v1/lab/results/10) is not listed on the provider's homepage. The actual data returned is 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'/request':17,34 '0.02':16,33,85,152 '000':76 '0x8335':247 '20':75 '2913':248 '300':104 '402':61 '6':81 'Base network API' 'USDC micropayment API' 'accept':207 'access':42 'address':98 'advertis':110 'ai':122 'analysi':126 'analyt':121 'api':41,118,157 'application/json':212 'authent':230 'avail':222 'base':9,26,68,77,241 'base-network' 'beyond':231 'broader':107 'call':4,21,117 'catalog':178 'challeng':62 'classif':128 'commit':165 'content':186 'contract':246 'convers':145 'crawl':225 'data':46,120,185,196 'decim':82 'detail':216 'document':199,217 'embed':129 'endpoint':7,24,36,148,168,206 'equal':84 'estim':139 'exact':92,181 'exampl':219 'exchang':134 'experiment':194 'feed':133 'financ':130 'found':204 'gas':138 'generat':146 'geocod':143 'header':235 'homepag':177 'infrastructur':141 'json-response' 'key':158 'l2':242 'lab':5,22,44 'lab results API' 'laboratori':192 'learn':124 'limit':161 'list':150,174 'live':57 'lowpaymentfee' 'lowpaymentfee.com':38,108 'machin':123 'made':89 'maximum':101 'may':190 'minimum':164 'network':69,243 'no-api-key' 'occur':238 'openapi':214 'output':201 'path':48 'pay':2,19,115 'pay-per-cal':1,18,114 'pay-per-call' 'pay-per-request API' 'payment':53,65,87,234 'per':3,20,72,116,153 'platform':109,227 'post':208 'post-method' 'premium':40 'premium data endpoint' 'price':71,132 'probe':169 'protocol':54 'provid':39 'quot':137 'rate':135,160 'request':73,154,209 'requir':63,228 'resourc':47 'respons':182,220 'result':6,23,45,195 'return':59,191,211 'schema':183,202 'scheme':93 'second':105 'sentiment':125 'settl':12,29 'settlement':237 'span':119 'spec':215 'specif':167 'specifi':96 'suit':112 'summar':127 'timeout':102 'token':136 'unclear':188 'unit':78 'usd':86 'usdc':14,31,64,80,245 'usdc-settlement' 'use':50,244 'util':142 'valid':144 'via':10,27,90 'wallet':97 'web3':131 'x402':11,28,52,233 'x402 API' 'x402-payment'","prices":[{"id":"677912b4-76e6-4bba-9397-197ce7ca9429","listingId":"d64a22d9-cc49-4dca-a0ac-71efd874d2f4","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/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.138Z"}],"sources":[{"listingId":"d64a22d9-cc49-4dca-a0ac-71efd874d2f4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.138Z","lastSeenAt":"2026-04-22T05:32:13.237Z"}],"details":{"listingId":"d64a22d9-cc49-4dca-a0ac-71efd874d2f4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/10\n# Returns 402 with x402 challenge; include X-PAYMENT header with valid USDC payment on Base to access data.","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 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/10"},{"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 contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/lab/results/10"},{"claim":"The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving lab or experimental result data on a per-call payment basis","Integrating pay-per-use data endpoints into agent workflows without API key management","Programmatic access to premium data using crypto micropayments on Base"],"bestFor":["Agents or applications that need keyless, pay-per-call API access","Developers wanting to test x402 payment protocol integrations","Use cases requiring low-friction micropayment-gated data retrieval"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integration","High-volume batch processing where per-call pricing may add up","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.646Z"},"updatedAt":"2026-04-22T05:32:13.237Z"}}