{"id":"8d253979-7260-402a-867a-f64ff2dfa41e","shortId":"rjqw2W","kind":"x402","title":"Pay-per-call lab results endpoint on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call lab results endpoint on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at `/api/v1/lab/results/9` is part of the lowpaymentfee.com platform, which offers a broad suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are gated via the x402 protocol, settling payments in USDC on the Base network. The specific resource at `/lab/results/9` is labeled \"Premium API Access\" but its exact data payload is not documented — it appears to be a lab/results resource, possibly returning structured JSON results for a specific dataset or experiment identified by ID 9.\n\nPricing is $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). The platform advertises no API keys, no rate limits, no minimums, and instant access. Payment is made via the x402 exact-payment scheme: callers include an X-PAYMENT header with a signed USDC transfer on Base to the provider's address. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader lowpaymentfee.com platform lists 16+ endpoints across categories like sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more — all at the same $0.02/request price point. However, documentation for individual endpoint request/response schemas is not available, so the exact input parameters and output format for this specific endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","lab-results"],"categories":["data","api-marketplace"],"synonyms":["lab results API","premium API access","x402 paid endpoint","lowpaymentfee","micropayment API","USDC API","Base network API","pay-per-call API"],"warnings":["No documentation exists for the /api/v1/lab/results/9 endpoint — its purpose, input parameters, and response format are entirely unknown.","The endpoint path suggests a specific resource ID (9) which may be a demo or placeholder rather than a general-purpose API.","The /api, /pricing, and /README pages returned no useful content (only 'Connect wallet'), suggesting incomplete or wallet-gated documentation.","This endpoint is not listed among the 16 advertised APIs on the homepage, raising questions about its intended use."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/9","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/9","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 the specific /lab/results/9 endpoint — no input schema, no response schema, no description of what data it returns. The 'Premium API Access' label is generic and uninformative. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful 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'/lab/results/9':84 '/request':215 '0.02':12,28,122,136,214 '000':128 '16':193 '20':127 '6':134 '9':119 'Base network API' 'USDC API' 'accept':182 'access':89,150 'across':195 'address':179 'advertis':139 'ai/ml':57 'analysi':199 'analyt':56 'api':53,88,141 'appear':99 'application/json':187 'avail':227 'base':9,25,78,129,174 'base-network' 'broad':46 'broader':189 'call':4,20 'caller':161 'categori':196 'data':55,60,93 'dataset':113 'decim':135 'document':97,219 'embed':202 'endpoint':7,23,34,65,181,194,222,239 'estim':206 'exact':92,158,230 'exact-pay':157 'experi':115 'feed':204 'finance/web3':59 'format':235 'gas':205 'gate':67 'geocod':207 'header':167 'howev':218 'id':118 'identifi':116 'includ':162 'individu':221 'infer':58 'infrastructur':62 'input':231 'instant':149 'json':108 'json-response' 'key':142 'lab':5,21 'lab results API' 'lab-results' 'lab/results':103 'label':86 'like':197 'limit':145 'list':192 'lowpaymentfee' 'lowpaymentfee.com':41,190 'made':153 'maxamountrequir':125 'micropayment API' 'minimum':147 'network':79 'no-api-key' 'offer':44 'output':234 'paramet':232 'part':38 'pay':2,18,50 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':49 'payload':94 'payment':73,151,159,166 'per':3,13,19,29,51,123 'platform':42,138,191 'point':217 'possibl':105 'post':183 'premium':87 'premium API access' 'price':120,203,216 'protocol':71 'provid':177 'rate':144 'remain':240 'request':14,30,52,124,184 'request/response':223 'resourc':82,104 'result':6,22,109 'return':106,186 'schema':224 'scheme':160 'sentiment':198 'settl':72 'sign':170 'span':54 'specif':81,112,238 'structur':107 'suit':47 'summar':201 'text':200 'transfer':172 'unit':130 'unknown':241 'usdc':16,32,75,132,171 'usdc-settlement' 'util':63 'via':10,26,68,154 'x':165 'x-payment':164 'x402':11,27,70,156 'x402 paid endpoint' 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<signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform charges $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/9"},{"claim":"The platform offers 16+ endpoints across data analytics, AI/ML, finance, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/9"}],"useCases":["Retrieving lab or experiment results behind a micropayment wall","Demonstrating x402 payment protocol integration for agent-to-agent commerce","Accessing structured data without traditional API key registration"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can autonomously pay for data per request","Users who want instant access without signup or API key management"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Bulk data retrieval where per-request micropayments become costly","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.427Z"},"updatedAt":"2026-04-22T01:02:20.831Z"}}