{"id":"7b2c1345-8222-48ff-a29a-38fca9cb64a2","shortId":"f8HPgt","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/79` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network at $0.02 per call with no API keys, no rate limits, and no subscriptions required.\n\nThe specific resource `/api/v1/lab/results/79` is listed under the generic title \"Premium API Access.\" Its exact data payload is unclear — the path suggests retrieving results for a specific lab or experiment (ID 79), but no documentation, OpenAPI spec, or response schema was found. The endpoint is confirmed live: it returns a proper x402 challenge (HTTP 402) requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. Payment is made via the `exact` scheme to address `0x1A2B...85F3`, with a 300-second timeout.\n\nBecause the crawled site pages beyond the homepage returned only \"Connect wallet\" with no additional documentation, the actual response format and data content of this endpoint remain unknown. Prospective callers should be aware that the endpoint's purpose is not well-documented and may require exploratory calls to determine usefulness.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","no-rate-limit"],"categories":["data","api-marketplace"],"synonyms":["lab results API","lowpaymentfee","x402 API","micropayment API","Base USDC API","pay-per-call endpoint","premium API access"],"warnings":["No documentation found for /api/v1/lab/results/79 — purpose and response format are unknown","No OpenAPI or output schema available; response content must be discovered empirically","Site pages beyond homepage return only 'Connect wallet' with no useful content","The path '/lab/results/79' does not match any of the documented API categories on the homepage"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/79","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/79","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, confirming pricing and payment details. However, there is no OpenAPI spec, no response schema, no documentation beyond a generic title, and no example responses. The actual data returned by this endpoint is entirely unknown, making it effectively a stub 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'0.02':12,28,79,158 '000':152 '0x1a2b':170 '20':151 '300':174 '402':147 '79':124 '85f3':171 'Base USDC API' 'access':105 'actual':194 'addit':191 'address':169 'ai/ml':57 'analyt':56 'api':53,84,104 'awar':209 'base':9,25,76,153,160 'beyond':182 'broad':46 'call':4,20,81,224 'caller':206 'catalog':47 'challeng':145 'confirm':138 'connect':187 'content':199 'crawl':179 'crypto':60 'data':55,108,198 'determin':226 'document':127,192,219 'endpoint':7,23,34,65,136,202,212 'exact':107,166 'experi':122 'exploratori':223 'financ':59 'format':196 'found':134 'generic':101 'homepag':184 'http':146 'i.e':157 'id':123 'infer':58 'json-response' 'key':85 'lab':5,21,120 'lab results API' 'limit':88 'list':98 'live':139 'lowpaymentfee' 'lowpaymentfee.com':41 'made':163 'may':221 'micropayment API' 'network':77 'no-api-key' 'no-rate-limit' 'offer':44 'openapi':128 'page':181 'part':38 'path':113 'pay':2,18,50 'pay-per-cal':1,17 'pay-per-call endpoint' 'pay-per-request':49 'payload':109 'payment':69,161 'per':3,13,19,29,51,80 'platform':42 'premium':103 'premium API access' 'proper':143 'prospect':205 'protocol':70 'purpos':214 'rate':87 'remain':203 'request':14,30,52,148 'requir':92,222 'resourc':95 'respons':131,195 'result':6,22,116 'retriev':115 'return':141,185 'schema':132 'scheme':167 'second':175 'servic':63 'settl':71 'site':180 'span':54 'spec':129 'specif':94,119 'subscript':91 'suggest':114 'timeout':176 'titl':102 'unclear':111 'unit':154 'unknown':204 'usdc':16,32,73,156 'usdc-base' 'use':66,227 'util':62 'via':10,26,164 'wallet':188 'well':218 'well-docu':217 'x402':11,27,68,144 'x402 API' 'x402-payment'","prices":[{"id":"2960c2af-be51-4ef8-8f32-57dd8d7162f7","listingId":"7b2c1345-8222-48ff-a29a-38fca9cb64a2","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/79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.742Z"}],"sources":[{"listingId":"7b2c1345-8222-48ff-a29a-38fca9cb64a2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/79","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.742Z","lastSeenAt":"2026-04-22T01:02:20.616Z"}],"details":{"listingId":"7b2c1345-8222-48ff-a29a-38fca9cb64a2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/79 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/79"},{"claim":"All APIs on the platform cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/lab/results/79"}],"useCases":["Retrieving lab or experiment results (ID 79) via a single paid HTTP call","Exploring low-cost pay-per-request API patterns on Base network","Integrating x402 micropayment flows into agent or automation pipelines"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need keyless, pay-per-call API access on Base","Users who want to avoid subscriptions and pay only per request"],"notFor":["Anyone needing well-documented, schema-specified API responses","High-volume batch consumers who would benefit from subscription pricing","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.629Z"},"updatedAt":"2026-04-22T01:02:20.616Z"}}