{"id":"bad466f4-56ec-4fdc-bca4-0071968c3f61","shortId":"mKfDMK","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 x402-enabled endpoint at lowpaymentfee.com provides access to a \"lab results\" resource at the path `/api/v1/lab/results/90`. It is part of a broader platform offering dozens of pay-per-call 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.\n\nThe specific endpoint `/api/v1/lab/results/90` accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers attach an `X-PAYMENT` header containing a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals). The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base mainnet using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. No API keys, rate limits, or subscriptions are required — access is purely pay-per-use.\n\nThe platform advertises itself with the tagline \"No API keys, No rate limits, Instant access\" on the Base network. However, the exact nature of the data returned by the `/api/v1/lab/results/90` endpoint is unclear — the listing title is simply \"Premium API Access\" and no detailed documentation, request schema, or response schema is available. The \"90\" in the path may refer to a specific result ID or resource identifier, but this is not documented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","json-response","no-api-key","post-method"],"categories":["data","api-infrastructure"],"synonyms":["lab results API","pay-per-request API","x402 endpoint","USDC micropayment API","lowpaymentfee","Base network API","premium data access"],"warnings":["No documentation available for the specific /api/v1/lab/results/90 endpoint — its purpose and response format are unknown","This endpoint path does not appear in the provider's own homepage API listing, raising questions about whether it is a standard offering","No OpenAPI spec, no request schema, and no response schema were found","Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/90","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/90","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 on what this specific endpoint returns, no request/response schema, no examples, and the crawled pages beyond the homepage are empty wallet-connect stubs. The purpose of '/api/v1/lab/results/90' is essentially 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'/request':17,34 '0.02':16,33,81,129 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':141 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':149 '20':124 '6':133 '90':219 'Base network API' 'USDC micropayment API' 'accept':96 'access':43,159,180,206 'address':140 'advertis':168 'ai/ml':71 'analyt':70 'api':67,151,174,205 'application/json':101 'attach':110 'avail':217 'base':9,26,90,126,143,183 'base-network' 'broader':58 'call':4,21,66 'caller':109 'contain':116 'contract':148 'data':69,74,191 'decim':134 'detail':209 'document':210,237 'dozen':61 'enabl':38 'endpoint':7,24,39,94,196 'exact':187 'finance/web3':73 'handl':104 'header':115 'howev':185 'i.e':128 'id':229 'identifi':232 'infer':72 'infrastructur':76 'instant':179 'json-response' 'key':152,175 'lab':5,22,46 'lab results API' 'limit':154,178 'list':200 'lowpaymentfee' 'lowpaymentfee.com':41 'mainnet':144 'may':223 'natur':188 'network':91,184 'no-api-key' 'offer':60 'part':55 'path':51,222 'pay':2,19,64,163 'pay-per-cal':1,18,63 'pay-per-call' 'pay-per-request API' 'pay-per-us':162 'payment':102,114,120,136 'per':3,20,65,82,164 'platform':59,167 'post':97 'post-method' 'premium':204 'premium data access' 'price':79 'protocol':108 'provid':42 'pure':161 'rate':153,177 'refer':224 'request':83,98,211 'requir':158 'resourc':48,231 'respons':214 'result':6,23,47,228 'return':100,192 'schema':212,215 'sent':138 'settl':12,29,85 'sign':118 'simpli':203 'sinc':130 'span':68 'specif':93,227 'subscript':156 'taglin':172 'titl':201 'unclear':198 'unit':127 'usdc':14,31,87,119,131,147 'usdc-settlement' 'use':132,145,165 'util':77 'via':10,27,105 'x':113 'x-payment':112 'x402':11,28,37,107 'x402 endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"c6ce9d05-ab32-4eb5-83d3-6c722476e08e","listingId":"bad466f4-56ec-4fdc-bca4-0071968c3f61","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/90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.983Z"}],"sources":[{"listingId":"bad466f4-56ec-4fdc-bca4-0071968c3f61","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/90","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.983Z","lastSeenAt":"2026-04-22T01:02:20.951Z"}],"details":{"listingId":"bad466f4-56ec-4fdc-bca4-0071968c3f61","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/90 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/90"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/lab/results/90"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving lab or analytical results on a per-call payment basis","Integrating pay-per-use data endpoints into agent workflows without managing API keys","Programmatic access to structured results settled via on-chain USDC micropayments"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer on-chain micropayments over subscription billing"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.249Z"},"updatedAt":"2026-04-22T01:02:20.951Z"}}