{"id":"b6f74719-9292-4a12-995a-f7d390aa74e2","shortId":"sB2W4C","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 access to a \"lab results\" resource (ID 98) behind an x402 paywall. The provider operates a broad suite of pay-per-request 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. No API keys, accounts, or rate limits are required; callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/lab/results/98` is listed under the title \"Premium API Access\" but its exact data payload is not documented on the provider's site. The x402 challenge confirms it is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base mainnet using the exact-amount scheme.\n\nBecause the provider's documentation pages (/api, /pricing, /README) all resolve to a minimal \"Connect wallet\" page with no further detail, the actual response schema and the nature of the \"lab results\" data are unknown. The landing page lists many other endpoints in categories like sentiment analysis, text summarization, geocoding, and crypto gas estimates, all at the same $0.02 price point, but no OpenAPI spec or detailed docs were found.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["data","api-marketplace"],"synonyms":["lab results API","lowpaymentfee","x402 API","USDC micropayment API","pay-per-call API","Base network API","premium data endpoint"],"warnings":["The specific data returned by /api/v1/lab/results/98 is not documented anywhere on the provider's site.","No OpenAPI spec, request schema, or response schema is available.","Documentation pages (/api, /pricing, /README) all resolve to a minimal 'Connect wallet' stub with no useful content.","This endpoint does not appear in the provider's own landing-page catalog of available APIs, raising questions about its status."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/98","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/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but the endpoint's actual purpose, request parameters, and response schema are entirely undocumented. Documentation pages return only 'Connect wallet' with no content. The 'lab results' label is opaque and 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'/api/v1/lab/results/98':110 '/pricing':184 '/readme':185 '/request':17,34 '0.02':16,33,77,153,235 '000':148 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':167 '20':147 '6':158 '98':47 'Base network API' 'USDC micropayment API' 'accept':139 'access':40,118 'account':91 'actual':199 'address':166 'ai/ml':67 'amount':175 'analysi':223 'analyt':66 'api':63,89,117 'attach':99 'base':9,26,86,149,169 'base-network' 'behind':48 'broad':56 'call':4,21,161 'caller':97 'categori':220 'challeng':134 'charg':143 'confirm':135 'connect':191 'crypto':228 'data':65,70,122,209 'decim':159 'detail':197,243 'doc':244 'document':126,181 'endpoint':7,24,36,109,218 'estim':230 'exact':121,174 'exact-amount':173 'finance/web3':69 'found':246 'gas':229 'geocod':226 'header':103 'id':46 'infer':68 'infrastructur':72 'json-response' 'key':90 'lab':5,22,43,207 'lab results API' 'land':213 'like':221 'limit':94 'list':112,215 'live':138 'lowpaymentfee' 'lowpaymentfee.com':38 'mainnet':170 'mani':216 'maximum':145 'minim':190 'natur':204 'network':87 'no-api-key' 'openapi':240 'oper':54 'page':182,193,214 'pay':2,19,60 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':59 'payload':123 'payment':102,162 'paywal':51 'per':3,20,61,78,160 'point':237 'post':140 'post-method' 'premium':116 'premium data endpoint' 'price':75,236 'provid':39,53,129,179 'rate':93 'request':62,79,106,141 'requir':96 'resolv':187 'resourc':45 'respons':200 'result':6,23,44,208 'schema':201 'scheme':176 'sent':164 'sentiment':222 'settl':12,29,81 'simpli':98 'sinc':155 'site':131 'span':64 'spec':241 'specif':108 'suit':57 'summar':225 'text':224 'titl':115 'unit':150 'unknown':211 'usd':154 'usdc':14,31,83,152,156 'usdc-settlement' 'use':157,171 'util':73 'via':10,27 'wallet':192 'x402':11,28,50,101,133 'x402 API' 'x402-payment'","prices":[{"id":"ecc977ad-5b0c-4a06-a1bb-beac3698db6a","listingId":"b6f74719-9292-4a12-995a-f7d390aa74e2","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/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.859Z"}],"sources":[{"listingId":"b6f74719-9292-4a12-995a-f7d390aa74e2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/98","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.859Z","lastSeenAt":"2026-04-22T01:02:20.799Z"}],"details":{"listingId":"b6f74719-9292-4a12-995a-f7d390aa74e2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/98 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/98"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/lab/results/98"}],"useCases":["Retrieving lab result data (ID 98) on demand with per-call USDC micropayments","Integrating pay-per-use data access into autonomous agent workflows","Accessing premium content without managing API keys or subscriptions"],"bestFor":["Agents or applications that need keyless, pay-per-call data access","Developers experimenting with x402 payment protocol on Base","Workflows requiring low-friction micropayment-gated API calls"],"notFor":["Users who need detailed documentation or a well-defined response schema before integrating","High-volume batch consumers who would benefit from subscription pricing","Anyone needing non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.488Z"},"updatedAt":"2026-04-22T01:02:20.799Z"}}