{"id":"b0e21f05-c913-44ef-a55e-2e8ed7555722","shortId":"JekkQy","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides pay-per-request API access via the x402 protocol, settling payments in USDC on the Base network. The specific resource `/api/v1/lab/results/91` is listed under \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or subscriptions are required — each request is individually paid for using an X-PAYMENT header.\n\nThe broader lowpaymentfee.com platform offers a suite of endpoints spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced uniformly at $0.02 per request.\n\nThe specific endpoint `/api/v1/lab/results/91` does not have detailed documentation beyond its title \"Premium API Access.\" It accepts POST requests and returns `application/json`. The exact schema of the request body and response payload is not documented in the crawled material, so the precise data returned is unknown. The x402 challenge is live and well-formed, confirming the endpoint is operational.","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","premium data API","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API"],"warnings":["No documentation exists for the specific endpoint /api/v1/lab/results/91 — the purpose and data returned are unknown.","No request body schema or response schema is available; integration requires trial-and-error.","The /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content.","The endpoint path 'lab/results/91' suggests a fixed resource ID; it is unclear if this is parameterized or static."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/91","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific endpoint lacks any documentation of request body schema, response schema, or what \"lab results/91\" actually returns. No OpenAPI spec, no examples, and crawled pages beyond the homepage are empty wallet-connect 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'/request':13,28 '0.02':12,27,66,148 '000':70 '20':69 '6':76 'Base network API' 'USDC micropayment API' 'accept':167 'access':7,22,41,63,165 'ai':116 'analysi':120 'analyt':110 'api':6,21,40,62,79,164 'application/json':172 'base':9,24,52,71 'base-network' 'beyond':160 'bodi':179 'broader':100 'call':4,19,68 'challeng':199 'classif':123 'confirm':206 'convers':140 'cost':65 'crawl':188 'data':109,113,193 'decim':77 'detail':158 'document':159,185 'embed':124 'endpoint':32,107,143,153,208 'estim':134 'exact':174 'exchang':129 'export':114 'feed':128 'financ':125 'form':205 'gas':133 'generat':141 'geocod':138 'header':98 'individu':90 'infrastructur':136 'insight':115 'json-response' 'key':80 'lab results API' 'learn':118 'limit':82 'list':59 'live':201 'lowpaymentfee' 'lowpaymentfee.com':34,101 'machin':117 'materi':189 'metric':111 'network':53 'no-api-key' 'offer':103 'oper':210 'paid':91 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payload':182 'payment':47,97 'per':3,18,38,67,149 'platform':102 'post':168 'post-method' 'precis':192 'premium':5,20,61,163 'premium data API' 'price':127,145 'protocol':45 'provid':35 'quot':132 'rate':81,130 'report':112 'request':39,88,150,169,178 'requir':86 'resourc':56 'respons':181 'return':171,194 'schema':175 'sentiment':119 'settl':46 'span':108 'specif':55,152 'subscript':84 'suit':105 'summar':122 'text':121 'titl':162 'token':131 'uniform':146 'unit':72 'unknown':196 'usdc':15,30,49,74 'usdc-settlement' 'use':93 'util':137 'valid':139 'via':10,25,42 'web3':126 'well':204 'well-form':203 'x':96 'x-payment':95 'x402':11,26,44,198 'x402 API' 'x402-payment'","prices":[{"id":"92b8a9ba-a4ae-4b60-a824-c27c54ebcc03","listingId":"b0e21f05-c913-44ef-a55e-2e8ed7555722","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.780Z"}],"sources":[{"listingId":"b0e21f05-c913-44ef-a55e-2e8ed7555722","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/91","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.780Z","lastSeenAt":"2026-04-22T01:02:20.700Z"}],"details":{"listingId":"b0e21f05-c913-44ef-a55e-2e8ed7555722","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/91 \\\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 in USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/91"},{"claim":"All endpoints on the platform 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":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium lab results data on a per-request basis without subscriptions","Agent-driven data retrieval with automatic USDC micropayments on Base","Integrating pay-as-you-go API calls into automated workflows"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over API key management"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.624Z"},"updatedAt":"2026-04-22T01:02:20.700Z"}}