{"id":"1215a882-d7f1-4baa-8d15-f3e058f61d10","shortId":"R5bPJS","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 specific lab result resource (ID 93) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with an exact-scheme x402 challenge.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints on the platform are advertised at $0.02 per request with no API keys, no rate limits, and no commitments required.\n\nThe specific resource at `/api/v1/lab/results/93` is labeled \"Premium API Access\" in the x402 challenge. The maxAmountRequired is 20000 base units of USDC (6 decimals), which equals $0.02. The challenge specifies a timeout of 300 seconds. No OpenAPI schema, detailed documentation, or example responses were found for this specific endpoint, so the exact shape of the returned data is unknown. The broader site's /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional documentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","json-response","lab-results"],"categories":["data","api-infrastructure"],"synonyms":["lab results API","x402 paid endpoint","USDC micropayment API","lowpaymentfee","pay-per-request API","Base network API","premium data access"],"warnings":["No documentation available for this specific endpoint — the /api, /pricing, and /README pages all return only a wallet-connect prompt","The exact content and schema of the response body are unknown","The meaning of 'lab results' and what ID 93 represents is not documented anywhere in the crawl material","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/93","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/93","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 confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, and the nature of \"lab results\" for ID 93 is entirely opaque. The broader site's docs pages are empty. This is effectively a stub 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'/api/v1/lab/results/93':152 '/pricing':212 '/readme':214 '/request':17,34 '0.02':16,33,134,174 '0x8335':70 '20000':165 '2913':71 '300':181 '6':170 '93':48 'Base network API' 'USDC micropayment API' 'accept':54 'access':40,157 'addit':225 'advertis':132 'ai':101 'analysi':105 'analyt':100 'api':97,139,156 'base':9,26,65,166 'base-network' 'behind':49 'broader':85,208 'call':4,21,96 'challeng':78,161,176 'classif':107 'commit':146 'connect':220 'contract':69 'convers':124 'data':99,204 'decim':171 'detail':186 'document':187,226 'embed':108 'endpoint':7,24,36,80,127,196 'equal':173 'estim':118 'exact':75,199 'exact-schem':74 'exampl':189 'exchang':113 'feed':112 'financ':109 'found':192 'gas':117 'generat':125 'geocod':122 'id':47 'infrastructur':120 'json':59 'json-response' 'key':140 'lab':5,22,44 'lab results API' 'lab-results' 'label':154 'learn':103 'limit':143 'lowpaymentfee' 'lowpaymentfee.com':38,87 'machin':102 'maxamountrequir':163 'network':66 'offer':89 'openapi':184 'page':215 'part':82 'pay':2,19,94 'pay-per-cal':1,18,93 'pay-per-call' 'pay-per-request API' 'payment':60 'paywal':52 'per':3,20,95,135 'platform':86,130 'post':55 'premium':155 'premium data access' 'price':111 'prompt':222 'provid':39 'quot':116 'rate':114,142 'request':56,136 'requir':147 'resourc':46,150 'respons':190 'result':6,23,45 'return':58,203,217 'schema':185 'scheme':76 'second':182 'sentiment':104 'settl':12,29,62 'shape':200 'site':209 'span':98 'specif':43,149,195 'specifi':177 'summar':106 'timeout':179 'token':115 'unit':167 'unknown':206 'usdc':14,31,68,169 'usdc-settlement' 'use':67 'util':121 'valid':123 'varieti':91 'via':10,27 'wallet':221 'web3':110 'x402':11,28,51,77,160 'x402 paid endpoint' 'x402-payment'","prices":[{"id":"f01c9be0-42d3-4bd0-926d-e0f1aa2d1950","listingId":"1215a882-d7f1-4baa-8d15-f3e058f61d10","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.174Z"}],"sources":[{"listingId":"1215a882-d7f1-4baa-8d15-f3e058f61d10","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.174Z","lastSeenAt":"2026-04-22T01:02:21.428Z"}],"details":{"listingId":"1215a882-d7f1-4baa-8d15-f3e058f61d10","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/93 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","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/93"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/93"}],"useCases":["Retrieving lab result data (ID 93) via a single paid API call","Demonstrating x402 payment protocol integration for agent-to-agent commerce","Accessing pay-per-call data without API key registration"],"bestFor":["Agents or developers experimenting with x402 payment flows","Accessing data behind micropayment walls without subscriptions","Low-friction, keyless API consumption on Base"],"notFor":["Users needing detailed documentation or schema guarantees before integration","Bulk data retrieval where per-call pricing is inefficient","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.003Z"},"updatedAt":"2026-04-22T01:02:21.428Z"}}