{"id":"34918ebc-baf6-4a0e-87fd-3417723bedd0","shortId":"ckhu9g","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":"lowpaymentfee.com is a pay-per-request API platform that gates access behind x402 micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/lab/results/44` is listed under \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, i.e. 20000 / 10^6 = $0.02). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four categories: 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 uniformly priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/lab/results/44`) appears to be a specific lab result resource. However, the crawled documentation does not describe what \"lab results\" contain or what the expected request/response payloads look like. The endpoint accepts POST requests and returns `application/json`. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","post-method"],"categories":["data","api-infrastructure"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","lab results API","premium data endpoint"],"warnings":["No documentation found for the specific '/api/v1/lab/results/44' endpoint — its purpose and response format are unknown.","This endpoint does not appear in the site's listed API catalog, which raises questions about its intended use.","No OpenAPI spec, request schema, or response schema available.","No examples of request or response payloads could be found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/44","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/44","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 '/api/v1/lab/results/44' actually returns, no request/response schema, and no examples. The 'lab results' concept is not explained anywhere in the crawled material, making this effectively a stub 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'/request':13,28 '0.02':12,27,67,82,150 '000':73 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':197 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':200 '10':80 '20':72 '20000':79 '6':81 'Base network API' 'USDC pay-per-call' 'accept':186 'access':7,22,42,62 'across':108 'address':196 'ai':118 'analysi':122 'analyt':112 'api':6,21,38,61,84 'appear':157 'application/json':191 'attach':95 'base':9,24,51,74,202 'behind':43 'broader':104 'call':4,19,69 'caller':93 'categori':110 'classif':125 'commit':90 'contain':175 'convers':142 'cost':64 'crawl':167 'data':111,115 'describ':171 'document':168 'embed':126 'endpoint':55,107,145,155,185 'estim':136 'exchang':131 'expect':179 'export':116 'feed':130 'financ':127 'four':109 'gas':135 'gate':41 'generat':143 'geocod':140 'header':99 'howev':165 'i.e':78 'infrastructur':138 'insight':117 'json-api' 'key':85 'lab':162,173 'lab results API' 'learn':120 'like':183 'limit':87 'list':58 'look':182 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'made':194 'maxamountrequir':70 'metric':113 'micropay':45 'micropayment API' 'network':52 'no-api-key' 'offer':106 'particular':154 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payload':181 'payment':98,192 'per':3,18,36,68,151 'platform':39,105 'post':187 'post-method' 'premium':5,20,60 'premium data endpoint' 'price':129,148 'quot':134 'rate':86,132 'report':114 'request':37,102,152,188 'request/response':180 'requir':92 'resourc':164 'result':163,174 'return':190 'sentiment':121 'settl':46 'simpli':94 'specif':54,161 'summar':124 'text':123 'token':133 'uniform':147 'unit':75 'upfront':89 'usdc':15,30,48,77,199 'usdc-base' 'use':198 'util':139 'valid':141 'via':10,25 'web3':128 'x402':11,26,44,97 'x402 API' 'x402-payment'","prices":[{"id":"d8c679b4-8532-42c9-acba-6116f9d92784","listingId":"34918ebc-baf6-4a0e-87fd-3417723bedd0","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.488Z"}],"sources":[{"listingId":"34918ebc-baf6-4a0e-87fd-3417723bedd0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.488Z","lastSeenAt":"2026-04-23T02:02:21.208Z"}],"details":{"listingId":"34918ebc-baf6-4a0e-87fd-3417723bedd0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/44 \\\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 challenge requiring USDC payment on Base with maxAmountRequired of 20000 base units ($0.02).","source_url":"https://lowpaymentfee.com/api/v1/lab/results/44"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, rate limits, or commitments.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.","source_url":"https://lowpaymentfee.com/api/v1/lab/results/44"}],"useCases":["Fetching specific lab result data via a single paid API call","Programmatic access to premium data without managing API keys or subscriptions","Agent-driven workflows that need on-demand data retrieval with crypto micropayments"],"bestFor":["Developers wanting zero-friction, keyless API access paid in USDC","AI agents that can settle x402 payments autonomously on Base","Use cases requiring low-cost per-call pricing without rate limits"],"notFor":["Users who need free or ad-supported API access","High-volume batch processing where per-call pricing becomes expensive","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.041Z"},"updatedAt":"2026-04-23T02:02:21.208Z"}}