{"id":"522ea88a-ab91-4e11-8a7d-ffdc01d7419b","shortId":"SK8AxU","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 using the x402 protocol, settling payments in USDC on the Base network. The specific resource `/api/v1/lab/results/81` is listed under \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\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 at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific `/api/v1/lab/results/81` endpoint's purpose is not clearly documented — it does not appear in the main landing page's API catalog, and the \"lab/results\" path suggests it may be an experimental or test endpoint. No request/response schema is provided beyond the x402 challenge metadata indicating it returns `application/json` via HTTP POST. The endpoint is live and returning a valid 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api","data"],"synonyms":["pay-per-call API","x402 endpoint","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The endpoint /api/v1/lab/results/81 is not listed in the provider's public API catalog — it may be experimental or undocumented.","No request body schema or response schema is available; the only known output detail is mimeType 'application/json'.","The /pricing, /api, and /README pages returned no useful content (just 'Connect wallet'), so no additional documentation could be gathered."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/81","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but the specific resource '/api/v1/lab/results/81' has no documentation, no request/response schema, and does not appear in the site's public API catalog. Its purpose is unclear, making this effectively a stub 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'/request':13,28 '0.02':12,27,85,136 '000':76 '20':75 '402':211 '6':81 'Base network API' 'USDC micropayment API' 'accept':65 'access':7,22,41,63 'advertis':71 'ai':105 'analysi':109 'analyt':99 'api':6,21,40,62,141,171 'appear':164 'application/json':199 'base':9,24,52,77 'base-network' 'beyond':191 'broader':89 'call':4,19 'catalog':172 'challeng':70,194,212 'classif':112 'clear':159 'commit':149 'convers':129 'crypto-paid API' 'data':98,102 'decim':82 'document':160 'embed':113 'endpoint':32,96,132,154,185,204 'equal':84 'estim':123 'exchang':118 'experiment':182 'export':103 'feed':117 'financ':114 'gas':122 'generat':130 'geocod':127 'http':201 'http-post' 'indic':196 'infrastructur':125 'insight':104 'json-response' 'key':142 'lab/results':175 'land':168 'learn':107 'limit':145 'list':59 'live':206 'lowpaymentfee' 'lowpaymentfee.com':34,90 'machin':106 'main':167 'maxamountrequir':73 'may':179 'metadata':195 'metric':100 'minimum':148 'network':53 'no-api-key' 'offer':92 'page':169 'path':176 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':47 'per':3,18,38,86,137 'platform':91 'post':66,202 'premium':5,20,61 'premium API access' 'price':116,134 'protocol':45 'provid':35,190 'purpos':156 'quot':121 'rate':119,144 'report':101 'request':39,67,87,138 'request/response':187 'requir':150 'resourc':56 'return':198,208 'schema':188 'sentiment':108 'settl':46 'span':97 'specif':55,152 'suggest':177 'suit':94 'summar':111 'test':184 'text':110 'token':120 'unit':78 'usdc':15,30,49,80 'usdc-settlement' 'use':42 'util':126 'valid':128,210 'via':10,25,200 'web3':115 'x402':11,26,44,69,193 'x402 endpoint' 'x402-payment'","prices":[{"id":"2f677c89-b5f2-4ff6-be5f-c32da896bf18","listingId":"522ea88a-ab91-4e11-8a7d-ffdc01d7419b","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.754Z"}],"sources":[{"listingId":"522ea88a-ab91-4e11-8a7d-ffdc01d7419b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.754Z","lastSeenAt":"2026-04-22T02:32:04.670Z"}],"details":{"listingId":"522ea88a-ab91-4e11-8a7d-ffdc01d7419b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/81 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/81"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/81"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or lab results via a single micropayment without needing an API key","Integrating pay-per-use API calls into agent workflows that settle on Base in USDC","Testing x402 protocol payment flows with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integrations","AI agents needing keyless, pay-per-call API access","Projects that want to avoid subscription commitments for occasional API calls"],"notFor":["Users who need detailed documentation or well-defined request/response schemas before integrating","High-volume use cases where per-request pricing at $0.02 adds up significantly compared to subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.648Z"},"updatedAt":"2026-04-22T02:32:04.670Z"}}