{"id":"c2d8356b-bf93-4eb0-aeae-2e2844bcf8eb","shortId":"Eru7Q2","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/16` is listed under \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). No API keys, rate limits, or subscriptions are required — each request is paid individually via 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 at $0.02 per request.\n\nThe specific endpoint `/api/v1/lab/results/16` is labeled \"Premium API Access\" but its exact response payload and purpose are not documented in the available material. The endpoint accepts POST requests and returns application/json. Without further documentation or an OpenAPI schema, the precise input parameters and output structure remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["data","api-marketplace"],"synonyms":["lowpaymentfee","low payment fee API","x402 paid API","USDC micropayment API","pay-per-call API","Base network API","premium data endpoint"],"warnings":["No OpenAPI or schema documentation available — input parameters and response structure are unknown","The specific purpose of /api/v1/lab/results/16 ('Premium API Access') is not explained anywhere in the crawled material","The /api, /pricing, and /README pages returned no meaningful content","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/16","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/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation of request/response formats, and the purpose of '/api/v1/lab/results/16' is entirely opaque. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful 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'/request':13,28 '0.02':12,27,68,82,151 '000':74 '20':73 '6':80 'Base network API' 'USDC micropayment API' 'accept':179 'access':7,22,41,63,162 'ai':120 'analysi':124 'analyt':114 'api':6,21,40,62,84,161 'application/json':184 'avail':175 'base':9,24,52,75 'base-network' 'broader':104 'call':4,19,70 'classif':127 'convers':144 'cost':65 'data':113,117 'decim':81 'document':172,187 'embed':128 'endpoint':32,111,147,156,178 'estim':138 'exact':165 'exchang':133 'export':118 'feed':132 'financ':129 'gas':137 'generat':145 'geocod':142 'header':102 'individu':96 'infrastructur':140 'input':194 'insight':119 'json-response' 'key':85 'label':159 'learn':122 'limit':87 'list':59 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,105 'machin':121 'materi':176 'maxamountrequir':71 'metric':115 'network':53 'no-api-key' 'offer':107 'openapi':190 'output':197 'paid':95 'paramet':195 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payload':167 'payment':47,101 'per':3,18,38,69,152 'platform':106 'post':180 'post-method' 'precis':193 'premium':5,20,61,160 'premium data endpoint' 'price':131,149 'protocol':45 'provid':35 'purpos':169 'quot':136 'rate':86,134 'remain':199 'report':116 'request':39,93,153,181 'requir':91 'resourc':56 'respons':166 'return':183 'schema':191 'sentiment':123 'settl':46 'span':112 'specif':55,155 'structur':198 'subscript':89 'suit':109 'summar':126 'text':125 'token':135 'unit':76 'unknown':200 'usdc':15,30,49,78 'usdc-settlement' 'use':42 'util':141 'valid':143 'via':10,25,97 'web3':130 'without':185 'x':100 'x-payment':99 'x402':11,26,44 'x402 paid API' 'x402-payment'","prices":[{"id":"14babc5c-bcbe-4b54-96b7-d151104aa611","listingId":"c2d8356b-bf93-4eb0-aeae-2e2844bcf8eb","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/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.004Z"}],"sources":[{"listingId":"c2d8356b-bf93-4eb0-aeae-2e2844bcf8eb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.004Z","lastSeenAt":"2026-04-22T05:32:13.035Z"}],"details":{"listingId":"c2d8356b-bf93-4eb0-aeae-2e2844bcf8eb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/16 \\\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 with maxAmountRequired of 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/16"},{"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":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or lab results behind a per-request paywall","Agent-driven workflows that need on-demand paid API calls without subscription management","Programmatic access to paid endpoints using USDC micropayments on Base"],"bestFor":["Agents or developers who want zero-commitment, pay-as-you-go API access","Use cases requiring no API key registration or rate limit negotiation","Crypto-native applications already operating on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.894Z"},"updatedAt":"2026-04-22T05:32:13.035Z"}}