{"id":"52cac638-12c6-48da-8a1b-2b24514e159f","shortId":"8A8uPt","kind":"x402","title":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall, settling payments in USDC on the Base network. The specific resource `/api/v1/lab/results/42` appears to be part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is via the \"exact\" scheme, requiring up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) sent to the specified payTo address on Base. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific resource path `/api/v1/lab/results/42` is labeled \"Premium API Access\" but is not individually described on the landing page, so its exact response payload is unknown. It likely returns JSON (the challenge specifies `application/json` as the MIME type). The broader platform hosts endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more, all at the same $0.02 price point.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium data endpoint","402 payment required API"],"warnings":["The specific endpoint /api/v1/lab/results/42 is not listed on the provider's landing page and has no dedicated documentation.","No OpenAPI schema, request body schema, or response schema is available for this endpoint.","The broader platform's individual endpoint descriptions are minimal — only names and prices are shown.","The /api, /pricing, and /README pages returned no meaningful content (only 'Connect wallet')."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/42","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/42","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 /api/v1/lab/results/42 has no documentation, no schema, no example request/response, and its purpose (\"Premium API Access\") is generic. The crawled pages beyond the landing page returned only wallet-connect stubs with no useful 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'0.02':10,24,82,112,215 '000':107 '20':106 '402 payment required API' '6':117 'Base network API' 'USDC micropayment API' 'accept':94 'access':36,138,162 'address':124 'advertis':129 'ai/ml':72 'analysi':198 'analyt':71 'api':5,19,35,68,131,161 'appear':53 'application/json':186 'attach':141 'base':8,22,47,108,126 'behind':37 'broader':59,192 'call':67 'caller':139 'challeng':87,184 'classif':201 'confirm':88 'data':70,75 'decim':118 'describ':167 'dozen':62 'embed':202 'endpoint':6,20,30,90,195 'exact':101,174 'exchang':205 'feed':204 'finance/web3':74 'gate':3,17 'geocod':207 'header':146 'host':194 'individu':166 'infer':73 'infrastructur':77 'instant':137 'json':182 'json-response' 'key':132 'label':159 'land':170 'like':180 'limit':135 'live':92 'lowpaymentfee' 'lowpaymentfee.com':32 'mime':189 'network':48 'no-api-key' 'offer':61 'page':171 'part':56 'path':156 'pay':9,23,65 'pay-per-cal':64 'pay-per-call API' 'pay-per-request' 'payload':176 'payment':42,97,145,151 'payto':123 'paywal':40 'per':11,25,66,83 'platform':60,128,193 'point':217 'post':95 'post-method' 'premium':4,18,34,160 'premium data endpoint' 'price':80,203,216 'proof':152 'provid':33 'rate':134,206 'request':12,26,84,96 'requir':103 'resourc':51,155 'respons':175 'return':181 'scheme':102 'sent':119 'sentiment':197 'settl':41 'simpli':140 'sinc':114 'span':69 'specif':50,154 'specifi':122,185 'summar':200 'text':199 'type':190 'unit':109 'unknown':178 'usd':113 'usdc':14,28,44,111,115 'usdc-base' 'use':116 'util':78 'valid':149,208 'via':99 'x':144 'x-payment':143 'x402':2,16,39,86,150 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"1adc69df-4ba2-427e-b622-fe1ad7ff7c36","listingId":"52cac638-12c6-48da-8a1b-2b24514e159f","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.362Z"}],"sources":[{"listingId":"52cac638-12c6-48da-8a1b-2b24514e159f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.362Z","lastSeenAt":"2026-04-22T01:02:20.064Z"}],"details":{"listingId":"52cac638-12c6-48da-8a1b-2b24514e159f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/42 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/42"},{"claim":"All listed APIs 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 & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/42"}],"useCases":["Accessing premium data or lab results via a single micropayment without subscription","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Programmatic access to a broad suite of analytics, AI, finance, and utility endpoints at $0.02 each"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents with Base USDC wallets needing instant API access without API keys","Prototyping and low-volume usage where subscription plans are overkill"],"notFor":["High-volume production workloads where per-request pricing adds up quickly","Users without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.256Z"},"updatedAt":"2026-04-22T01:02:20.064Z"}}