{"id":"47a6f61d-99c6-4fec-81ee-9ceab4eed413","shortId":"gExaYL","kind":"x402","title":"x402-gated NFT/premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated NFT/premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","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/nfts/81` 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 utility services — all priced at $0.02 per request.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made via the \"exact\" scheme to the specified wallet address, with a maximum amount of 20,000 base units of USDC (0.02 USDC, i.e., $0.02). The asset contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` is the canonical USDC contract on Base. No API keys or rate limits are advertised — access is purely gated by per-request micropayment.\n\nThe specific functionality of the `/api/v1/nfts/81` endpoint is unclear from the available material. The landing page does not list an NFT-related API category, and the endpoint path suggests it may return data about a specific NFT (ID 81). No request/response schema or documentation beyond the x402 challenge is available, so the exact input parameters and output format remain unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-call","nft-data","no-api-key","post-method"],"categories":["web3","data"],"synonyms":["NFT API","x402 API","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee","premium API access"],"warnings":["No documentation or OpenAPI schema available for this endpoint","The /api/v1/nfts/ path is not listed among the site's advertised API categories — its functionality is unknown","No example request or response data is available","The /pricing, /api, and /README pages returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/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/nfts/81","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 documentation, no request/response schema, and the specific purpose of /api/v1/nfts/81 is not described anywhere on the site. This is effectively a stub 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'/request':17,34 '0.02':16,33,88,126,129 '000':121 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':133 '20':120 '81':197 'Base network API' 'NFT API' 'USDC micropayment API' 'accept':100 'access':42,149 'address':114 'advertis':148 'ai/ml':78 'amount':118 'analyt':77 'api':5,22,41,74,142,181 'appear':59 'asset':131 'avail':169,208 'base':8,25,53,122,140 'base-network' 'behind':43 'beyond':203 'broader':65 'call':12,29,73 'canon':136 'categori':182 'challeng':93,206 'confirm':94 'contract':132,138 'data':76,81,191 'document':202 'dozen':68 'endpoint':6,23,36,96,164,185 'exact':108,211 'finance/web3':80 'format':216 'function':160 'gate':3,20,152 'i.e':128 'id':196 'infer':79 'input':212 'key':143 'land':172 'limit':146 'list':176 'live':98 'lowpaymentfee' 'lowpaymentfee.com':38 'made':105 'materi':170 'maximum':117 'may':189 'micropay':157 'network':54 'nft':179,195 'nft-data' 'nft-relat':178 'nft/premium':4,21 'no-api-key' 'offer':67 'output':215 'page':173 'paramet':213 'part':62 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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/nfts/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":"2026-04-21T18:32:32.462Z"}],"sources":[{"listingId":"47a6f61d-99c6-4fec-81ee-9ceab4eed413","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.462Z","lastSeenAt":"2026-04-22T04:02:46.943Z"}],"details":{"listingId":"47a6f61d-99c6-4fec-81ee-9ceab4eed413","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/81 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/81"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure — but no NFT category","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or details via a single micropayment","Programmatic access to premium data without API key management","Agent-driven pay-as-you-go API consumption on Base"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments in USDC on Base","Users who need occasional NFT data without subscription commitments"],"notFor":["High-volume consumers needing bulk/subscription pricing","Users who need detailed API documentation or OpenAPI specs before integrating","Anyone requiring non-USDC or non-Base payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.062Z"},"updatedAt":"2026-04-22T04:02:46.943Z"}}