{"id":"31ec48d5-fedb-4017-bfe0-b9e560b8a742","shortId":"VVnCHN","kind":"x402","title":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/nfts/56` is part of the lowpaymentfee.com platform, which offers a broad catalog of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific resource at `/nfts/56` is labeled \"Premium API Access\" and appears to serve NFT-related data (likely for NFT ID 56), though the exact response schema is not documented.\n\nThe endpoint is live and returns a valid x402 challenge. Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required is 20,000 base units, which at 6 decimals equals $0.02 per request. The platform advertises uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments. Requests are made via HTTP POST.\n\nDocumentation is minimal — the site's landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. Because of this, the exact input parameters and response format for the NFTs endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key","http-post"],"categories":["web3","nft"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","pay-per-call NFT","Base USDC API","lowpaymentfee","premium API access","crypto NFT lookup"],"warnings":["No request or response schema documented — input parameters and output format are unknown.","The /api, /pricing, and /README pages return only a 'Connect wallet' prompt with no useful documentation.","The endpoint name 'Premium API Access' is generic and does not describe the actual NFT functionality.","The broader lowpaymentfee.com platform lists many endpoints but none have detailed docs; quality of underlying data sources is unverifiable."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/56","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/56","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 challenge with clear pricing, but there is no documentation of request parameters, response schema, or usage examples. The NFT-specific functionality is entirely undocumented beyond the URL path and generic 'Premium API Access' 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'/api/v1/nfts/56':32 '/nfts/56':66 '/pricing':183 '/readme':185 '/request':136 '0.02':10,24,128,135 '000':120 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':113 '20':119 '56':84 '6':125 'Base USDC API' 'NFT API' 'NFT data endpoint' 'access':71 'across':138 'addit':196 'advertis':133 'ai/ml':56 'amount':116 'analyt':55 'api':52,70,143 'appear':73 'avail':167 'base':8,22,108,121 'base-network' 'broad':42 'call':51 'catalog':43 'challeng':102 'commit':151 'connect':191 'content':197 'contract':112 'crypto NFT lookup' 'data':5,19,54,79 'decim':126 'descript':177 'document':92,158 'endpoint':6,20,30,94,140,168,211 'equal':127 'exact':87,202 'exampl':180 'finance/web3':58 'format':207 'gate':3,17 'http':156 'http-post' 'id':83 'infer':57 'infrastructur':60 'input':203 'key':144 'label':68 'land':164 'like':80 'limit':147 'list':166 'live':96 'lowpaymentfee' 'lowpaymentfee.com':37 'made':154 'maximum':115 'minim':160 'minimum':150 'network':109 'nft':4,18,77,82 'nft-data' 'nft-relat':76 'nfts':210 'no-api-key' 'offer':40 'page':165,186 'paramet':176,204 'part':34 'pay':9,23,49 'pay-per-cal':48 'pay-per-call NFT' 'pay-per-request' 'payment':103 'per':11,25,50,129 'platform':38,132 'post':157 'premium':69 'premium API access' 'price':137,170 'prompt':193 'protocol':47 'provid':172 'rate':146 'relat':78 'remain':212 'request':12,26,130,152 'request/response':174 'requir':117 'resolv':188 'resourc':64 'respons':88,206 'return':98 'schema':89,175 'serv':75 'settl':105 'site':162 'span':53 'specif':63 'though':85 'uniform':134 'unit':122 'unknown':213 'usag':179 'usdc':14,28,111 'usdc-settlement' 'use':110 'util':61 'valid':100 'via':155 'wallet':192 'x402':2,16,46,101 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':45","prices":[{"id":"5c2623b3-a0ad-4b23-bd45-ce7905778b57","listingId":"31ec48d5-fedb-4017-bfe0-b9e560b8a742","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/nfts/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.368Z"}],"sources":[{"listingId":"31ec48d5-fedb-4017-bfe0-b9e560b8a742","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/56","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.368Z","lastSeenAt":"2026-04-22T15:03:11.820Z"}],"details":{"listingId":"31ec48d5-fedb-4017-bfe0-b9e560b8a742","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/56 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/56"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/56"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or details for a specific token ID","Integrating NFT data into agent workflows without managing API keys","Pay-per-call NFT queries settled in USDC on Base"],"bestFor":["Agents needing keyless, on-demand NFT data access","Developers who want to pay per request with no subscription","x402-compatible wallets and agent frameworks on Base"],"notFor":["Bulk NFT data retrieval (no documented batch endpoints)","Users who need detailed API documentation or guaranteed SLAs","Non-crypto payment workflows (only USDC on Base is accepted)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.819Z"},"updatedAt":"2026-04-22T15:03:11.820Z"}}