{"id":"38835102-387d-47cb-9b35-bf9a7644c106","shortId":"JmFcvd","kind":"x402","title":"Query NFT ownership data via x402 micropayment on Base for $0.02 per request.","tagline":"Query NFT ownership data via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns NFT ownership information for NFT ID 39. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 \"exact\" scheme. The max amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call. There are no API keys, no rate limits, and no subscription commitments — callers pay per request with USDC on Base.\n\nThe specific endpoint `/api/v1/nfts/39/owner` appears to be an NFT-related query not prominently listed on the site's landing page, which showcases analytics, AI, finance, and utility endpoints. The NFT owner lookup may be part of an unlisted or supplementary set of endpoints. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no further detail. No OpenAPI schema or request/response examples are provided by the site.","tags":[],"capabilities":["nft-ownership-lookup","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC micropayment API","on-chain NFT data","token owner query","lowpaymentfee NFT"],"warnings":["No OpenAPI or schema documentation available for this endpoint","No request body or response body examples provided by the site","This specific NFT endpoint (/api/v1/nfts/39/owner) is not listed on the provider's landing page — it may be unlisted or experimental","The /pricing, /api, and /README pages contain no useful content beyond a 'Connect wallet' prompt","Response format and fields are entirely unknown — callers must discover them empirically"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/39/owner","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/39/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the NFT endpoint is not listed on the site's landing page. The /api, /pricing, and /README pages are empty beyond a wallet-connect 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'/api/v1/nfts/39/owner':138 '/pricing':188 '/readme':190 '0.02':11,24,112 '000':101 '0x8335':106 '20':100 '2913':107 '39':38 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':74 'across':52 'ai':159 'ai/ml':55 'amount':97 'analyt':54,158 'api':51,118 'appear':139 'base':9,22,68,102,109,134 'base-network' 'beyond':180 'broader':44 'call':114 'caller':127 'categori':59 'commit':126 'connect':196 'data':4,17,53 'detail':202 'document':179 'endpoint':28,73,137,163,178 'equal':111 'exact':93 'exampl':208 'financ':160 'finance/web3':56 'handl':82 'header':89 'id':37 'inform':34 'infrastructur':58 'inlin':83 'json':79 'json-response' 'key':119 'land':154,182 'limit':122 'list':149 'lookup':167 'lowpaymentfee NFT' 'lowpaymentfee.com':30 'max':96 'may':168 'micropay':7,20 'network':69 'nft':2,15,32,36,144,165 'nft-ownership-lookup' 'nft-relat':143 'no-api-key' 'offer':46 'on-chain NFT data' 'openapi':204 'owner':166 'ownership':3,16,33 'page':155,183,191 'part':41,170 'pay':48,128 'pay-per-request':47 'payment':80,88 'per':12,25,49,113,129 'platform':45 'post':75 'promin':148 'prompt':198 'protocol':65 'provid':210 'queri':1,14,146 'rate':121 'relat':145 'request':13,26,50,76,130 'request/response':207 'requir':98 'resolv':193 'return':31,78 'schema':205 'scheme':94 'set':176 'settl':61 'showcas':157 'site':152,213 'spars':185 'specif':136 'subscript':125 'supplementari':175 'token owner query' 'unit':103 'unlist':173 'usdc':71,105,132 'usdc-settlement' 'use':70,90 'util':162 'via':5,18,62,84 'wallet':197 'x':87 'x-payment':86 'x402':6,19,64,92 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"ff6bdca1-b11d-4638-90bc-e6a7969303c1","listingId":"38835102-387d-47cb-9b35-bf9a7644c106","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/39/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.514Z"}],"sources":[{"listingId":"38835102-387d-47cb-9b35-bf9a7644c106","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/39/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.514Z","lastSeenAt":"2026-04-22T10:03:09.235Z"}],"details":{"listingId":"38835102-387d-47cb-9b35-bf9a7644c106","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/39/owner \\\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 base units of USDC on Base (scheme: exact)","source_url":"https://lowpaymentfee.com/api/v1/nfts/39/owner"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/39/owner"}],"useCases":["Querying the current owner of a specific NFT (ID 39) programmatically","Integrating NFT ownership checks into agent workflows without API key management","Building Web3 dashboards that verify NFT holders via micropayment-gated API"],"bestFor":["Agents or apps needing quick NFT ownership lookups with no signup","Developers who want to pay per call with USDC on Base","Prototyping Web3 tools that need on-chain NFT data without running a node"],"notFor":["Bulk or high-volume NFT indexing across many token IDs (only one NFT ID exposed here)","Users who need fiat-only payment rails (this endpoint requires USDC on Base)","Anyone needing detailed NFT metadata beyond ownership"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.277Z"},"updatedAt":"2026-04-22T10:03:09.235Z"}}