{"id":"36b9e6ac-ddc8-4fad-9977-54ae2321a660","shortId":"cZQ2Gh","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 #79. It is part of a broader platform offering pay-per-call 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 specific endpoint `/api/v1/nfts/79/owner` accepts POST requests and is gated by an x402 payment challenge. The maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request. Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through on-chain micropayment.\n\nThe platform advertises a uniform $0.02/request pricing model across all its endpoints. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (402 challenge captured), but the actual response format for a paid request is unknown.","tags":[],"capabilities":["nft-ownership-query","x402-micropayment","usdc-payment","base-network","pay-per-request"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","who owns NFT","token holder query","x402 NFT API","Base USDC micropayment API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","The /api, /pricing, and /README pages contain no useful content beyond a wallet-connect prompt","The endpoint path suggests a hardcoded NFT ID (79); it is unclear whether other NFT IDs are supported or how to discover them","No examples of successful (paid) responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/79/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/79/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request body schema, no response examples, and the /api, /pricing, and /README pages are all empty wallet-connect prompts. The actual data returned by a paid call is 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'/api/v1/nfts/79/owner':74 '/pricing':157 '/readme':159 '/request':141 '0.02':11,24,103,140 '000':92 '0x8335':97 '20':91 '2913':98 '300':115 '402':197 '79':37 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':75 'access':126 'across':51,144 'actual':202 'addit':171 'advertis':125,137 'ai/ml':54 'amount':88 'analyt':53 'api':50,119 'avail':187 'base':9,22,67,93,100 'base-network' 'beyond':149 'broader':43 'call':49 'captur':199 'categori':58 'chain':133 'challeng':85,198 'confirm':195 'connect':167 'crawl':190 'data':4,17,52 'detail':173 'document':148,182 'endpoint':28,73,147,193 'equal':102 'exact':111 'exampl':186 'finance/web3':55 'format':204 'gate':80 'grant':128 'inform':34 'infrastructur':57 'key':120 'land':151 'limit':123 'live':196 'lowpaymentfee.com':30 'made':108 'materi':191 'maximum':87 'micropay':7,20,134 'model':143 'network':68 'nft':2,15,32,36 'nft-ownership-query' 'offer':45 'on-chain':131 'openapi':177 'ownership':3,16,33 'page':152,160 'paid':207 'part':40 'pay':47 'pay-per-cal':46 'pay-per-request' 'payment':84,106 'per':12,25,48,104 'platform':44,136 'post':76 'price':142 'prompt':168 'protocol':64 'pure':129 'queri':1,14 'rate':122 'request':13,26,77,105,208 'request/response':180 'requir':89 'resolv':162 'respons':203 'return':31 'schema':181 'scheme':112 'second':116 'settl':60 'spars':154 'spec':178 'specif':72 'technic':172 'timeout':117 'token holder query' 'uniform':139 'unit':94 'unknown':210 'usag':185 'usdc':70,96 'usdc-payment' 'use':69 'via':5,18,61,109 'wallet':166 'wallet-connect':165 'who owns NFT' 'x402':6,19,63,83 'x402 NFT API' 'x402-micropayment'","prices":[{"id":"50757fed-bef7-4b50-9bf9-753f83da2c44","listingId":"36b9e6ac-ddc8-4fad-9977-54ae2321a660","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/79/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":"2026-04-21T18:32:32.548Z"}],"sources":[{"listingId":"36b9e6ac-ddc8-4fad-9977-54ae2321a660","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/79/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.548Z","lastSeenAt":"2026-04-22T07:02:17.428Z"}],"details":{"listingId":"36b9e6ac-ddc8-4fad-9977-54ae2321a660","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/79/owner \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","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 network","source_url":"https://lowpaymentfee.com/api/v1/nfts/79/owner"},{"claim":"The platform advertises $0.02 per request uniform pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/79/owner"}],"useCases":["Looking up the current owner of a specific NFT programmatically","Integrating NFT ownership checks into agent workflows without API keys","Verifying NFT provenance or holder status in automated pipelines"],"bestFor":["Agents needing quick NFT ownership lookups with no signup","Developers prototyping x402 payment flows on Base","Applications requiring on-demand NFT data without subscription commitments"],"notFor":["Bulk or batch NFT ownership queries across large collections (no documented batch endpoint)","Users who need detailed NFT metadata beyond ownership","Applications requiring free or subscription-based access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.841Z"},"updatedAt":"2026-04-22T07:02:17.428Z"}}