{"id":"d46af279-7c26-4ab1-97f6-7b93acaf2717","shortId":"kXUzTX","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 #57. It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/nfts/57/owner` accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact-payment scheme. The maximum amount required is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). There are no API keys, no rate limits, and no upfront commitments — each call is independently paid for at the time of the request.\n\nThe platform advertises a uniform $0.02 per request pricing across all its endpoints. Settlement occurs on the Base L2 network to the address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the USDC contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913. The endpoint is live and returning a proper 402 challenge. However, no documentation exists for the request body schema or the response format of this specific NFT owner endpoint, so the exact fields returned are unknown.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-settlement","base-network","pay-per-request","no-api-key"],"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 request body schema documented — unclear what POST body (if any) is expected","No response schema documented — the shape of the returned NFT owner data is unknown","The endpoint is hardcoded to NFT #57; it is unclear whether other NFT IDs are supported at different paths","Crawled /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')","No OpenAPI or ai-plugin manifest available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/57/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/57/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 and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no documentation for request/response schemas, and the crawled pages beyond the homepage are empty wallet-connect stubs. The specific NFT endpoint's purpose is only inferable from the URL path. This is effectively a stub 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'0.02':11,24,110,146 '000':105 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':164 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':170 '20':104 '402':179 '57':37 '6':115 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':76 'across':51,150 'address':163 'advertis':143 'ai/ml':54 'amount':101 'analyt':53 'api':50,120 'base':9,22,68,106,158 'base-network' 'bodi':188 'broader':43 'call':49,130 'categori':59 'challeng':180 'commit':128 'contract':168 'data':4,17,52 'decim':116 'document':183 'endpoint':28,74,153,172,199 'exact':96,202 'exact-pay':95 'exist':184 'field':203 'finance/web3':56 'format':193 'handl':84 'header':91 'howev':181 'independ':132 'infer':55 'inform':34 'infrastructur':58 'inlin':85 'json':81 'key':121 'l2':159 'limit':124 'live':174 'lowpaymentfee.com':30 'maximum':100 'micropay':7,20 'network':69,160 'nft':2,15,32,36,197 'nft-ownership-lookup' 'no-api-key' 'occur':155 'offer':45 'owner':198 'ownership':3,16,33 'paid':133 'part':40 'pay':47 'pay-per-cal':46 'pay-per-request' 'payment':82,90,97 'per':12,25,48,147 'platform':44,142 'post':77 'price':149 'proper':178 'protocol':65 'queri':1,14 'rate':123 'request':13,26,78,140,148,187 'requir':102 'respons':192 'return':31,80,176,204 'schema':189 'scheme':98 'settl':61 'settlement':154 'sinc':112 'specif':73,196 'time':137 'token holder query' 'uniform':145 'unit':107 'unknown':206 'upfront':127 'usd':111 'usdc':71,109,113,167 'usdc-settlement' 'use':70,92,114,165 'via':5,18,62,86 'who owns NFT' 'x':89 'x-payment':88 'x402':6,19,64,94 'x402 NFT API' 'x402-micropayment'","prices":[{"id":"54103a41-a257-41df-83a6-bd5de368bbb0","listingId":"d46af279-7c26-4ab1-97f6-7b93acaf2717","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/57/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":"2026-04-21T18:32:32.917Z"}],"sources":[{"listingId":"d46af279-7c26-4ab1-97f6-7b93acaf2717","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/57/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.917Z","lastSeenAt":"2026-04-22T04:02:47.468Z"}],"details":{"listingId":"d46af279-7c26-4ab1-97f6-7b93acaf2717","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/57/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","source_url":"https://lowpaymentfee.com/api/v1/nfts/57/owner"},{"claim":"Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/57/owner"}],"useCases":["Querying the current owner of a specific NFT programmatically","Building NFT portfolio dashboards that need on-demand ownership checks","Agent workflows that verify NFT ownership before executing downstream logic"],"bestFor":["Developers needing simple pay-per-call NFT ownership data without API key management","AI agents that can settle x402 payments on Base","Low-volume or sporadic NFT ownership queries where a subscription model is overkill"],"notFor":["Bulk enumeration of all NFT owners across a collection (single-NFT endpoint, no batch support evident)","Users who cannot transact in USDC on the Base network","Applications requiring detailed NFT metadata beyond ownership"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.215Z"},"updatedAt":"2026-04-22T04:02:47.468Z"}}