{"id":"cc05fa98-b912-4de7-aa5d-53a4ac6409e8","shortId":"9FkRdr","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 a specific NFT (ID 12) via a POST request. It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, all settled on the Base network using USDC. The x402 protocol means no API keys or accounts are needed — callers attach a payment header and receive the response directly.\n\nThe specific endpoint `/api/v1/nfts/12/owner` costs $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The response MIME type is `application/json`. The payment timeout is 300 seconds.\n\nThe provider also offers endpoints for analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data, and utility services, all at the same $0.02 per-request price point. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional content. The exact schema of the NFT owner response is not documented.","tags":[],"capabilities":["nft-ownership-query","x402-micropayment","base-network","usdc-payment","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC micropayment API","on-chain NFT data","token owner query"],"warnings":["No response schema documented — the structure of the NFT owner response is unknown","No request body schema documented — unclear if a POST body is required or what fields it accepts","The endpoint path is hardcoded to NFT ID 12; it is unclear whether other NFT IDs are supported via different URLs","Documentation pages (/api, /pricing, /README) are empty beyond a wallet-connect prompt","The provider landing page lists many API categories but none appear to be NFT-related, making this endpoint's purpose ambiguous"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/12/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/12/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 accepts payments. However, there is no documentation of the request body schema, response schema, or what data is actually returned. The /api, /pricing, and /README pages are all empty wallet-connect prompts. The endpoint is hardcoded to a single NFT ID (12), and the description 'Premium API Access' is generic. This is effectively a stub 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'/api/v1/nfts/12/owner':93 '/pricing':170 '/readme':172 '0.02':11,24,95,155 '000':99 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':112 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':119 '12':40 '20':98 '300':130 '6':105 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'account':77 'addit':184 'address':111 'ai/ml':139 'also':134 'analysi':142 'analyt':138 'api':57,74 'application/json':125 'attach':81 'base':9,22,65,100,118 'base-network' 'beyond':162 'broader':50 'call':56 'caller':80 'classif':144 'connect':180 'content':185 'contract':116 'cost':94 'data':4,17,147 'decim':106 'direct':89 'document':161,196 'embed':145 'endpoint':28,92,136 'exact':187 'finance/crypto':146 'header':84 'id':39 'infer':140 'inform':34 'key':75 'land':164 'lowpaymentfee.com':30,60 'made':109 'mean':72 'micropay':7,20 'mime':122 'need':79 'network':66 'nft':2,15,32,38,191 'nft-ownership-query' 'no-api-key' 'offer':58,135 'on-chain NFT data' 'owner':192 'ownership':3,16,33 'page':165,173 'part':47 'pay':54 'pay-per-cal':53 'pay-per-request' 'payment':83,107,127 'per':12,25,55,96,157 'per-request':156 'point':160 'post':43 'price':159 'prompt':181 'protocol':71 'provid':133 'queri':1,14 'receiv':86 'request':13,26,44,97,158 'resolv':175 'respons':88,121,193 'return':31 'schema':188 'second':131 'sentiment':141 'servic':150 'settl':62 'spars':167 'specif':37,91 'suit':51 'summar':143 'timeout':128 'token owner query' 'type':123 'unit':101 'usdc':68,103,115 'usdc-payment' 'use':67,113 'util':149 'via':5,18,41 'wallet':179 'wallet-connect':178 'x402':6,19,70 'x402 NFT endpoint' 'x402-micropayment'","prices":[{"id":"e391466a-a059-4ec1-8ccc-d0f2b7df5a3c","listingId":"cc05fa98-b912-4de7-aa5d-53a4ac6409e8","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/12/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":"2026-04-21T18:32:27.487Z"}],"sources":[{"listingId":"cc05fa98-b912-4de7-aa5d-53a4ac6409e8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/12/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.487Z","lastSeenAt":"2026-04-22T21:32:16.204Z"}],"details":{"listingId":"cc05fa98-b912-4de7-aa5d-53a4ac6409e8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/12/owner \\\n  -H \"X-PAYMENT: <x402_payment_header>\" \\\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 HTTP 402 with an x402 challenge requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/12/owner"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/12/owner"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and USDC asset is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/12/owner"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Looking up the current owner of a specific NFT programmatically","Integrating NFT ownership checks into agent workflows without API key management","Verifying NFT ownership as part of a gating or access-control flow"],"bestFor":["Agents needing quick NFT ownership lookups with no signup","Developers testing x402 payment flows on Base","Low-volume, pay-as-you-go NFT data queries"],"notFor":["Bulk or batch NFT ownership queries across many token IDs (only token 12 is exposed at this URL)","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":"2026-02-17T23:12:59.449Z"},"updatedAt":"2026-04-22T21:32:16.204Z"}}