{"id":"0f0eaba6-8b89-4ae6-bc42-2b4c0bee1677","shortId":"LFpNfc","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 17. It is part of a broader suite of x402-protocol APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints on the platform share a uniform pricing model of $0.02 per request, settled in USDC on the Base network.\n\nThe endpoint is live and responds with a standard x402 payment challenge (HTTP 402) requiring an X-PAYMENT header. Payment is made in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base) using the \"exact\" scheme. The maxAmountRequired is 20,000 base units, which at 6 decimals equals $0.02. No API keys or rate limits are advertised; access is gated purely by per-request micropayment.\n\nThe specific functionality of this endpoint — NFT owner lookup — is not documented in detail on the provider's landing page, which focuses on broader API categories. The endpoint path suggests it returns the current owner of a specific NFT (ID 17). No request body schema or response schema is documented, so the exact fields returned are unknown. The provider's site lists many endpoint categories but the NFT endpoints are not prominently featured among them, making this a less-documented offering.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-payment","base-network","per-request-billing","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner query","NFT ownership API","token holder lookup","x402 NFT endpoint","Base USDC micropayment API","on-chain NFT data"],"warnings":["No request or response schema documented for this endpoint","NFT endpoint not listed among the provider's advertised API categories — may be experimental or undocumented","Endpoint is specific to NFT ID 17; unclear if other NFT IDs are supported via different paths","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/17/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/17/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 challenge with clear pricing, but there is no documented request/response schema, no OpenAPI spec, and the NFT endpoint is not mentioned on the provider's landing page. The actual data returned is entirely unknown, making this effectively a stub 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'000':123 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':112 '17':38,189 '20':122 '402':99 '6':128 'Base USDC micropayment API' 'NFT owner query' 'NFT ownership API' 'access':140 'advertis':139 'ai/ml':59 'among':222 'analyt':58 'api':50,133,173 'base':9,22,84,114,124 'base-network' 'bodi':192 'broader':44,172 'categori':174,213 'challeng':97 'contract':111 'current':182 'data':4,17,57 'decim':129 'detail':162 'document':160,198,229 'endpoint':28,66,87,154,176,212,217 'equal':130 'exact':117,201 'featur':221 'field':202 'finance/web3':61 'focus':170 'function':151 'gate':142 'header':105 'http':98 'id':37,188 'infer':60 'inform':34 'infrastructur':63 'key':134 'land':167 'less':228 'less-docu':227 'limit':137 'list':210 'live':89 'lookup':157 'lowpaymentfee.com':30 'made':108 'make':224 'mani':211 'maxamountrequir':120 'micropay':7,20,148 'model':74 'network':85 'nft':2,15,32,36,155,187,216 'nft-ownership-lookup' 'no-api-key' 'offer':51,230 'on-chain NFT data' 'owner':156,183 'ownership':3,16,33 'page':168 'part':41 'path':177 'payment':96,104,106 'per':12,25,77,146 'per-request':145 'per-request-billing' 'platform':69 'price':73 'promin':220 'protocol':49 'provid':55,165,207 'pure':143 'queri':1,14 'rate':136 'request':13,26,78,147,191 'requir':100 'respond':91 'respons':195 'return':31,180,203 'schema':193,196 'scheme':118 'settl':79 'share':70 'site':209 'span':56 'specif':150,186 'standard':94 'suggest':178 'suit':45 'token holder lookup' 'uniform':72 'unit':125 'unknown':205 'usdc':81,110 'usdc-payment' 'use':115 'util':64 'via':5,18 'x':103 'x-payment':102 'x402':6,19,48,95 'x402 NFT endpoint' 'x402-micropayment' 'x402-protocol':47","prices":[{"id":"304e6e60-89b5-49dd-838b-7ebb2027fa89","listingId":"0f0eaba6-8b89-4ae6-bc42-2b4c0bee1677","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/17/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":"2026-04-21T18:32:27.460Z"}],"sources":[{"listingId":"0f0eaba6-8b89-4ae6-bc42-2b4c0bee1677","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/17/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.460Z","lastSeenAt":"2026-04-22T21:32:16.179Z"}],"details":{"listingId":"0f0eaba6-8b89-4ae6-bc42-2b4c0bee1677","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/17/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 provider advertises $0.02 per request with no API keys, no rate limits, and payment on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units in USDC on Base (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/nfts/17/owner"},{"claim":"The provider lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying the current owner of a specific NFT programmatically","Integrating NFT ownership checks into agent workflows without API key management","Verifying NFT holder status before granting access or privileges"],"bestFor":["Agents needing on-demand NFT ownership data with no subscription","Developers prototyping NFT-aware applications with pay-per-call pricing","Workflows requiring permissionless, key-free API access on Base"],"notFor":["Bulk querying ownership across many NFTs (no batch endpoint documented)","Looking up arbitrary NFT IDs (this endpoint is hardcoded to NFT 17)","Users who need detailed NFT metadata beyond ownership"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.355Z"},"updatedAt":"2026-04-22T21:32:16.179Z"}}