{"id":"f02ca03b-b423-4d11-ac3a-c15edb7fc3d6","shortId":"cuYcJ9","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 the owner of NFT #89 via a pay-per-call x402 protocol. The endpoint accepts POST requests and is settled in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform offers a wide catalog of x402-gated endpoints spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request and settle on Base via USDC.\n\nThis specific endpoint (/api/v1/nfts/89/owner) appears to be an NFT ownership lookup. The response format is application/json. No OpenAPI schema or detailed documentation for request/response bodies was found beyond the x402 challenge metadata, so the exact fields returned are not confirmed. The endpoint is live and responding with a proper 402 challenge.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","token holder query","ERC-721 owner","NFT metadata","on-chain NFT data","x402 NFT endpoint"],"warnings":["No OpenAPI or detailed API documentation available for this endpoint.","The /api/v1/nfts/89/owner path is not listed among the advertised endpoints on the homepage — it may be undocumented or experimental.","Request and response body schemas are unknown; example_request_json and example_response_json are null.","Only NFT #89 is referenced; it is unclear whether other NFT IDs are supported at similar paths."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/89/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/89/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing and network info. However, there is no OpenAPI schema, no documented request/response body structure, and the crawled pages beyond the homepage were empty. The specific NFT endpoint is not listed on the homepage catalog, making its exact behavior inferrable but 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'0.02':11,24,76,148 '000':67 '20':66 '402':206 '6':72 '89':36 'ERC-721 owner' 'NFT metadata' 'NFT owner lookup' 'NFT ownership API' 'accept':47 'advertis':62 'ai/ml':118 'analysi':121 'analyt':117 'api':80 'appear':161 'application/json':172 'attach':90 'base':9,22,57,68,154 'base-network' 'beyond':184 'bodi':181 'broader':103 'call':42 'caller':88 'catalog':109 'challeng':61,187,207 'classif':123 'confirm':196 'convers':140 'data':4,17,116,126 'decim':73 'detail':177 'document':178 'embed':124 'endpoint':28,46,114,143,159,198 'equal':75 'estim':134 'exact':191 'exchang':129 'feed':128 'field':192 'finance/web3':125 'format':170 'found':183 'gas':133 'gate':113 'generat':141 'geocod':138 'header':95 'infer':119 'infrastructur':136 'json-response' 'key':81 'limit':83 'live':200 'lookup':167 'lowpaymentfee.com':30,104 'maxamountrequir':64 'metadata':188 'micropay':7,20 'network':58 'nft':2,15,35,165 'nft-ownership-lookup' 'no-api-key' 'offer':106 'on-chain NFT data' 'openapi':174 'owner':33 'ownership':3,16,166 'pay':40 'pay-per-cal':39 'pay-per-call' 'payment':94,100 'per':12,25,41,77,149 'platform':105 'post':48 'price':127,146 'proof':101 'proper':205 'protocol':44 'queri':1,14 'quot':132 'rate':82,130 'request':13,26,49,78,150 'request/response':180 'requir':87 'respond':202 'respons':169 'return':31,193 'schema':175 'sentiment':120 'settl':52,152 'simpli':89 'span':115 'specif':158 'subscript':85 'summar':122 'token':131 'token holder query' 'uniform':145 'unit':69 'usdc':54,71,156 'usdc-settlement' 'util':137 'valid':98,139 'via':5,18,37,155 'wide':108 'x':93 'x-payment':92 'x402':6,19,43,60,99,112,186 'x402 NFT endpoint' 'x402-gated':111 'x402-micropayment'","prices":[{"id":"b72c733f-cca8-434a-b21d-f73ff247992c","listingId":"f02ca03b-b423-4d11-ac3a-c15edb7fc3d6","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/89/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":"2026-04-21T18:32:32.350Z"}],"sources":[{"listingId":"f02ca03b-b423-4d11-ac3a-c15edb7fc3d6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/89/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.350Z","lastSeenAt":"2026-04-22T08:32:26.339Z"}],"details":{"listingId":"f02ca03b-b423-4d11-ac3a-c15edb7fc3d6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/89/owner \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/89/owner"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/89/owner"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying the current owner of a specific NFT programmatically","Building dashboards that display NFT ownership information","Verifying NFT ownership before granting access or privileges","Integrating NFT holder data into agent workflows without managing API keys"],"bestFor":["Agents or apps needing quick, keyless NFT ownership checks","Developers who prefer pay-per-call over subscription billing","Web3 projects settling API costs on-chain via USDC on Base"],"notFor":["Bulk enumeration of all NFT owners across a collection (single-NFT endpoint)","Users who need free or ad-supported NFT data","Applications requiring detailed NFT metadata beyond ownership"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.11Z"},"updatedAt":"2026-04-22T08:32:26.339Z"}}