{"id":"f2f962e8-f498-4f3d-933f-55ec72fd9a30","shortId":"3TCsAC","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 owner information for a given NFT (token ID 50 in the probed URL). It is part of a broader suite of x402-enabled APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe endpoint uses the x402 payment protocol (version 1, \"exact\" scheme). Callers must include an X-PAYMENT header with a valid payment proof. The asset is USDC (contract 0x8335…2913 on Base), and the maxAmountRequired is 20,000 base units, which equals $0.02 (USDC has 6 decimals). No API keys or rate limits are advertised; access is gated purely by per-request micropayment. The response MIME type is application/json.\n\nNote that this specific endpoint (/api/v1/nfts/50/owner) is not listed on the provider's landing page among the advertised API categories, so its exact response schema and the range of supported NFT IDs are unknown. The provider's site is very thin on documentation — the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no further detail. Treat this as a functional but lightly documented endpoint.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-payment","base-network","per-request-pricing","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","token holder query","NFT metadata","x402 NFT API","Base USDC micropayment API"],"warnings":["This specific endpoint (/api/v1/nfts/50/owner) is not listed among the provider's advertised APIs on the landing page.","No request or response schema is documented anywhere; the exact input parameters and output fields are unknown.","The /api, /pricing, and /README pages contain no useful documentation — only a 'Connect wallet' prompt.","The breadth and reliability of the NFT data source behind this endpoint is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/50/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/50/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format, no examples, and the specific NFT endpoint is not even listed on the provider's own landing page. Documentation pages return only a wallet-connect 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'/api/v1/nfts/50/owner':163 '/pricing':203 '/readme':205 '0.02':11,24,76,130 '000':125 '0x8335':116 '1':95 '20':124 '2913':117 '50':41 '6':133 'Base USDC micropayment API' 'NFT metadata' 'NFT owner lookup' 'NFT ownership API' 'access':143 'advertis':142,175 'ai/ml':66 'among':173 'analyt':65 'api':57,136,176 'application/json':157 'asset':112 'base':9,22,85,119,126 'base-network' 'broader':51 'caller':98 'categori':177 'connect':211 'contract':115 'data':4,17,64,69 'decim':134 'detail':217 'document':200,225 'enabl':56 'endpoint':28,88,162,226 'equal':129 'exact':96,180 'finance/web3':68 'function':222 'gate':145 'given':37 'header':105 'id':40,189 'includ':100 'infer':67 'inform':34 'infrastructur':71 'key':137 'land':171 'light':224 'limit':140 'list':166 'lowpaymentfee.com':30 'maxamountrequir':122 'micropay':7,20,151 'mime':154 'must':99 'network':86 'nft':2,15,32,38,188 'nft-ownership-lookup' 'no-api-key' 'note':158 'offer':58 'owner':33 'ownership':3,16 'page':172,206 'part':48 'payment':92,104,109 'per':12,25,77,149 'per-request':148 'per-request-pricing' 'price':74 'probe':44 'prompt':213 'proof':110 'protocol':93 'provid':62,169,193 'pure':146 'queri':1,14 'rang':185 'rate':139 'request':13,26,78,150 'resolv':208 'respons':153,181 'return':31 'schema':182 'scheme':97 'settl':80 'site':195 'span':63 'specif':161 'suit':52 'support':187 'thin':198 'token':39 'token holder query' 'treat':218 'type':155 'unit':127 'unknown':191 'url':45 'usdc':82,114,131 'usdc-payment' 'use':89 'util':72 'valid':108 'version':94 'via':5,18 'wallet':212 'x':103 'x-payment':102 'x402':6,19,55,91 'x402 NFT API' 'x402-enabled':54 'x402-micropayment'","prices":[{"id":"b78b46cc-3b12-448d-a4bf-e1f03b20ffd1","listingId":"f2f962e8-f498-4f3d-933f-55ec72fd9a30","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/50/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":"2026-04-21T18:32:28.343Z"}],"sources":[{"listingId":"f2f962e8-f498-4f3d-933f-55ec72fd9a30","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/50/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.343Z","lastSeenAt":"2026-04-22T15:03:11.743Z"}],"details":{"listingId":"f2f962e8-f498-4f3d-933f-55ec72fd9a30","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/50/owner \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/nfts/50/owner"},{"claim":"The provider advertises $0.02 per request across all APIs with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists API categories for Data & Analytics, AI & ML, Finance & Web3, and Infrastructure, but does not list an NFT endpoint.","source_url":"https://lowpaymentfee.com"}],"useCases":["Look up the current owner of a specific NFT by token ID","Verify NFT ownership as part of a gating or verification workflow","Integrate NFT ownership checks into an automated agent pipeline using x402 payments"],"bestFor":["Agents or apps that need on-demand NFT ownership data without managing API keys","Developers building on Base who want pay-per-call NFT queries","Micropayment-native workflows where per-request billing is preferred over subscriptions"],"notFor":["Bulk or batch NFT ownership queries across thousands of tokens (no documented batch endpoint)","Users who need detailed NFT metadata beyond ownership (traits, images, history) — not documented here"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.943Z"},"updatedAt":"2026-04-22T15:03:11.743Z"}}