{"id":"bc5e81e9-43c2-4a2c-9266-fd901b97577d","shortId":"zzzAc9","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 #73 via a pay-per-call x402 protocol. The service accepts POST requests and settles payments 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 or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform offers a suite of x402-gated APIs 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 listed at $0.02 per request with the same pay-as-you-go model on Base.\n\nThis specific endpoint (/api/v1/nfts/73/owner) is narrowly scoped to returning NFT ownership information. The response MIME type is application/json. No OpenAPI schema or detailed documentation beyond the landing page listing was found, so the exact request body format and response structure are not documented. The endpoint is live and returns a proper 402 challenge when called without payment.","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","who owns NFT","token holder query","ERC-721 owner","Base USDC micropayment API","x402 NFT endpoint"],"warnings":["No OpenAPI or detailed documentation available for this endpoint","The specific /api/v1/nfts/73/owner path is not listed on the provider's landing page — only broader API categories are shown","Request body schema and response schema are unknown; no examples found","The endpoint appears hardcoded to NFT ID 73 — unclear if other IDs are supported via different paths"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/73/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/73/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, but there is no OpenAPI schema, no documented request/response format, and no example payloads. The NFT endpoint path is not even listed on the provider's landing page (only generic categories are shown). Effectively a stub with confirmed 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'0.02':11,24,76,145 '000':67 '20':66 '402':210 '6':72 '73':36 'Base USDC micropayment API' 'ERC-721 owner' 'NFT owner lookup' 'NFT ownership API' 'accept':47 'advertis':62 'ai/ml':116 'analysi':119 'analyt':115 'api':80,112 'application/json':176 'attach':89 'base':9,22,57,68,158 'base-network' 'beyond':183 'bodi':194 'broader':102 'call':42,213 'caller':87 'challeng':61,211 'classif':121 'convers':138 'data':4,17,114,124 'decim':73 'detail':181 'document':182,201 'embed':122 'endpoint':28,141,161,203 'equal':75 'estim':132 'exact':192 'exchang':127 'feed':126 'finance/web3':123 'format':195 'found':189 'gas':131 'gate':111 'generat':139 'geocod':136 'go':155 'header':94 'infer':117 'inform':170 'infrastructur':134 'json-response' 'key':81 'land':185 'limit':84 'list':143,187 'live':205 'lowpaymentfee.com':30,103 'maxamountrequir':64 'micropay':7,20 'mime':173 'model':156 'narrowli':164 'network':58 'nft':2,15,35,168 'nft-ownership-lookup' 'no-api-key' 'offer':105 'openapi':178 'owner':33 'ownership':3,16,169 'page':186 'pay':40,152 'pay-as-you-go':151 'pay-per-cal':39 'pay-per-call' 'payment':52,93,99,215 'per':12,25,41,77,146 'platform':104 'post':48 'price':125 'proof':100 'proper':209 'protocol':44 'queri':1,14 'quot':130 'rate':83,128 'request':13,26,49,78,147,193 'requir':86 'respons':172,197 'return':31,167,207 'schema':179 'scope':165 'sentiment':118 'servic':46 'settl':51 'simpli':88 'span':113 'specif':160 'structur':198 'suit':107 'summar':120 'token':129 'token holder query' 'type':174 'unit':69 'usdc':54,71 'usdc-settlement' 'util':135 'valid':97,137 'via':5,18,37 'who owns NFT' 'without':214 'x':92 'x-payment':91 'x402':6,19,43,60,98,110 'x402 NFT endpoint' 'x402-gated':109 'x402-micropayment'","prices":[{"id":"6bfbf298-87da-4c0d-b491-61e80271f44d","listingId":"bc5e81e9-43c2-4a2c-9266-fd901b97577d","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/73/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":"2026-04-21T18:32:28.655Z"}],"sources":[{"listingId":"bc5e81e9-43c2-4a2c-9266-fd901b97577d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/73/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.655Z","lastSeenAt":"2026-04-22T13:32:33.943Z"}],"details":{"listingId":"bc5e81e9-43c2-4a2c-9266-fd901b97577d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/73/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 advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/73/owner"},{"claim":"All endpoints on lowpaymentfee.com 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 APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/73/owner"}],"useCases":["Querying the current owner of a specific NFT programmatically","Integrating NFT ownership checks into agent workflows without API key management","Building on-chain data dashboards that verify NFT holders"],"bestFor":["Agents needing quick NFT ownership lookups with crypto micropayments","Developers who want keyless, pay-per-call NFT data access","Workflows on Base network that already hold USDC"],"notFor":["Bulk enumeration of all NFT owners across a collection (single-NFT endpoint)","Users who need free or fiat-settled NFT data APIs","Querying NFTs on networks other than what this provider covers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.305Z"},"updatedAt":"2026-04-22T13:32:33.943Z"}}