{"id":"f6c95830-9b10-466d-ae4d-c286da1fd004","shortId":"VsEq6U","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 #72. It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/nfts/72/owner` accepts POST requests and is gated behind an x402 payment challenge. The maximum amount required per call is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 USD (USDC uses 6 decimals). No API keys or rate limits are advertised; access is granted instantly upon payment. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.\n\nThe platform markets itself as a low-fee, no-commitment API marketplace. However, documentation is extremely sparse — there is no OpenAPI spec, no request/response schema beyond the x402 challenge's `outputSchema` stub, and the crawled pages beyond the landing page only show a \"Connect wallet\" prompt. The actual response format for this NFT owner lookup is unknown, so consumers should expect to discover the schema experimentally.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-payment","base-network","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner query","NFT holder lookup","token ownership API","NFT metadata","on-chain NFT data","x402 NFT API","Base USDC API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are undocumented.","The endpoint path suggests a hardcoded NFT ID (72); it is unclear whether other NFT IDs are supported or how to query them.","Crawled subpages (/api, /pricing, /README) returned only 'Connect wallet' with no useful content.","Response content type and structure must be discovered experimentally."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/72/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/72/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 confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request body schema, no example responses, and no documentation beyond a landing page listing. The actual data returned is unknown, making this effectively a stub 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'0.02':11,24,105 '000':94 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':131 '0x8335':99 '20':93 '2913':100 '300':136 '6':109 '72':37 'Base USDC API' 'NFT holder lookup' 'NFT metadata' 'NFT owner query' 'accept':75 'access':119 'across':51 'actual':187 'address':130 'advertis':118 'ai/ml':54 'amount':88 'analyt':53 'api':50,112,150 'base':9,22,67,95,102 'base-network' 'behind':81 'beyond':165,176 'broader':43 'call':49,91 'categori':58 'challeng':85,168 'commit':149 'connect':183 'consum':198 'crawl':174 'data':4,17,52 'decim':110 'discov':202 'document':153 'endpoint':28,73 'equal':104 'expect':200 'experiment':205 'extrem':155 'fee':146 'finance/web3':55 'format':189 'gate':80 'grant':121 'howev':152 'inform':34 'infrastructur':57 'instant':122 'key':113 'land':178 'limit':116 'lookup':194 'low':145 'low-fe':144 'lowpaymentfee.com':30 'market':140 'marketplac':151 'maximum':87 'micropay':7,20 'network':68 'nft':2,15,32,36,192 'nft-ownership-lookup' 'no-api-key' 'no-commit':147 'offer':45 'on-chain NFT data' 'openapi':160 'outputschema':170 'owner':193 'ownership':3,16,33 'page':175,179 'part':40 'pay':47 'pay-per-cal':46 'pay-per-request' 'payment':84,124,126 'per':12,25,48,90 'platform':44,139 'post':76 'prompt':185 'protocol':64 'queri':1,14 'rate':115 'request':13,26,77 'request/response':163 'requir':89 'respons':188 'return':31 'schema':164,204 'second':137 'sent':128 'settl':60 'show':181 'spars':156 'spec':161 'specif':72 'stub':171 'timeout':134 'token ownership API' 'unit':96 'unknown':196 'upon':123 'usd':106 'usdc':70,98,107 'usdc-payment' 'use':69,108 'via':5,18,61 'wallet':184 'x402':6,19,63,83,167 'x402 NFT API' 'x402-micropayment'","prices":[{"id":"0d60535a-0727-4c38-b187-1607c3e0f0cf","listingId":"f6c95830-9b10-466d-ae4d-c286da1fd004","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/72/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":"2026-04-21T18:32:32.668Z"}],"sources":[{"listingId":"f6c95830-9b10-466d-ae4d-c286da1fd004","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/72/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.668Z","lastSeenAt":"2026-04-22T07:32:40.933Z"}],"details":{"listingId":"f6c95830-9b10-466d-ae4d-c286da1fd004","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/72/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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/72/owner"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/72/owner"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300 second timeout","source_url":"https://lowpaymentfee.com/api/v1/nfts/72/owner"}],"useCases":["Querying the current owner of a specific NFT programmatically","Verifying NFT ownership as part of a gating or access-control workflow","Building dashboards that display NFT holder information"],"bestFor":["Agents or apps that need on-demand NFT ownership data without managing API keys","Developers experimenting with x402 pay-per-call patterns on Base","Lightweight, low-cost one-off NFT ownership checks"],"notFor":["Bulk or batch NFT ownership queries across large collections (no batch endpoint documented)","Use cases requiring detailed NFT metadata beyond ownership (traits, images, history)","Users who cannot settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.613Z"},"updatedAt":"2026-04-22T07:32:40.933Z"}}