{"id":"09779bfa-6ffd-4107-9522-399318a5d9c0","shortId":"YXyRNj","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 #48. It is part of a broader platform offering pay-per-request 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/48/owner` accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact scheme. The maximum amount required is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). There are no API keys, no rate limits, and no upfront commitments — each call is individually paid at the time of request.\n\nThe platform advertises a uniform $0.02 per request pricing across all its endpoints. The x402 challenge confirms the endpoint is live, returning a proper 402 Payment Required response with a well-formed accepts array. No OpenAPI schema or detailed documentation was found beyond the landing page listing, so the exact request body format and response structure for this NFT owner endpoint are not documented in the crawled material.","tags":[],"capabilities":["nft-ownership-query","x402-micropayment","usdc-payment","base-network","pay-per-request","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","token holder query","x402 NFT API","Base USDC micropayment API","on-chain NFT data"],"warnings":["No OpenAPI or detailed API documentation found for this endpoint","Request body schema and response format are undocumented — callers must guess or experiment","Endpoint is hardcoded to NFT #48; unclear if other NFT IDs are supported at different paths","The broader platform lists many API categories but none appear to be NFT-specific on the landing page, making this endpoint's purpose somewhat opaque"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/48/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/48/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge with clear pricing and payment details. However, there is no OpenAPI schema, no documented request/response format for this specific NFT endpoint, and the crawled pages beyond the landing page returned only wallet-connect stubs. The endpoint path is narrowly scoped to a single NFT 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'0.02':11,24,107,141 '000':102 '20':101 '402':160 '48':37 '6':112 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':75,169 'across':51,145 'advertis':138 'ai/ml':54 'amount':98 'analyt':53 'api':50,117 'array':170 'base':9,22,67,103 'base-network' 'beyond':179 'bodi':188 'broader':43 'call':127 'categori':58 'challeng':151 'commit':125 'confirm':152 'crawl':203 'data':4,17,52 'decim':113 'detail':175 'document':176,200 'endpoint':28,73,148,154,197 'exact':94,186 'finance/web3':55 'form':168 'format':189 'found':178 'handl':83 'header':90 'individu':129 'inform':34 'infrastructur':57 'inlin':84 'json':80 'json-response' 'key':118 'land':181 'limit':121 'list':183 'live':156 'lowpaymentfee.com':30 'materi':204 'maximum':97 'micropay':7,20 'network':68 'nft':2,15,32,36,195 'nft-ownership-query' 'no-api-key' 'offer':45 'on-chain NFT data' 'openapi':172 'owner':196 'ownership':3,16,33 'page':182 'paid':130 'part':40 'pay':47 'pay-per-request':46 'payment':81,89,161 'per':12,25,48,142 'platform':44,137 'post':76 'price':144 'proper':159 'protocol':64 'queri':1,14 'rate':120 'request':13,26,49,77,135,143,187 'requir':99,162 'respons':163,191 'return':31,79,157 'schema':173 'scheme':95 'settl':60 'sinc':109 'specif':72 'structur':192 'time':133 'token holder query' 'uniform':140 'unit':104 'upfront':124 'usd':108 'usdc':70,106,110 'usdc-payment' 'use':69,91,111 'via':5,18,61,85 'well':167 'well-form':166 'x':88 'x-payment':87 'x402':6,19,63,93,150 'x402 NFT API' 'x402-micropayment'","prices":[{"id":"650b01f8-1822-4c53-880b-4a6d1c5a5435","listingId":"09779bfa-6ffd-4107-9522-399318a5d9c0","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/48/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":"2026-04-21T18:32:32.873Z"}],"sources":[{"listingId":"09779bfa-6ffd-4107-9522-399318a5d9c0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/48/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.873Z","lastSeenAt":"2026-04-22T05:32:24.115Z"}],"details":{"listingId":"09779bfa-6ffd-4107-9522-399318a5d9c0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/48/owner \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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/48/owner"},{"claim":"The platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/48/owner"}],"useCases":["Looking up the current owner of a specific NFT programmatically","Integrating NFT ownership checks into automated agent workflows","Verifying NFT holder status without running your own indexer"],"bestFor":["AI agents needing on-demand NFT ownership data with no signup","Developers prototyping NFT-aware applications with minimal friction","Micropayment-based access to blockchain data without API keys"],"notFor":["Bulk querying ownership across thousands of NFTs (no batch endpoint documented)","Querying NFTs beyond the specific token ID 48 (endpoint is scoped to a single NFT)","Users who need free or subscription-based access rather than per-call payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.239Z"},"updatedAt":"2026-04-22T05:32:24.115Z"}}