{"id":"b04b9a47-cba2-4c55-8f92-d43daece3a84","shortId":"8tFjhJ","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 ID 41. 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 endpoint accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact-amount scheme. 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, rate limits, or upfront commitments are required — callers simply attach a valid x402 payment header to each request.\n\nThe platform advertises a uniform $0.02/request pricing model across all its endpoints. This specific endpoint is scoped to NFT owner lookups, though the provider's landing page lists additional endpoints for sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no further technical detail.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-payment","base-network","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC micropayment API","on-chain NFT data","token owner query"],"warnings":["No API documentation available — /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no technical content.","No request body schema or response schema documented; callers must discover the interface by experimentation.","The endpoint is narrowly scoped to NFT ID 41; it is unclear whether other NFT IDs are supported at different paths."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/41/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/41/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 (402 challenge captured) with clear pricing ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The specific behavior and response format of the NFT owner endpoint must be inferred from the URL path 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'/pricing':196 '/readme':198 '/request':149 '0.02':11,24,116,148 '000':105 '0x8335':110 '20':104 '2913':111 '41':38 '6':120 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':74 'across':52,152 'addit':172 'advertis':145 'ai/ml':55 'amount':95,99 'analysi':176 'analyt':54 'api':51,123 'attach':134 'base':9,22,68,106,113 'base-network' 'beyond':188 'broader':44 'call':50,102 'caller':132 'categori':59 'commit':129 'connect':205 'data':4,17,53 'decim':121 'detail':212 'document':187 'embed':179 'endpoint':28,73,155,158,173 'equal':115 'estim':183 'exact':94 'exact-amount':93 'feed':181 'finance/web3':56 'gas':182 'geocod':184 'handl':82 'header':89,139 'id':37 'inform':34 'infrastructur':58 'inlin':83 'json':79 'key':124 'land':169,190 'limit':126 'list':171 'lookup':164 'lowpaymentfee.com':30 'maximum':98 'micropay':7,20 'minim':204 'model':151 'network':69 'nft':2,15,32,36,162 'nft-ownership-lookup' 'no-api-key' 'offer':46 'on-chain NFT data' 'owner':163 'ownership':3,16,33 'page':170,191,199 'part':41 'pay':48 'pay-per-cal':47 'pay-per-request' 'payment':80,88,138 'per':12,25,49,101 'platform':45,144 'post':75 'price':150,180 'prompt':207 'protocol':65 'provid':167 'queri':1,14 'rate':125 'request':13,26,76,142 'requir':100,131 'resolv':201 'return':31,78 'scheme':96 'scope':160 'sentiment':175 'settl':61 'simpli':133 'spars':193 'specif':157 'summar':178 'technic':211 'text':177 'though':165 'token owner query' 'uniform':147 'unit':107 'upfront':128 'usd':117 'usdc':71,109,118 'usdc-payment' 'use':70,90,119 'valid':136 'via':5,18,62,84 'wallet':206 'x':87 'x-payment':86 'x402':6,19,64,92,137 'x402 NFT endpoint' 'x402-micropayment'","prices":[{"id":"782c2e05-dc6f-417b-9e82-4f471351a1ad","listingId":"b04b9a47-cba2-4c55-8f92-d43daece3a84","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/41/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":"2026-04-21T18:32:28.285Z"}],"sources":[{"listingId":"b04b9a47-cba2-4c55-8f92-d43daece3a84","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/41/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.285Z","lastSeenAt":"2026-04-22T16:32:58.897Z"}],"details":{"listingId":"b04b9a47-cba2-4c55-8f92-d43daece3a84","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/41/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/41/owner"},{"claim":"The platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/nfts/41/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 or bots that track NFT ownership changes"],"bestFor":["Agents or apps that need quick, keyless NFT owner lookups","Developers who prefer pay-per-call over subscription API plans","x402-compatible wallets and agent frameworks on Base"],"notFor":["Bulk enumeration of all NFT owners across a collection (single-ID endpoint)","Users who need detailed NFT metadata beyond ownership","Anyone without a Base-compatible USDC wallet for x402 payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.061Z"},"updatedAt":"2026-04-22T16:32:58.897Z"}}