{"id":"99f966f0-d7a4-4396-b67e-75ad50964dd9","shortId":"9DwgK7","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 #32 via a pay-per-call x402 protocol. The endpoint accepts POST requests and is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). Each call costs a maximum of $0.02 (20,000 base units with 6 decimals). No API keys or rate limits are required — payment is handled inline via the X-PAYMENT header.\n\nThe provider (lowpaymentfee.com) hosts a broader suite of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per request. This specific endpoint focuses on NFT owner lookup. The response MIME type is application/json. The x402 challenge is live and returns a well-formed 402 response with version 1 of the protocol.\n\nDocumentation is minimal — the site's /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema beyond the output schema stub in the 402 challenge, and no example payloads. The actual data returned by the endpoint (NFT owner address, metadata, etc.) is not documented.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","base-network","usdc-settlement","pay-per-request","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC micropayment API","on-chain NFT data","token owner query","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request and response formats are undocumented.","The endpoint path is hardcoded to NFT #32; it is unclear whether other NFT IDs are supported or how to parameterize.","Site documentation pages (/api, /pricing, /README) return only a wallet-connect prompt with no useful content.","The provider lists many other API endpoints on the landing page but none have detailed docs; the platform may be experimental or early-stage."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/32/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/32/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts payment on Base in USDC at $0.02. However, there is no OpenAPI spec, no documented request body schema, no example responses, and the site's documentation pages are empty wallet-connect prompts. The actual data returned is 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'/pricing':162 '/readme':164 '0.02':11,24,68,119 '000':70 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':61 '1':151 '20':69 '32':37 '402':147,194 '6':74 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':48 'actual':201 'addit':176 'address':209 'ai/ml':109 'analyt':108 'api':77,105 'application/json':135 'base':9,22,56,71 'base-network' 'beyond':187 'broader':99 'call':43,63 'challeng':138,195 'connect':172 'contract':60 'cost':64 'data':4,17,107,112,202 'decim':75 'detail':178 'document':155,214 'endpoint':28,47,124,206 'etc':211 'exampl':198 'finance/web3':111 'focus':125 'form':146 'gate':104 'handl':86 'header':93 'host':97 'infer':110 'inform':34 'infrastructur':114 'inlin':87 'json-response' 'key':78 'limit':81 'live':140 'lookup':129 'lowpaymentfee' 'lowpaymentfee.com':30,96 'maximum':66 'metadata':210 'micropay':7,20 'mime':132 'minim':157 'network':57 'nft':2,15,32,36,127,207 'nft-ownership-lookup' 'no-api-key' 'on-chain NFT data' 'openapi':182 'output':189 'owner':128,208 'ownership':3,16,33 'page':165 'pay':41 'pay-per-cal':40 'pay-per-request' 'payload':199 'payment':84,92 'per':12,25,42,120 'post':49 'price':117 'prompt':173 'protocol':45,154 'provid':95 'queri':1,14 'rate':80 'request':13,26,50,121 'request/response':185 'requir':83 'resolv':167 'respons':131,148 'return':31,142,203 'schema':186,190 'settl':53 'site':159 'span':106 'spec':183 'specif':123 'stub':191 'suit':100 'technic':177 'token owner query' 'type':133 'unit':72 'usdc':59 'usdc-settlement' 'use':58 'util':115 'version':150 'via':5,18,38,88 'wallet':171 'wallet-connect':170 'well':145 'well-form':144 'x':91 'x-payment':90 'x402':6,19,44,103,137 'x402 NFT endpoint' 'x402-gated':102 'x402-micropayment'","prices":[{"id":"569922cf-4805-48ee-bea6-f8cb7641194a","listingId":"99f966f0-d7a4-4396-b67e-75ad50964dd9","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/32/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":"2026-04-21T18:32:27.959Z"}],"sources":[{"listingId":"99f966f0-d7a4-4396-b67e-75ad50964dd9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/32/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.959Z","lastSeenAt":"2026-04-22T18:33:27.491Z"}],"details":{"listingId":"99f966f0-d7a4-4396-b67e-75ad50964dd9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/32/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 x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units.","source_url":"https://lowpaymentfee.com/api/v1/nfts/32/owner"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/nfts/32/owner"},{"claim":"All APIs on the platform 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 provider offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Looking up the current owner of a specific NFT programmatically","Verifying NFT ownership as part of a gating or access-control workflow","Integrating NFT ownership checks into an agent pipeline with automatic micropayments"],"bestFor":["Agents or bots that need on-demand NFT ownership data without managing API keys","Developers prototyping x402 payment flows on Base","Low-volume, pay-as-you-go NFT data queries"],"notFor":["Bulk or batch NFT ownership queries across many token IDs (only NFT #32 path is documented)","Users who need detailed NFT metadata, transaction history, or collection-level analytics","Anyone without a Base-compatible USDC wallet for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.566Z"},"updatedAt":"2026-04-22T18:33:27.491Z"}}