{"id":"dda8322f-75fc-43b6-8969-d3a64944c533","shortId":"kBkZRL","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 #58 via a pay-per-call x402 protocol. The endpoint accepts POST requests and is settled 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 provider (lowpaymentfee.com) hosts a broader suite of x402-gated APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced at $0.02 per request on the Base network. This specific endpoint sits under the NFT category and returns the owner of a given NFT (ID 58 in this case). The response MIME type is application/json.\n\nDocumentation is minimal — the site's landing page lists available endpoints and pricing, but there is no OpenAPI spec, no detailed request/response schema, and no usage examples. The endpoint is confirmed live (HTTP 402 challenge returned successfully), but the actual response payload structure is unknown beyond the declared application/json MIME type.","tags":[],"capabilities":["nft-ownership-query","x402-micropayment","usdc-settlement","base-network","pay-per-call","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 holder query"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown beyond MIME type application/json.","The endpoint is hardcoded to NFT ID 58; it is unclear whether other NFT IDs are supported via path parameterization.","No detailed docs, README, or examples were found on the site (pages returned only 'Connect wallet').","The provider site lists many API categories but the actual functionality behind each endpoint is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/58/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/58/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema documentation, no usage examples, and the endpoint description is generic ('Premium API Access'). The actual response format is entirely 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'000':68 '20':67 '402':193 '58':37,150 '6':73 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':48 'actual':199 'advertis':63 'ai/ml':117 'analyt':116 'api':81,113 'application/json':159,208 'attach':90 'avail':169 'base':9,22,58,69,131 'base-network' 'beyond':205 'broader':107 'call':43 'caller':88 'case':153 'categori':140 'challeng':62,194 'confirm':190 'data':4,17,115 'decim':74 'declar':207 'detail':180 'document':160 'endpoint':28,47,135,170,188 'equal':76 'exampl':186 'finance/web3':119 'gate':112 'given':147 'header':95 'host':105 'http':192 'id':149 'infer':118 'inform':34 'infrastructur':121 'json-response' 'key':82 'land':166 'limit':85 'list':168 'live':191 'lowpaymentfee.com':30,104 'maxamountrequir':65 'micropay':7,20 'mime':156,209 'minim':162 'network':59,132 'nft':2,15,32,36,139,148 'nft-ownership-query' 'no-api-key' 'on-chain NFT data' 'openapi':177 'owner':144 'ownership':3,16,33 'page':167 'pay':41 'pay-per-cal':40 'pay-per-call' 'payload':201 'payment':94,100 'per':12,25,42,78,127 'post':49 'price':124,172 'proof':101 'protocol':45 'provid':103 'queri':1,14 'rate':84 'request':13,26,50,79,128 'request/response':181 'requir':87 'respons':155,200 'return':31,142,195 'schema':182 'settl':53 'simpli':89 'sit':136 'site':164 'span':114 'spec':178 'specif':134 'structur':202 'success':196 'suit':108 'token holder query' 'type':157,210 'unit':70 'unknown':204 'usag':185 'usdc':55,72 'usdc-settlement' 'util':122 'valid':98 'via':5,18,38 'x':93 'x-payment':92 'x402':6,19,44,61,99,111 'x402 NFT endpoint' 'x402-gated':110 'x402-micropayment'","prices":[{"id":"50459db3-68a6-43a3-a6d3-4f28a05d4878","listingId":"dda8322f-75fc-43b6-8969-d3a64944c533","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/58/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":"2026-04-21T18:32:28.397Z"}],"sources":[{"listingId":"dda8322f-75fc-43b6-8969-d3a64944c533","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/58/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.397Z","lastSeenAt":"2026-04-22T15:03:11.851Z"}],"details":{"listingId":"dda8322f-75fc-43b6-8969-d3a64944c533","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/58/owner \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on the Base network.","source_url":"https://lowpaymentfee.com/api/v1/nfts/58/owner"},{"claim":"All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/nfts/58/owner"}],"useCases":["Querying the current owner of a specific NFT programmatically","Building NFT portfolio trackers that need ownership verification","Agent-driven workflows that need to verify NFT holders before executing downstream logic"],"bestFor":["Agents needing simple NFT ownership checks without API key management","Micropayment-based access to NFT metadata","Low-friction, pay-as-you-go NFT data queries on Base"],"notFor":["Bulk NFT enumeration or collection-wide ownership scans (single-NFT endpoint)","Users who need free or subscription-based NFT data APIs","Querying NFTs on networks other than Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.817Z"},"updatedAt":"2026-04-22T15:03:11.851Z"}}