{"id":"45906a30-54c3-48c2-a922-263e995f70b2","shortId":"Jgw6fq","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 the owner of NFT #61 via a pay-per-call x402 protocol. The payment is settled on the Base network using USDC (contract 0x8335…2913). Each request costs a maximum of 20,000 base units of USDC, which at 6 decimals equals $0.02. No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider's landing page advertises a broad suite of APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per request on the Base network. This specific endpoint (/api/v1/nfts/61/owner) falls under what appears to be an NFT data category, returning ownership information for a specific NFT. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is minimal — the site offers no OpenAPI spec, no detailed request/response schemas, and the /api, /pricing, and /README pages all resolve to a bare \"Connect wallet\" prompt. The actual response format for this NFT owner endpoint is unknown beyond the declared MIME type. Callers should expect a JSON object containing an owner address, but the exact shape is unverified.","tags":[],"capabilities":["x402-payment","nft-ownership-lookup","base-network","usdc-settlement","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC micropayment API","pay-per-call NFT data","token owner query"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown beyond MIME type application/json.","The endpoint path is hardcoded to NFT ID 61; it is unclear whether other NFT IDs are supported via similar paths.","The /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no useful documentation.","The provider lists many API categories on the landing page but none appear to include an explicit NFT section — this endpoint's purpose is inferred from the URL path alone."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/61/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/61/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 and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI spec, no documented request/response schema, no examples, and the broader site pages are empty beyond a wallet connect prompt. The specific functionality (NFT #61 owner) is narrow and 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'/api/v1/nfts/61/owner':133 '/pricing':175 '/readme':177 '0.02':11,24,75,123 '000':65 '0x8335':56 '20':64 '2913':57 '6':72 '61':36 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':153 'actual':188 'address':212 'advertis':104 'ai/ml':113 'analyt':112 'api':77,109 'appear':137 'application/json':158 'attach':87 'bare':183 'base':9,22,51,66,128 'base-network' 'beyond':198 'broad':106 'call':42 'caller':85,203 'categori':143 'connect':184 'contain':209 'contract':55 'cost':60 'data':4,17,111,116,142 'decim':73 'declar':200 'detail':169 'document':159 'endpoint':28,132,152,195 'equal':74 'exact':215 'expect':205 'fall':134 'finance/web3':115 'format':190 'header':92 'infer':114 'inform':146 'infrastructur':118 'json':207 'key':78 'land':102 'limit':80 'lowpaymentfee.com':30 'maximum':62 'micropay':7,20 'mime':201 'minim':161 'network':52,129 'nft':2,15,35,141,150,193 'nft-ownership-lookup' 'no-api-key' 'object':208 'offer':164 'openapi':166 'owner':33,194,211 'ownership':3,16,145 'page':103,178 'pay':40 'pay-per-cal':39 'pay-per-call NFT data' 'pay-per-request' 'payment':46,91,97 'per':12,25,41,124 'post':154 'price':121 'prompt':186 'proof':98 'protocol':44 'provid':100 'queri':1,14 'rate':79 'request':13,26,59,125,155 'request/response':170 'requir':84 'resolv':180 'respons':189 'return':31,144,157 'schema':171 'settl':48 'shape':216 'simpli':86 'site':163 'span':110 'spec':167 'specif':131,149 'subscript':82 'suit':107 'token owner query' 'type':202 'unit':67 'unknown':197 'unverifi':218 'usdc':54,69 'usdc-settlement' 'use':53 'util':119 'valid':95 'via':5,18,37 'wallet':185 'x':90 'x-payment':89 'x402':6,19,43,96 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"3e144e1c-3701-4686-8d68-a415acde0142","listingId":"45906a30-54c3-48c2-a922-263e995f70b2","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/61/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":"2026-04-21T18:32:28.391Z"}],"sources":[{"listingId":"45906a30-54c3-48c2-a922-263e995f70b2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/61/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.391Z","lastSeenAt":"2026-04-22T15:03:11.820Z"}],"details":{"listingId":"45906a30-54c3-48c2-a922-263e995f70b2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/61/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":"Endpoint returns HTTP 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/61/owner"},{"claim":"Max amount required is 20000 base units of USDC (6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/nfts/61/owner"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/61/owner"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/api, /pricing, /README) contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/api"}],"useCases":["Querying the current owner of a specific NFT without needing an API key","Integrating NFT ownership checks into agent workflows with automatic micropayments","Verifying NFT provenance or ownership in a Web3 application"],"bestFor":["AI agents that need on-demand NFT ownership data with no subscription","Developers prototyping x402 payment flows on Base","Low-volume NFT data lookups where per-call pricing is preferable to a subscription"],"notFor":["High-volume NFT indexing across many collections (no bulk/batch endpoint documented)","Querying NFTs beyond ID 61 on this specific endpoint (path is hardcoded to NFT 61)","Users who need detailed NFT metadata beyond ownership"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.819Z"},"updatedAt":"2026-04-22T15:03:11.820Z"}}