{"id":"2bfc6836-9fd6-4f7c-b327-cec7e52f3d7a","shortId":"ucNcmY","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 #28. 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/28/owner` accepts POST requests and is gated by an x402 payment challenge. The price is 20,000 base units of USDC (which uses 6 decimals), equating to $0.02 per request. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC at contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base. No API keys or rate limits are advertised; access is instant once payment is included in the `X-PAYMENT` header.\n\nDocumentation is minimal — the site lists many endpoints but provides no request/response schemas, parameter descriptions, or usage examples beyond the endpoint URLs and pricing. The NFT endpoint path suggests it returns the current owner of a specific NFT (ID 28), but the exact response format is not documented. The platform appears to be a demonstration or early-stage service showcasing low-fee x402 micropayments.","tags":[],"capabilities":["nft-ownership-query","x402-payment","usdc-settlement","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","NFT holder query","pay-per-call NFT API"],"warnings":["No request or response schema documented — response format is unknown","Endpoint path is hardcoded to NFT ID 28; unclear if other NFT IDs are queryable","No OpenAPI spec, README, or detailed docs available on the site","Platform appears to be early-stage or a demo; many listed endpoints may not be fully functional"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/28/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/28/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 challenge with clear pricing, but there is no documentation of request parameters, response schema, or examples. The NFT endpoint path is specific (NFT #28) with no indication of how to query other NFTs. Effectively a stub 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'0.02':11,24,101 '000':90 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':109 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':114 '20':89 '28':37,177 '6':97 'Base USDC micropayment API' 'NFT holder query' 'NFT owner lookup' 'NFT ownership API' 'accept':75 'access':125 'across':51 'address':108 'advertis':124 'ai/ml':54 'analyt':53 'api':50,118 'appear':188 'base':9,22,67,91,116 'base-network' 'beyond':156 'broader':43 'categori':58 'challeng':85 'contract':113 'current':170 'data':4,17,52 'decim':98 'demonstr':192 'descript':152 'document':138,185 'earli':195 'early-stag':194 'endpoint':28,73,145,158,164 'equat':99 'exact':180 'exampl':155 'fee':201 'finance/web3':55 'format':182 'gate':80 'header':137 'id':176 'includ':131 'inform':34 'infrastructur':57 'instant':127 'key':119 'limit':122 'list':143 'low':200 'low-fe':199 'lowpaymentfee.com':30 'made':106 'mani':144 'micropay':7,20,203 'minim':140 'network':68 'nft':2,15,32,36,163,175 'nft-ownership-query' 'no-api-key' 'offer':45 'owner':171 'ownership':3,16,33 'paramet':151 'part':40 'path':165 'pay':47 'pay-per-call NFT API' 'pay-per-request':46 'payment':84,104,129,136 'per':12,25,48,102 'platform':44,187 'post':76 'price':87,161 'protocol':64 'provid':147 'queri':1,14 'rate':121 'request':13,26,49,77,103 'request/response':149 'respons':181 'return':31,168 'schema':150 'servic':197 'settl':60 'showcas':198 'site':142 'specif':72,174 'stage':196 'suggest':166 'unit':92 'url':159 'usag':154 'usdc':70,94,111 'usdc-settlement' 'use':69,96,110 'via':5,18,61 'x':135 'x-payment':134 'x402':6,19,63,83,202 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"2fcd2237-3d14-4a53-af77-80ce0e8f1e35","listingId":"2bfc6836-9fd6-4f7c-b327-cec7e52f3d7a","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/28/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":"2bfc6836-9fd6-4f7c-b327-cec7e52f3d7a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/28/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.959Z","lastSeenAt":"2026-04-22T18:33:27.492Z"}],"details":{"listingId":"2bfc6836-9fd6-4f7c-b327-cec7e52f3d7a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/28/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 HTTP 402 with an x402 challenge requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/28/owner"},{"claim":"Price is $0.02 per request across all listed endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/28/owner"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"}],"useCases":["Looking up the current owner of a specific NFT programmatically","Integrating NFT ownership checks into agent workflows without API key management","Demonstrating x402 micropayment protocol usage on Base"],"bestFor":["Agents needing on-demand NFT ownership data without subscription commitments","Developers experimenting with x402 payment-gated APIs","Low-volume NFT ownership queries at $0.02 per call"],"notFor":["Bulk or high-volume NFT ownership lookups across many token IDs","Querying NFTs on chains other than what this endpoint covers","Applications requiring detailed NFT metadata beyond ownership"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.566Z"},"updatedAt":"2026-04-22T18:33:27.492Z"}}