{"id":"f8e524b4-0cc8-4acc-b002-150a27582815","shortId":"qn6bx8","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 #51 via a pay-per-call x402 protocol. The endpoint accepts POST requests and is settled on the Base network using USDC (contract 0x8335…2913). Each call costs a maximum of 0.02 USDC (20,000 base units with 6 decimals). 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 site advertises a broad catalog of endpoints 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 (/api/v1/nfts/51/owner) appears to be an NFT-related query returning ownership information in JSON format. The response schema is not documented, so the exact shape of the returned data must be inferred from usage.\n\nBecause the provider offers no OpenAPI spec, no detailed documentation, and no example responses, the actual behavior and data quality of this endpoint remain unverified beyond the live 402 challenge. The site's /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["nft-ownership-query","x402-micropayment","base-network","usdc-settlement","pay-per-call","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","token holder query","ERC-721 owner","NFT metadata","Base USDC micropayment API","x402 NFT endpoint"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","Provider documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content","The specific NFT collection and chain source for NFT #51 are not documented","Cannot verify data accuracy or freshness of ownership information"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/51/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/51/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no documented request/response schema, no example responses, and the site's documentation pages are empty. The endpoint's actual data source and reliability are 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'/api/v1/nfts/51/owner':132 '/pricing':200 '/readme':202 '0.02':11,24,68,122 '000':71 '0x8335':60 '20':70 '2913':61 '402':194 '51':36 '6':75 'Base USDC micropayment API' 'ERC-721 owner' 'NFT metadata' 'NFT owner lookup' 'NFT ownership API' 'accept':47 'actual':181 'addit':214 'advertis':104 'ai/ml':113 'analyt':112 'api':78 'appear':133 'attach':88 'base':9,22,55,72,127 'base-network' 'behavior':182 'beyond':191 'broad':106 'call':42,63 'caller':86 'catalog':107 'challeng':195 'connect':209 'content':215 'contract':59 'cost':64 'data':4,17,111,160,184 'decim':76 'detail':174 'document':152,175 'endpoint':28,46,109,131,188 'exact':155 'exampl':178 'finance/web3':115 'format':146 'header':93 'infer':114,163 'inform':143 'infrastructur':117 'json':145 'key':79 'limit':81 'live':193 'lowpaymentfee.com':30 'maximum':66 'micropay':7,20 'minim':208 'must':161 'network':56,128 'nft':2,15,35,138 'nft-ownership-query' 'nft-relat':137 'no-api-key' 'offer':169 'openapi':171 'owner':33 'ownership':3,16,142 'page':203 'pay':40 'pay-per-cal':39 'pay-per-call' 'payment':92,98 'per':12,25,41,123 'post':48 'price':120 'prompt':211 'proof':99 'protocol':44 'provid':101,168 'qualiti':185 'queri':1,14,140 'rate':80 'relat':139 'remain':189 'request':13,26,49,124 'requir':85 'resolv':205 'respons':148,179 'return':31,141,159 'schema':149 'settl':52 'shape':156 'simpli':87 'site':103,197 'span':110 'spec':172 'specif':130 'subscript':83 'token holder query' 'unit':73 'unverifi':190 'usag':165 'usdc':58,69 'usdc-settlement' 'use':57 'util':118 'valid':96 'via':5,18,37 'wallet':210 'x':91 'x-payment':90 'x402':6,19,43,97 'x402 NFT endpoint' 'x402-micropayment'","prices":[{"id":"daaa3678-310a-454c-9414-72efc5022ec9","listingId":"f8e524b4-0cc8-4acc-b002-150a27582815","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/51/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":"2026-04-21T18:32:28.494Z"}],"sources":[{"listingId":"f8e524b4-0cc8-4acc-b002-150a27582815","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/51/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.494Z","lastSeenAt":"2026-04-22T13:32:33.739Z"}],"details":{"listingId":"f8e524b4-0cc8-4acc-b002-150a27582815","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/51/owner \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","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 on Base network using USDC at max 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/nfts/51/owner"},{"claim":"Provider advertises $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/nfts/51/owner"}],"useCases":["Look up the current owner of a specific NFT programmatically","Integrate NFT ownership verification into an agent workflow","Verify NFT holder status before granting access or rewards"],"bestFor":["Agents needing on-demand NFT ownership data without API key management","Micropayment-based access to NFT queries on Base","Quick one-off ownership checks with no subscription commitment"],"notFor":["Bulk or batch NFT ownership queries across large collections (no documented batch support)","Use cases requiring detailed NFT metadata beyond ownership","Users who need free or pre-authenticated API access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.674Z"},"updatedAt":"2026-04-22T13:32:33.739Z"}}