{"id":"24dff229-4559-4b52-9f31-da770269a42c","shortId":"JZnNGk","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 a specific NFT (token ID 8) 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 pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with the same x402 payment model on Base.\n\nThis specific endpoint (/api/v1/nfts/8/owner) is narrowly scoped: it returns the owner of NFT #8. There is no documentation on what NFT collection this refers to, what the response schema looks like, or whether other token IDs are supported at similar paths. The endpoint is confirmed live (402 challenge captured), but the lack of OpenAPI schema, response examples, or detailed docs limits confidence in what exactly is returned.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC micropayment API","pay-per-request NFT data","lowpaymentfee NFT"],"warnings":["No OpenAPI or response schema available — response format is unknown","No documentation on which NFT collection token ID 8 belongs to","No indication whether other token IDs are queryable at similar paths","Provider pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/8/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/8/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 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no response examples, no documentation on what NFT collection is queried, and no details on the response format. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. This is effectively a stub 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'0.02':11,24,81,151 '000':72 '20':71 '402':208 '6':77 '8':41,175 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':52 'advertis':67 'ai/ml':122 'analysi':125 'analyt':121 'api':85,118 'attach':94 'base':9,22,62,73,161 'base-network' 'broader':111 'call':47,117 'caller':92 'captur':210 'challeng':66,209 'classif':127 'collect':183 'confid':223 'confirm':206 'convers':144 'data':4,17,120,130 'decim':78 'detail':220 'doc':221 'document':179 'embed':128 'endpoint':28,51,147,164,204 'equal':80 'estim':138 'exact':226 'exampl':218 'exchang':133 'feed':132 'finance/web3':129 'gas':137 'generat':145 'geocod':142 'header':99 'host':109 'id':40,197 'infer':123 'inform':34 'infrastructur':140 'key':86 'lack':213 'like':192 'limit':89,222 'list':149 'live':207 'look':191 'lowpaymentfee NFT' 'lowpaymentfee.com':30,108 'maxamountrequir':69 'micropay':7,20 'model':159 'narrowli':167 'network':63 'nft':2,15,32,38,174,182 'nft-ownership-lookup' 'no-api-key' 'openapi':215 'owner':172 'ownership':3,16,33 'path':202 'pay':45,115 'pay-per-cal':44,114 'pay-per-call' 'pay-per-request NFT data' 'payment':98,104,158 'per':12,25,46,82,116,152 'post':53 'price':131 'proof':105 'protocol':49 'provid':107 'queri':1,14 'quot':136 'rate':88,134 'refer':185 'request':13,26,54,83,153 'requir':91 'respons':189,217 'return':31,170,228 'schema':190,216 'scope':168 'sentiment':124 'settl':57 'similar':201 'simpli':93 'span':119 'specif':37,163 'suit':112 'summar':126 'support':199 'token':39,135,196 'unit':74 'usdc':59,76 'usdc-settlement' 'util':141 'valid':102,143 'via':5,18,42 'whether':194 'x':97 'x-payment':96 'x402':6,19,48,65,103,157 'x402 NFT endpoint' 'x402-micropayment'","prices":[{"id":"6351c34f-1419-4134-bf7a-16e52432f1cc","listingId":"24dff229-4559-4b52-9f31-da770269a42c","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/8/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":"2026-04-21T18:32:32.402Z"}],"sources":[{"listingId":"24dff229-4559-4b52-9f31-da770269a42c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/8/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.402Z","lastSeenAt":"2026-04-22T09:02:26.138Z"}],"details":{"listingId":"24dff229-4559-4b52-9f31-da770269a42c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/8/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 402 with x402 challenge advertising USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/8/owner"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/8/owner"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/8/owner"}],"useCases":["Querying the current owner of a specific NFT programmatically","Integrating NFT ownership checks into automated agent workflows","Verifying NFT ownership without managing API keys or subscriptions"],"bestFor":["Agents needing one-off NFT ownership lookups with instant crypto payment","Developers exploring x402 protocol integrations on Base","Low-friction, keyless access to NFT metadata"],"notFor":["Bulk NFT collection enumeration or batch ownership queries","Users who need detailed NFT metadata beyond ownership (traits, images, history)","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.075Z"},"updatedAt":"2026-04-22T09:02:26.138Z"}}