{"id":"4687dfe8-343d-41df-a2e1-60b16011f709","shortId":"pX45dy","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 #98 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 data, and infrastructure utilities, all priced at $0.02 per request on Base. This specific endpoint (`/api/v1/nfts/98/owner`) falls under the NFT/Web3 category and returns JSON describing the owner of the specified NFT. The response MIME type is application/json. The payment is routed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.\n\nNote that the endpoint path is hardcoded to NFT ID 98; it is unclear from available documentation whether other NFT IDs are queryable via similar paths. No OpenAPI schema, detailed request/response documentation, or example payloads were found in the crawl. The site's non-API pages (pricing, README, /api) all resolve to a minimal \"Connect wallet\" page with no additional documentation.","tags":[],"capabilities":["nft-ownership-lookup","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 owner query","lowpaymentfee"],"warnings":["No OpenAPI or detailed API documentation found; request and response schemas are unknown.","Only NFT #98 is referenced in the endpoint path; unclear if other IDs are supported.","Site pages (/pricing, /README, /api) return only a 'Connect wallet' prompt with no useful content.","No example responses available to verify what data is actually returned."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/98/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/98/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The endpoint path is hardcoded to a single NFT ID with no explanation of parameterization. Effectively a stub 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'/api/v1/nfts/98/owner':134 '0.02':11,24,76,126 '000':67 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':162 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':166 '20':66 '6':72 '98':36,179 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':47 'addit':229 'address':161 'advertis':62 'ai/ml':116 'analyt':115 'api':80,112,214 'application/json':155 'attach':89 'avail':184 'base':9,22,57,68,130,168 'base-network' 'broader':106 'call':42 'caller':87 'categori':139 'challeng':61 'connect':224 'contract':165 'crawl':208 'data':4,17,114,119 'decim':73 'describ':143 'detail':198 'document':185,200,230 'endpoint':28,46,133,172 'equal':75 'exampl':202 'fall':135 'finance/web3':118 'found':205 'gate':111 'hardcod':175 'header':94 'host':104 'id':178,189 'infer':117 'infrastructur':121 'json':142 'json-response' 'key':81 'limit':84 'lowpaymentfee' 'lowpaymentfee.com':30,103 'maxamountrequir':64 'micropay':7,20 'mime':152 'minim':223 'network':58 'nft':2,15,35,149,177,188 'nft-ownership-lookup' 'nft/web3':138 'no-api-key' 'non':213 'non-api':212 'note':169 'on-chain NFT data' 'openapi':196 'owner':33,145 'ownership':3,16 'page':215,226 'path':173,194 'pay':40 'pay-per-cal':39 'pay-per-call' 'payload':203 'payment':93,99,157 'per':12,25,41,77,127 'post':48 'price':124,216 'proof':100 'protocol':44 'provid':102 'queri':1,14 'queryabl':191 'rate':83 'readm':217 'request':13,26,49,78,128 'request/response':199 'requir':86 'resolv':220 'respons':151 'return':31,141 'rout':159 'schema':197 'settl':52 'similar':193 'simpli':88 'site':210 'span':113 'specif':132 'specifi':148 'suit':107 'token owner query' 'type':153 'unclear':182 'unit':69 'usdc':54,71,164 'usdc-settlement' 'use':163 'util':122 'valid':97 'via':5,18,37,192 'wallet':225 'whether':186 'x':92 'x-payment':91 'x402':6,19,43,60,98,110 'x402 NFT endpoint' 'x402-gated':109 'x402-micropayment'","prices":[{"id":"d0ebd2ba-934a-49bf-afdc-aa2eff49d94a","listingId":"4687dfe8-343d-41df-a2e1-60b16011f709","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/98/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":"2026-04-21T18:32:32.242Z"}],"sources":[{"listingId":"4687dfe8-343d-41df-a2e1-60b16011f709","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/98/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.242Z","lastSeenAt":"2026-04-22T10:03:10.121Z"}],"details":{"listingId":"4687dfe8-343d-41df-a2e1-60b16011f709","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/98/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 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/nfts/98/owner"},{"claim":"The provider lists all APIs at $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is routed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.","source_url":"https://lowpaymentfee.com/api/v1/nfts/98/owner"}],"useCases":["Querying the current owner of a specific NFT programmatically","Integrating NFT ownership checks into agent workflows without API key management","Verifying NFT ownership as part of a gating or access-control flow"],"bestFor":["Agents needing quick, keyless NFT ownership lookups","Developers prototyping x402 payment flows on Base","Low-volume, pay-as-you-go NFT data queries"],"notFor":["Bulk or batch NFT ownership queries across many token IDs (only NFT #98 path documented)","Users who need detailed NFT metadata beyond owner address","Applications requiring free or subscription-based access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.313Z"},"updatedAt":"2026-04-22T10:03:10.121Z"}}