{"id":"b1106f26-978b-47ba-ba8e-d419f6bdd017","shortId":"XDmVyF","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 (ID 25) via a pay-per-call x402 protocol. The endpoint accepts POST requests and is settled in USDC on the Base network. Each call costs a maximum of $0.02 (20,000 base units of USDC 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 hosts a broader suite of APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced uniformly at $0.02 per request. This particular endpoint focuses on NFT owner lookup. The response MIME type is application/json. The payment is routed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response format for a paid request is unknown.","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","who owns NFT","token holder query","x402 NFT API","Base USDC micropayment API"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown.","Only NFT ID 25 is exposed at this specific URL; unclear if other IDs are supported via path parameter.","Provider docs pages (/api, /pricing, /README) return only a wallet-connect prompt with no content.","The description 'Premium API Access' is generic and does not describe the actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/25/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/25/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 with a valid 402 challenge and clear pricing, but there is no OpenAPI spec, no documented request/response schema, no example payloads, and the broader site docs are empty wallet-connect pages. The endpoint path is narrow (single NFT ID). Effectively a stub 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'/pricing':163 '/readme':165 '0.02':11,24,69,124 '000':71 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':151 '20':70 '25':40 '402':202 '6':77 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':51 'actual':206 'addit':177 'address':146 'ai/ml':113 'analyt':112 'api':80,109 'application/json':140 'attach':90 'avail':193 'base':9,22,61,72,153 'base-network' 'beyond':155 'broader':106 'call':46,64 'caller':88 'challeng':203 'confirm':197 'connect':173 'contract':150 'cost':65 'data':4,17,111,116 'decim':78 'detail':179 'document':154,188 'endpoint':28,50,129,195 'exampl':191 'finance/web3':115 'focus':130 'format':208 'header':95 'host':104 'id':39 'infer':114 'inform':34 'infrastructur':118 'key':81 'land':157 'limit':83 'live':198 'lookup':134 'lowpaymentfee.com':30 'maximum':67 'micropay':7,20 'mime':137 'network':62 'nft':2,15,32,38,132 'nft-ownership-lookup' 'no-api-key' 'openapi':183 'owner':133 'ownership':3,16,33 'page':158,166 'paid':211 'particular':128 'pay':44 'pay-per-cal':43 'pay-per-call' 'payload':192 'payment':94,100,142 'per':12,25,45,125 'post':52 'price':121 'prompt':174 'proof':101 'proper':201 'protocol':48 'provid':103 'queri':1,14 'rate':82 'request':13,26,53,126,212 'request/response':186 'requir':87 'resolv':168 'respons':136,207 'return':31,199 'rout':144 'schema':187 'settl':56 'simpli':89 'span':110 'spars':160 'spec':184 'specif':37 'subscript':85 'suit':107 'technic':178 'token holder query' 'type':138 'uniform':122 'unit':73 'unknown':214 'usdc':58,75,149 'usdc-settlement' 'use':148 'util':119 'valid':98 'via':5,18,41 'wallet':172 'wallet-connect':171 'who owns NFT' 'x':93 'x-payment':92 'x402':6,19,47,99 'x402 NFT API' 'x402-micropayment'","prices":[{"id":"19ba2872-f825-4679-870c-02db0ae99248","listingId":"b1106f26-978b-47ba-ba8e-d419f6bdd017","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/25/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":"2026-04-21T18:32:27.773Z"}],"sources":[{"listingId":"b1106f26-978b-47ba-ba8e-d419f6bdd017","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/25/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.773Z","lastSeenAt":"2026-04-22T20:02:12.948Z"}],"details":{"listingId":"b1106f26-978b-47ba-ba8e-d419f6bdd017","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/25/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 on Base, maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/nfts/25/owner"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/25/owner"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Look up the current owner of a specific NFT programmatically","Integrate NFT ownership checks into agent workflows without API key management","Pay-per-call NFT data retrieval settled on Base L2"],"bestFor":["Agents needing on-demand NFT ownership data without subscription overhead","Developers prototyping x402 payment flows with a low-cost endpoint","Automated workflows that need to verify NFT holders"],"notFor":["Bulk or batch NFT ownership queries across many token IDs (only one ID exposed)","Users who need detailed NFT metadata, transfer history, or collection-level data","Applications requiring free or pre-paid API access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.886Z"},"updatedAt":"2026-04-22T20:02:12.948Z"}}