{"id":"01e70807-0dd1-49c6-9136-6b77baf8b6ba","shortId":"sjYqH6","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 2) via a POST request. It is part of a broader suite of x402-enabled APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints on the platform share a uniform $0.02-per-request pricing model settled in USDC on the Base network.\n\nThe endpoint uses the x402 payment protocol (version 1) with the \"exact\" scheme. The payment challenge requires a maximum of 20,000 base units of USDC (contract 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payments are sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is gated purely by the x402 payment header.\n\nThe specific functionality of this endpoint — returning the owner of NFT #2 — is narrow. The provider's landing page lists many other endpoints but does not provide detailed documentation, request/response schemas, or example payloads for any of them. The response MIME type is application/json, but the exact response shape is not documented. Because of the lack of documentation and the very specific resource path (hardcoded NFT ID 2), the practical utility for general NFT ownership queries is unclear without further information about whether the ID is parameterized or fixed.","tags":[],"capabilities":["x402-payment","nft-ownership-query","usdc-base-settlement","micropayment-api","no-api-key","pay-per-request"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC micropayment API","pay-per-call NFT data","lowpaymentfee API"],"warnings":["No request or response schema documented — actual payload structure is unknown","Endpoint path is hardcoded to NFT ID 2; unclear if other NFT IDs are supported via different paths","No API documentation, README, or OpenAPI spec available from the provider","Landing page lists many endpoint categories but none have detailed docs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/2/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/2/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). However, there is no OpenAPI schema, no documented request/response format, no examples, and the endpoint path appears hardcoded to a single NFT ID. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful 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'000':113 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '0x8335':119 '1':100 '2':40,170,226 '20':112 '2913':120 '300':139 '6':129 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'access':150 'address':135 'advertis':149 'ai/ml':65 'analyt':64 'api':56,143 'application/json':202 'base':9,22,90,114,122 'broader':50 'challeng':107 'contract':118 'data':4,17,63 'decim':130 'detail':186 'document':187,210,216 'enabl':55 'endpoint':28,72,93,164,181 'equal':124 'exact':103,205 'exampl':191 'finance/web3':67 'fix':247 'function':161 'gate':152 'general':231 'given':126 'hardcod':223 'header':158 'id':39,225,243 'infer':66 'inform':34,239 'infrastructur':69 'key':144 'lack':214 'land':176 'limit':147 'list':178 'lowpaymentfee API' 'lowpaymentfee.com':30 'mani':179 'maximum':110 'micropay':7,20 'micropayment-api' 'mime':199 'model':84 'narrow':172 'network':91 'nft':2,15,32,38,169,224,232 'nft-ownership-query' 'no-api-key' 'offer':57 'owner':167 'ownership':3,16,33,233 'page':177 'parameter':245 'part':47 'path':222 'pay-per-call NFT data' 'pay-per-request' 'payload':192 'payment':97,106,131,157 'per':12,25,81 'per-request':80 'platform':75 'post':43 'practic':228 'price':83 'protocol':98 'provid':61,174,185 'pure':153 'queri':1,14,234 'rate':146 'request':13,26,44,82 'request/response':188 'requir':108 'resourc':221 'respons':198,206 'return':31,165 'schema':189 'scheme':104 'second':140 'sent':133 'settl':85 'shape':207 'share':76 'span':62 'specif':37,160,220 'suit':51 'timeout':141 'type':200 'unclear':236 'uniform':78 'unit':115 'usdc':87,117,127 'usdc-base-settlement' 'use':94 'util':70,229 'version':99 'via':5,18,41 'whether':241 'without':237 'x402':6,19,54,96,156 'x402 NFT endpoint' 'x402-enabled':53 'x402-payment'","prices":[{"id":"c929311b-645a-42a3-a02e-41a05d351bb0","listingId":"01e70807-0dd1-49c6-9136-6b77baf8b6ba","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/2/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":"2026-04-21T18:32:33.080Z"}],"sources":[{"listingId":"01e70807-0dd1-49c6-9136-6b77baf8b6ba","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/2/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.080Z","lastSeenAt":"2026-04-22T04:02:47.646Z"}],"details":{"listingId":"01e70807-0dd1-49c6-9136-6b77baf8b6ba","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/2/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 x402 version 1 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/2/owner"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/2/owner"}],"useCases":["Querying the current owner of a specific NFT on-chain","Integrating NFT ownership checks into agent workflows without API key management","Demonstrating x402 micropayment protocol usage on Base"],"bestFor":["Agents needing quick NFT ownership lookups with no signup","Developers experimenting with x402 payment protocol","Low-volume, pay-as-you-go NFT data retrieval"],"notFor":["Bulk or batch NFT ownership queries across many token IDs","Applications requiring detailed NFT metadata beyond ownership","Users who need free or subscription-based API access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:49.757Z"},"updatedAt":"2026-04-22T04:02:47.646Z"}}