{"id":"397a1874-35de-44f9-934a-222e97d77a6c","shortId":"Gng8rD","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 42) 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, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per request on the Base network. This specific endpoint falls under the NFT/Web3 category. The response MIME type is application/json.\n\nNote that the endpoint path is hardcoded to NFT ID 42; it is unclear from available documentation whether other NFT IDs are supported via different paths or parameters. No OpenAPI schema, detailed request/response documentation, or example payloads were found in the crawl. The endpoint is confirmed live (returns 402 challenge as expected for x402).","tags":[],"capabilities":["nft-ownership-query","x402-micropayment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","token holder query","x402 NFT endpoint","Base USDC micropayment API","NFT metadata","on-chain ownership"],"warnings":["No OpenAPI or detailed API documentation found for this endpoint.","No example request or response payloads available — actual response schema is unknown.","Endpoint path is hardcoded to NFT ID 42; unclear if other IDs are supported.","Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/42/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/42/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation beyond the landing page listing. The specific functionality (NFT owner lookup) is inferred from the URL path 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'000':72 '20':71 '402':201 '42':41,163 '6':77 'Base USDC micropayment API' 'NFT metadata' 'NFT owner lookup' 'NFT ownership API' 'accept':52 'advertis':67 'ai/ml':122 'analyt':121 'api':85,118 'application/json':152 'attach':94 'avail':168 'base':9,22,62,73,137 'base-network' 'broader':111 'call':47,117 'caller':92 'categori':146 'challeng':66,202 'confirm':198 'crawl':194 'data':4,17,120,125 'decim':78 'detail':184 'differ':177 'document':169,186 'endpoint':28,51,141,156,196 'equal':80 'exampl':188 'expect':204 'fall':142 'finance/web3':124 'found':191 'hardcod':159 'header':99 'host':109 'id':40,162,173 'infer':123 'inform':34 'infrastructur':127 'json-response' 'key':86 'limit':89 'live':199 'lowpaymentfee.com':30,108 'maxamountrequir':69 'micropay':7,20 'mime':149 'network':63,138 'nft':2,15,32,38,161,172 'nft-ownership-query' 'nft/web3':145 'no-api-key' 'note':153 'on-chain ownership' 'openapi':182 'ownership':3,16,33 'paramet':180 'path':157,178 'pay':45,115 'pay-per-cal':44,114 'pay-per-call' 'payload':189 'payment':98,104 'per':12,25,46,82,116,133 'post':53 'price':130 'proof':105 'protocol':49 'provid':107 'queri':1,14 'rate':88 'request':13,26,54,83,134 'request/response':185 'requir':91 'respons':148 'return':31,200 'schema':183 'settl':57 'simpli':93 'span':119 'specif':37,140 'suit':112 'support':175 'token':39 'token holder query' 'type':150 'unclear':166 'unit':74 'usdc':59,76 'usdc-settlement' 'util':128 'valid':102 'via':5,18,42,176 'whether':170 'x':97 'x-payment':96 'x402':6,19,48,65,103,206 'x402 NFT endpoint' 'x402-micropayment'","prices":[{"id":"ebcc3931-e307-40a0-9cbb-a142bfc88bfa","listingId":"397a1874-35de-44f9-934a-222e97d77a6c","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/42/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":"2026-04-21T18:32:33.051Z"}],"sources":[{"listingId":"397a1874-35de-44f9-934a-222e97d77a6c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/42/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.051Z","lastSeenAt":"2026-04-22T04:02:47.610Z"}],"details":{"listingId":"397a1874-35de-44f9-934a-222e97d77a6c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/42/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 maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/42/owner"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/42/owner"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying the current owner of a specific NFT programmatically","Integrating NFT ownership checks into automated agent workflows","Verifying NFT holder status without running a full node or indexer"],"bestFor":["Agents needing quick NFT ownership lookups with no signup","Micropayment-based access to Web3 data without API keys","Low-friction, pay-as-you-go NFT data retrieval on Base"],"notFor":["Bulk querying of thousands of NFTs (no batch endpoint documented)","Historical ownership or transfer history lookups (not indicated)","Free-tier or subscription-based access needs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:49.854Z"},"updatedAt":"2026-04-22T04:02:47.610Z"}}