{"id":"1447de7c-d598-4eb2-9cff-a3e4ccc3f0b5","shortId":"hdNqaN","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 23) 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 catalog 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 falls under the NFT/Web3 category and returns JSON. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.\n\nDocumentation is minimal — the site's pricing, README, and API pages all resolve to a \"Connect wallet\" prompt with no further detail. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and no example payloads. The endpoint is confirmed live (402 challenge returned successfully).","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","x402 NFT endpoint","Base USDC micropayment API","pay-per-request NFT data","lowpaymentfee NFT"],"warnings":["No OpenAPI or schema documentation available — request and response formats are undocumented.","The endpoint path is hardcoded to NFT ID 23; it is unclear whether other NFT IDs are supported at different paths.","Site documentation pages (/api, /pricing, /README) all return only a 'Connect wallet' prompt with no useful content.","The provider description 'Premium API Access' is generic and does not describe the actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/23/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/23/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 via a valid 402 x402 challenge with clear pricing and payment details. However, there is no OpenAPI spec, no documented request body schema, no example responses, and the site's docs pages are empty beyond a wallet-connect prompt. The actual data returned by this endpoint is 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'000':71 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':152 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':157 '20':70 '23':40 '402':206 '6':76 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':51 'address':151 'advertis':66 'ai/ml':120 'analyt':119 'api':84,116,169 'attach':93 'base':9,22,61,72,134,159 'base-network' 'beyond':190 'broader':110 'call':46 'caller':91 'catalog':111 'categori':142 'challeng':65,193,207 'confirm':204 'connect':175 'contract':156 'data':4,17,118,123 'decim':77 'detail':181 'direct':149 'document':160 'endpoint':28,50,137,202 'equal':79 'exampl':199 'fall':138 'finance/web3':122 'gate':115 'header':98 'host':108 'id':39 'infer':121 'inform':34 'infrastructur':125 'json':145 'json-response' 'key':85 'limit':88 'live':205 'lowpaymentfee NFT' 'lowpaymentfee.com':30,107 'maxamountrequir':68 'micropay':7,20 'minim':162 'network':62 'nft':2,15,32,38 'nft-ownership-query' 'nft/web3':141 'no-api-key' 'openapi':185 'outputschema':195 'ownership':3,16,33 'page':170 'pay':44 'pay-per-cal':43 'pay-per-call' 'pay-per-request NFT data' 'payload':200 'payment':97,103,147 'per':12,25,45,81,131 'post':52 'price':128,166 'prompt':177 'proof':104 'protocol':48 'provid':106 'queri':1,14 'rate':87 'readm':167 'request':13,26,53,82,132 'request/response':188 'requir':90 'resolv':172 'return':31,144,208 'schema':189 'settl':56 'simpli':92 'site':164 'span':117 'spec':186 'specif':37,136 'stub':196 'success':209 'unit':73 'usdc':58,75,155 'usdc-settlement' 'use':153 'util':126 'valid':101 'via':5,18,41 'wallet':176 'x':96 'x-payment':95 'x402':6,19,47,64,102,114,192 'x402 NFT endpoint' 'x402-gated':113 'x402-micropayment'","prices":[{"id":"4004729f-4458-4c17-a976-0b8cbe3837da","listingId":"1447de7c-d598-4eb2-9cff-a3e4ccc3f0b5","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/23/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":"2026-04-21T18:32:27.996Z"}],"sources":[{"listingId":"1447de7c-d598-4eb2-9cff-a3e4ccc3f0b5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/23/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.996Z","lastSeenAt":"2026-04-22T18:05:11.072Z"}],"details":{"listingId":"1447de7c-d598-4eb2-9cff-a3e4ccc3f0b5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/23/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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/23/owner"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/23/owner"},{"claim":"All APIs 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":"The provider offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying the current owner of a specific NFT programmatically","Integrating NFT ownership checks into agent workflows without API key management","Building Web3 dashboards that verify NFT holders on-the-fly"],"bestFor":["Agents needing quick NFT ownership lookups without subscription overhead","Developers prototyping Web3 apps who want instant, keyless API access","Low-volume or sporadic NFT data queries where $0.02/call is cost-effective"],"notFor":["Bulk NFT indexing across thousands of tokens (no batch endpoint documented)","Querying NFTs beyond ID 23 on this specific endpoint path (would need different endpoint paths)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.442Z"},"updatedAt":"2026-04-22T18:05:11.072Z"}}