{"id":"e9f6898f-1d5e-4d34-a15e-44f134a060ba","shortId":"Q6jyfq","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 64) 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. This specific endpoint falls under the NFT/Web3 category and returns JSON. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.\n\nDocumentation is minimal — the site's /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns 402 with a well-formed x402 challenge), but the actual response format after payment is unknown.","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 spec or schema documentation available","No example request or response payloads — actual output format after payment is unknown","Endpoint path is hardcoded to NFT ID 64; unclear if other NFT IDs are supported via different paths","Site documentation pages (/api, /pricing, /README) all return only a 'Connect wallet' prompt with no useful content","The provider lists many API categories but none have detailed docs; quality of underlying data is unverifiable"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/64/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/64/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 x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request body schema, no response schema, and no documentation beyond a landing page listing. The endpoint path is specific to NFT ID 64 with no indication of parameterization. Effectively a stub 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'/pricing':164 '/readme':166 '0.02':11,24,80,130 '000':71 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':150 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':154 '20':70 '402':200 '6':76 '64':40 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':51 'actual':210 'address':149 'advertis':66 'ai/ml':120 'analyt':119 'api':84,116 'attach':93 'avail':193 'base':9,22,61,72,156 'base-network' 'broader':110 'call':46 'caller':91 'catalog':111 'categori':140 'challeng':65,207 'confirm':197 'connect':172 'contract':153 'data':4,17,118,123 'decim':77 'detail':179 'direct':147 'document':157,188 'endpoint':28,50,135,195 'equal':79 'exampl':191 'fall':136 'finance/web3':122 'form':205 'format':212 'gate':115 'header':98 'host':108 'id':39 'infer':121 'inform':34 'infrastructur':125 'json':143 'json-response' 'key':85 'limit':88 'live':198 'lowpaymentfee NFT' 'lowpaymentfee.com':30,107 'maxamountrequir':68 'micropay':7,20 'minim':159 'network':62 'nft':2,15,32,38 'nft-ownership-query' 'nft/web3':139 'no-api-key' 'openapi':183 'ownership':3,16,33 'page':167 'pay':44 'pay-per-cal':43 'pay-per-call' 'pay-per-request NFT data' 'payload':192 'payment':97,103,145,214 'per':12,25,45,81,131 'post':52 'price':128 'prompt':174 'proof':104 'protocol':48 'provid':106 'queri':1,14 'rate':87 'request':13,26,53,82,132 'request/response':186 'requir':90 'resolv':169 'respons':211 'return':31,142,199 'schema':187 'settl':56 'simpli':92 'site':161 'span':117 'spec':184 'specif':37,134 'technic':178 'unit':73 'unknown':216 'usdc':58,75,152 'usdc-settlement' 'use':151 'util':126 'valid':101 'via':5,18,41 'wallet':173 'well':204 'well-form':203 'x':96 'x-payment':95 'x402':6,19,47,64,102,114,206 'x402 NFT endpoint' 'x402-gated':113 'x402-micropayment'","prices":[{"id":"90158b19-1fe4-40cb-b521-813f5558586b","listingId":"e9f6898f-1d5e-4d34-a15e-44f134a060ba","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/64/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":"2026-04-21T18:32:28.452Z"}],"sources":[{"listingId":"e9f6898f-1d5e-4d34-a15e-44f134a060ba","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/64/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.452Z","lastSeenAt":"2026-04-22T15:03:11.909Z"}],"details":{"listingId":"e9f6898f-1d5e-4d34-a15e-44f134a060ba","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/64/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 USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/64/owner"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/64/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"},{"claim":"Provider hosts APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Looking up 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 token-gated access logic"],"bestFor":["Agents needing on-demand NFT ownership data with no signup","Developers prototyping x402 payment flows on Base","Low-volume NFT ownership queries where per-call pricing is preferred"],"notFor":["Bulk or high-throughput NFT indexing (no batch endpoint documented)","Querying arbitrary NFT IDs (this endpoint is hardcoded to NFT ID 64)","Users who need detailed NFT metadata beyond ownership"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.706Z"},"updatedAt":"2026-04-22T15:03:11.909Z"}}