{"id":"e4f2ccfa-7521-4726-92da-7a5538352b5d","shortId":"gAEQRm","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 NFT ID 59. It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact-amount scheme. The maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 USD (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are needed — each call is independently paid at the time of request.\n\nThe platform advertises a uniform $0.02 per request pricing model across all its endpoints. The specific endpoint probed (/api/v1/nfts/59/owner) is not listed on the homepage catalog but follows the same pricing and payment pattern. Documentation beyond the landing page is sparse; the /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no additional technical detail.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-payment","base-network","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC micropayment API","on-chain NFT data","lowpaymentfee"],"warnings":["No request or response schema documented — input/output format is unknown","The /api/v1/nfts/59/owner endpoint is not listed on the provider's homepage catalog; its exact functionality is inferred from the URL path","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no technical content","No OpenAPI spec or machine-readable documentation available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/59/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/59/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 and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documented request/response format, no examples, and the specific NFT endpoint is not even listed on the provider's homepage. Documentation pages (/api, /pricing, /README) are empty beyond a wallet-connect 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'/api/v1/nfts/59/owner':158 '/pricing':183 '/readme':185 '0.02':11,24,114,145 '000':103 '0x8335':108 '20':102 '2913':109 '59':38 '6':118 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':74 'across':52,150 'addit':197 'advertis':142 'ai/ml':55 'amount':95,99 'analyt':54 'api':51,121 'base':9,22,68,104,111 'base-network' 'beyond':175 'broader':44 'call':50,131 'catalog':165 'categori':59 'commit':127 'connect':192 'data':4,17,53 'decim':119 'detail':199 'document':174 'endpoint':28,73,153,156 'equal':113 'exact':94 'exact-amount':93 'finance/web3':56 'follow':167 'handl':82 'header':89 'homepag':164 'id':37 'independ':133 'inform':34 'infrastructur':58 'inlin':83 'json':79 'key':122 'land':177 'limit':124 'list':161 'lowpaymentfee' 'lowpaymentfee.com':30 'maximum':98 'micropay':7,20 'minim':191 'model':149 'need':129 'network':69 'nft':2,15,32,36 'nft-ownership-lookup' 'no-api-key' 'offer':46 'on-chain NFT data' 'ownership':3,16,33 'page':178,186 'paid':134 'part':41 'pattern':173 'pay':48 'pay-per-cal':47 'pay-per-request' 'payment':80,88,172 'per':12,25,49,146 'platform':45,141 'post':75 'price':148,170 'probe':157 'prompt':194 'protocol':65 'queri':1,14 'rate':123 'request':13,26,76,139,147 'requir':100 'resolv':188 'return':31,78 'scheme':96 'settl':61 'spars':180 'specif':155 'technic':198 'time':137 'uniform':144 'unit':105 'upfront':126 'usd':115 'usdc':71,107,116 'usdc-payment' 'use':70,90,117 'via':5,18,62,84 'wallet':193 'x':87 'x-payment':86 'x402':6,19,64,92 'x402 NFT endpoint' 'x402-micropayment'","prices":[{"id":"03616176-c1b3-4c66-b8eb-be06d4d2ab9d","listingId":"e4f2ccfa-7521-4726-92da-7a5538352b5d","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/59/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":"e4f2ccfa-7521-4726-92da-7a5538352b5d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/59/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.452Z","lastSeenAt":"2026-04-22T15:03:11.936Z"}],"details":{"listingId":"e4f2ccfa-7521-4726-92da-7a5538352b5d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/59/owner \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/59/owner"},{"claim":"The platform advertises $0.02 per request uniform pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/59/owner"}],"useCases":["Querying the current owner of a specific NFT programmatically","Integrating NFT ownership checks into automated agent workflows","Verifying NFT provenance without managing API keys or subscriptions"],"bestFor":["Agents needing one-off NFT ownership queries with no signup","Developers prototyping Web3 apps who want instant API access","Micropayment-native workflows on Base L2"],"notFor":["Bulk or high-volume NFT indexing (no batch endpoint documented)","Users who need detailed NFT metadata beyond ownership","Anyone without USDC on Base to settle payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.677Z"},"updatedAt":"2026-04-22T15:03:11.936Z"}}