{"id":"0223b0b5-65a5-4b4c-bf1d-595daa775a3e","shortId":"kVXD9r","kind":"x402","title":"Look up NFT ownership data via x402 micropayment on Base for $0.02 per request.","tagline":"Look up NFT ownership data via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns NFT owner information for a specific NFT (ID 75) via an x402 pay-per-call model. The endpoint accepts POST requests and charges 20,000 base units of USDC on the Base network per call, which equals $0.02 USD (USDC uses 6 decimals). 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 x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per request. This particular endpoint is in the NFT category and returns JSON. The x402 challenge confirms the endpoint is live, using the \"exact\" payment scheme settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second payment timeout.\n\nNote that no OpenAPI schema, request body schema, or response body schema is documented. The endpoint's exact input parameters and response structure are unknown beyond the fact that it returns application/json. Callers should experiment or contact the provider for details on what fields are accepted and returned.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","base-network","usdc-settlement","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","NFT holder query","on-chain NFT data"],"warnings":["No OpenAPI or request/response schema available — input parameters and response structure are unknown.","Endpoint path is hardcoded to NFT ID 75; unclear if other NFT IDs are supported at different paths.","Provider description is generic ('Premium API Access') with no NFT-specific documentation.","Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/75/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/75/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented request/response schema, no examples, and the endpoint description is generic ('Premium API Access'). The specific NFT endpoint is a single hardcoded token ID with no broader 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'000':59 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':155 '20':58 '300':158 '6':76 '75':42 'Base USDC micropayment API' 'NFT holder query' 'NFT owner lookup' 'NFT ownership API' 'accept':53,207 'address':154 'ai/ml':115 'analyt':114 'api':79,111 'application/json':193 'attach':88 'base':10,24,60,66 'base-network' 'beyond':187 'bodi':168,172 'broader':105 'call':49,69 'caller':86,194 'categori':135 'challeng':141 'charg':57 'confirm':142 'contact':198 'data':5,19,113,118 'decim':77 'detail':202 'document':175 'endpoint':30,52,130,144,177 'equal':71 'exact':149,179 'experi':196 'fact':189 'field':205 'finance/web3':117 'gate':110 'header':93 'host':103 'id':41 'infer':116 'inform':36 'infrastructur':120 'input':180 'json':138 'json-response' 'key':80 'limit':83 'live':146 'look':1,15 'lowpaymentfee.com':32,102 'micropay':8,22 'model':50 'network':67 'nft':3,17,34,40,134 'nft-ownership-lookup' 'no-api-key' 'note':162 'on-chain NFT data' 'openapi':165 'owner':35 'ownership':4,18 'paramet':181 'particular':129 'pay':47 'pay-per-cal':46 'pay-per-call' 'payment':92,98,150,160 'per':13,27,48,68,126 'post':54 'price':123 'proof':99 'provid':101,200 'rate':82 'request':14,28,55,127,167 'requir':85 'respons':171,183 'return':33,137,192,209 'schema':166,169,173 'scheme':151 'second':159 'settl':152 'simpli':87 'span':112 'specif':39 'structur':184 'suit':106 'timeout':161 'unit':61 'unknown':186 'usd':73 'usdc':63,74 'usdc-settlement' 'use':75,147 'util':121 'valid':96 'via':6,20,43 'x':91 'x-payment':90 'x402':7,21,45,97,109,140 'x402 NFT endpoint' 'x402-gated':108 'x402-micropayment'","prices":[{"id":"91a208e5-5990-4056-bb8b-d4d945c40e6f","listingId":"0223b0b5-65a5-4b4c-bf1d-595daa775a3e","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/75/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":"2026-04-21T18:32:32.603Z"}],"sources":[{"listingId":"0223b0b5-65a5-4b4c-bf1d-595daa775a3e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/75/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.603Z","lastSeenAt":"2026-04-22T07:32:40.783Z"}],"details":{"listingId":"0223b0b5-65a5-4b4c-bf1d-595daa775a3e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/75/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 HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/nfts/75/owner"},{"claim":"Price is 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/75/owner"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Payment timeout is 300 seconds, payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/nfts/75/owner"}],"useCases":["Querying the current owner of a specific NFT programmatically","Integrating NFT ownership checks into automated agent workflows","Verifying NFT holder status without managing API keys or subscriptions"],"bestFor":["Agents needing one-off NFT ownership lookups with no signup","Developers prototyping x402 payment flows on Base","Low-volume NFT data queries where per-call pricing is preferred"],"notFor":["Bulk NFT ownership queries across many token IDs (only one NFT ID is exposed at this path)","Users who need detailed NFT metadata, traits, or transaction history beyond ownership"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.729Z"},"updatedAt":"2026-04-22T07:32:40.783Z"}}