{"id":"b12a12e5-1be1-4743-bd11-1f5e56d93f6b","shortId":"Zwvznm","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 the owner of NFT #76 via a pay-per-call x402 protocol. The endpoint accepts POST requests and charges 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — payment is handled inline via the X-PAYMENT header using the x402 exact payment scheme.\n\nThe broader lowpaymentfee.com platform advertises a wide catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation), all priced at $0.02 per request on the Base network. This specific endpoint falls under the NFT/Web3 category, returning ownership information for a particular NFT.\n\nBecause there is no OpenAPI schema, no documented request/response body format, and no examples beyond the x402 challenge itself, the exact shape of the response is unknown. The endpoint is confirmed live (returns 402 with a valid x402 challenge). The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","base-network","usdc-payment","pay-per-call","no-api-key","no-rate-limit"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","on-chain NFT data","x402 NFT endpoint","micropayment API","Base USDC API","token owner query"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","Endpoint is hardcoded to NFT #76; no evidence of parameterized NFT ID support.","No crawled documentation beyond a landing page listing; /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content.","The platform lists many API categories but it is unclear whether all endpoints are actually functional or placeholders."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/76/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/76/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 challenge with clear pricing, but there is no OpenAPI schema, no request/response body documentation, no examples, and the endpoint is narrowly scoped to a single NFT ID. The purpose and response format must be inferred entirely from the URL path and generic 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'000':53 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':206 '0x8335':58 '20':52 '2913':59 '402':194 '6':71 '76':36 'Base USDC API' 'NFT owner lookup' 'NFT ownership API' 'accept':47 'address':205 'advertis':101 'ai/ml':114 'analyt':113 'api':74,110 'base':9,22,54,62,144,208 'base-network' 'beyond':175 'bodi':170 'broader':98 'call':42,109 'catalog':104 'categori':153 'challeng':178,199 'charg':51 'classif':118 'confirm':191 'convers':134 'data':4,17,112 'decim':72 'document':168 'embed':119 'endpoint':28,46,148,189 'equal':65 'estim':128 'exact':94,181 'exampl':174 'exchang':123 'fall':149 'feed':122 'finance/web3':120 'format':171 'gas':127 'generat':135 'geocod':132 'handl':83 'header':90 'infer':115 'inform':156 'infrastructur':130 'inlin':84 'key':75 'limit':78 'live':192 'lowpaymentfee.com':30,99 'micropay':7,20 'micropayment API' 'network':63,145 'nft':2,15,35,160 'nft-ownership-lookup' 'nft/web3':152 'no-api-key' 'no-rate-limit' 'on-chain NFT data' 'openapi':165 'owner':33 'ownership':3,16,155 'particular':159 'pay':40,107 'pay-per-cal':39,106 'pay-per-call' 'payment':81,89,95,201 'per':12,25,41,67,108,140 'platform':100 'post':48 'price':121,137 'protocol':44 'queri':1,14 'quot':126 'rate':77,124 'request':13,26,49,68,141 'request/response':169 'requir':80 'respons':185 'return':31,154,193 'schema':166 'scheme':96 'sentiment':116 'settl':203 'shape':182 'span':111 'specif':147 'summar':117 'token':125 'token owner query' 'unit':55 'unknown':187 'usdc':57,69 'usdc-payment' 'use':70,91 'util':131 'valid':133,197 'via':5,18,37,85 'wide':103 'x':88 'x-payment':87 'x402':6,19,43,93,177,198 'x402 NFT endpoint' 'x402-micropayment'","prices":[{"id":"3eb6a526-d8d4-43a8-8839-fc8b4de748f1","listingId":"b12a12e5-1be1-4743-bd11-1f5e56d93f6b","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/76/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":"2026-04-21T18:32:32.762Z"}],"sources":[{"listingId":"b12a12e5-1be1-4743-bd11-1f5e56d93f6b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/76/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.762Z","lastSeenAt":"2026-04-22T05:32:23.987Z"}],"details":{"listingId":"b12a12e5-1be1-4743-bd11-1f5e56d93f6b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/76/owner \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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 HTTP 402 with an x402 challenge advertising 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/76/owner"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/76/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":"Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/nfts/76/owner"}],"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 demand"],"bestFor":["Agents or apps needing one-off NFT ownership lookups without subscription overhead","Developers who want keyless, pay-per-call access to NFT data","Workflows that already settle payments in USDC on Base"],"notFor":["Bulk or high-volume NFT indexing (no batch endpoint documented)","Users who need ownership data for arbitrary NFT IDs (this endpoint is scoped to NFT #76)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.512Z"},"updatedAt":"2026-04-22T05:32:23.987Z"}}