{"id":"a6d8d46f-0476-4d35-9d1e-3f35d6caaeec","shortId":"GrjzAY","kind":"x402","title":"Query NFT ownership data on Base via x402 micropayment (USDC or USDT).","tagline":"Query NFT ownership data on Base via x402 micropayment (USDC or USDT).","description":"This endpoint returns NFT ownership information for a given collection on the Base blockchain. It is an x402-gated POST endpoint operated by Erudite Intelligence LLC. Callers send a JSON body containing a `collection` field (an NFT collection address or slug) and receive a JSON response indicating which NFTs are owned.\n\nPayment is required per-call via the x402 protocol (version 2). The endpoint accepts two payment options: USDC on Base (EIP-155:8453) or USDT on Tron, both at an amount of 10,000 base units — which equals $0.01 per request (both USDC and USDT use 6 decimals). The facilitator for Base payments is Coinbase CDP. The provider is registered as a FinCEN MSB (BSA ID 31000324258137) and operates a non-custodial settlement model.\n\nDocumentation is sparse. The crawled landing page describes the EruditePay Bridge facilitator infrastructure but does not document the `/v1/base/nft/owned` data endpoint specifically. The Bazaar schema embedded in the 402 challenge provides the input/output contract: POST a JSON body with a `collection` string property, and receive `{\"success\": true, \"data\": {}}`. The exact structure of the `data` object is not documented, so consumers should expect an object whose shape may vary by collection.","tags":[],"capabilities":["nft-ownership-query","base-chain-nft","x402-payment","usdc-payment","usdt-tron-payment","json-api","per-call-micropayment"],"categories":["crypto","nft","blockchain-data"],"synonyms":["NFT holder lookup","NFT owned tokens","Base NFT ownership","NFT collection holders","crypto NFT API","on-chain NFT data","ERC-721 ownership"],"warnings":["No dedicated documentation for /v1/base/nft/owned — the docs URL returns endpoint_not_found","The example output in the Bazaar schema shows an empty data object; actual response structure is unknown","The endpoint description in the 402 challenge is generic ('Crypto data intelligence') and does not specifically describe NFT ownership"],"endpointUrl":"https://bridge.eruditepay.com/v1/base/nft/owned","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x24c5da6267AEbEBfCBf7B325753C5B2538A5B09B","amount":"3000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t","extra":{"name":"TronTransferAuthorization","version":"1","wrapper":"THGkLBrLY1G5VovZjjK1jP9upyxRdMNL3b"},"payTo":"TSevuRZFjpckeMSSDhQFoiAkPCkckuE5TP","amount":"3000","scheme":"exact","network":"tron:728126428","maxTimeoutSeconds":300}]},"qualityScore":"0.450","qualityRationale":"The endpoint is live (402 challenge captured) with a clear Bazaar schema for input, but the output data structure is only shown as an empty placeholder. No dedicated documentation exists for this specific endpoint — the crawled docs path returns 404. Pricing is clear ($0.01/call) but the actual response payload is 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'/v1/base/nft/owned':171 '0.01':116 '000':111 '10':110 '2':88 '31000324258137':144 '402':181 '6':124 '8453':100 'Base NFT ownership' 'ERC-721 ownership' 'NFT collection holders' 'NFT holder lookup' 'NFT owned tokens' 'accept':91 'address':64 'amount':108 'base':6,18,37,97,112,129 'base-chain-nft' 'bazaar':176 'blockchain':38 'bodi':56,190 'bridg':163 'bsa':142 'call':82 'caller':52 'cdp':133 'challeng':182 'coinbas':132 'collect':34,59,63,193,222 'consum':212 'contain':57 'contract':186 'crawl':157 'crypto NFT API' 'custodi':150 'data':4,16,172,200,206 'decim':125 'describ':160 'document':153,169,210 'eip':98 'embed':178 'endpoint':26,46,90,173 'equal':115 'erudit':49 'eruditepay':162 'exact':202 'expect':214 'facilit':127,164 'field':60 'fincen':140 'gate':44 'given':33 'id':143 'indic':72 'inform':30 'infrastructur':165 'input/output':185 'intellig':50 'json':55,70,189 'json-api' 'land':158 'llc':51 'may':219 'micropay':9,21 'model':152 'msb':141 'nft':2,14,28,62 'nft-ownership-query' 'nfts':74 'non':149 'non-custodi':148 'object':207,216 'on-chain NFT data' 'oper':47,146 'option':94 'own':76 'ownership':3,15,29 'page':159 'payment':77,93,130 'per':81,117 'per-cal':80 'per-call-micropayment' 'post':45,187 'properti':195 'protocol':86 'provid':135,183 'queri':1,13 'receiv':68,197 'regist':137 'request':118 'requir':79 'respons':71 'return':27 'schema':177 'send':53 'settlement':151 'shape':218 'slug':66 'spars':155 'specif':174 'string':194 'structur':203 'success':198 'tron':104 'true':199 'two':92 'unit':113 'usdc':10,22,95,120 'usdc-payment' 'usdt':12,24,102,122 'usdt-tron-payment' 'use':123 'vari':220 'version':87 'via':7,19,83 'whose':217 'x402':8,20,43,85 'x402-gated':42 'x402-payment'","prices":[{"id":"5f386c1b-ba5e-4b15-aa76-6166cb7bb75c","listingId":"a6d8d46f-0476-4d35-9d1e-3f35d6caaeec","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":null,"chain":"base","payTo":"0x24c5da6267AEbEBfCBf7B325753C5B2538A5B09B","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x24c5da6267AEbEBfCBf7B325753C5B2538A5B09B","amount":"3000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t","extra":{"name":"TronTransferAuthorization","version":"1","wrapper":"THGkLBrLY1G5VovZjjK1jP9upyxRdMNL3b"},"payTo":"TSevuRZFjpckeMSSDhQFoiAkPCkckuE5TP","amount":"3000","scheme":"exact","network":"tron:728126428","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:36.579Z"}],"sources":[{"listingId":"a6d8d46f-0476-4d35-9d1e-3f35d6caaeec","source":"x402_bazaar","sourceId":"https://bridge.eruditepay.com/v1/base/nft/owned","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:36.579Z","lastSeenAt":"2026-04-22T05:32:28.694Z"}],"details":{"listingId":"a6d8d46f-0476-4d35-9d1e-3f35d6caaeec","quickStartSnippet":"curl -X POST https://bridge.eruditepay.com/v1/base/nft/owned \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\" \\\n  -d '{\"collection\": \"0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D\"}'","exampleRequest":{"collection":"0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D"},"exampleResponse":{"data":{},"success":true},"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 v2 challenge, accepting USDC on Base and USDT on Tron at 10000 base units each","source_url":"https://bridge.eruditepay.com/v1/base/nft/owned"},{"claim":"Provider is Erudite Intelligence LLC, FinCEN MSB registered with BSA ID 31000324258137","source_url":"https://bridge.eruditepay.com"},{"claim":"Base USDC facilitator is Coinbase CDP (api.cdp.coinbase.com)","source_url":"https://bridge.eruditepay.com/v1/base/nft/owned"},{"claim":"Settlement model is non-custodial with 0.5% per settlement fee","source_url":"https://bridge.eruditepay.com"}],"useCases":["Check which NFTs a collection has distributed and to whom on Base","Token-gate access by verifying NFT ownership for a specific collection","Build dashboards showing NFT holder distributions for Base collections","Integrate NFT ownership checks into trading bots or portfolio trackers"],"bestFor":["Developers needing per-call NFT ownership data without API key subscriptions","Agents that can pay with USDC on Base or USDT on Tron via x402","Applications requiring on-demand Base-chain NFT intelligence"],"notFor":["Bulk historical NFT analytics requiring thousands of free queries","Multi-chain NFT queries beyond Base (endpoint is Base-specific)","Users who cannot make x402 crypto micropayments"],"kindDetails":{},"updatedAt":"2026-04-22T01:51:21.728Z"}}