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Vextorium NFT Owner Lookup
x402
Vextorium NFT Owner Lookup is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-19).
Returns the current owner address, collection name, and tokenURI of an ERC-721 NFT given a contract address and token ID, across 12 supported EVM chains.
Price / call$0.003
Success—
StatusUnknown
How this service works
558 pay-per-call data APIs for AI agents: Solana and EVM on-chain data, tokenized stocks, DeFi, Hyperliquid, economy and official statistics, FX, validation, web and developer tools. Pay in USDC via x402.
Output
A JSON object containing the current owner wallet address, the collection contract address, the collection name, the token ID, the tokenURI (often an IPFS link), and the network the NFT lives on.
Example use cases
Verify NFT ownership before granting access
“Check who owns token ID 42 on the contract 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D on Ethereum — I need to confirm whether address 0xAbC123... is the real owner before unlocking their premium content.”
Fetch NFT metadata URI for a marketplace
“Get the tokenURI for token ID 7777 on the Base NFT contract 0x1234567890abcdef1234567890abcdef12345678 — I need it to display the artwork and traits on our storefront.”
Track high-value NFT holder changes
“Look up who currently owns Azuki #500 — the token with ID 500 on contract 0xED5AF388653567Af2F388E6224dC7C4b3241C544 on Ethereum — I'm monitoring whether it changed hands recently.”
Technical details
Endpoint
POSThttps://api.vextorium.com/v1/nft-owner?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to resolve the current owner of a specific ERC-721 NFT across any of 12 major EVM chains (Base, Ethereum, Arbitrum, Optimism, Polygon, BNB, Avalanche, Gnosis, Linea, Scroll, Sonic, Unichain) in a single call. Prefer it over on-chain RPC calls when you don't have a Web3 provider set up, or when you need collection name and tokenURI bundled together with ownership in one response. It's ideal for agents verifying NFT gating, enriching NFT listings, or auditing ownership history one token at a time.
Side effects
- Invalid or non-existent contract address returns null owner or error
- Token ID not yet minted returns an error or null fields
- Unsupported network value returns a validation error
- Contract is not ERC-721 compliant and does not implement ownerOf
- Network congestion or RPC issues may cause timeouts
- Malformed contract address (wrong checksum or length) returns a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| network | string | Chain (default base) |
| contract | string | |
| token_id | string |
Output
Schema · Response
{
"type": "json",
"example": {
"name": "BoredApeYachtClub",
"owner": "0x46EFbAedc92067E6d60E84ED6395099723252496",
"network": "ethereum",
"token_id": "1",
"token_uri": "ipfs://QmeSjSinHpPnmXmspMjwiXyN6zS4E9zccariGR3jxcaWtq/1",
"collection": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D"
}
}Tags
x402
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