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base-nft-owner
x402
base-nft-owner is a paid API for AI agents from x402.agentindex.world, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-11).
Looks up the current owner wallet address of a specific ERC721 NFT on Base mainnet by calling ownerOf(tokenId).
Price / call$0.003
Success—
StatusUnknown
How this service works
Who owns this NFT? ERC721 owner lookup on Base mainnet via ownerOf(tokenId).
Output
Returns the wallet address (Ethereum address string) of the current owner of the specified ERC721 token on Base mainnet, as returned by the contract's ownerOf(tokenId) function.
Example use cases
Verify NFT ownership before granting access
“Check who currently owns token ID 88 of the contract 0xabcdef1234567890abcdef1234567890abcdef12 on Base — I need to confirm if wallet 0xUser123 is the rightful holder before giving them access.”
Track NFT transfer after marketplace sale
“I just sold token ID 5 from contract 0x1234567890abcdef1234567890abcdef12345678 on Base — can you confirm who the new owner is now?”
Display NFT owner on a collector dashboard
“For my NFT gallery dashboard, who holds token ID 200 of the Base NFT contract 0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef right now?”
Technical details
Endpoint
GEThttps://x402.agentindex.world/base/nft-owner?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to resolve the current owner of a specific ERC721 NFT on Base mainnet and have both the contract address and token ID. Prefer this over generic blockchain explorers when you need a programmatic, pay-per-call lookup without maintaining RPC infrastructure or API keys.
Side effects
- Token ID does not exist or has not been minted — contract reverts, returns error
- Invalid or non-ERC721 contract address provided
- Contract address is not deployed on Base mainnet
- Token has been burned — ownerOf may revert or return zero address
- Network RPC timeout or Base node unavailability
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string | |
| token_id | integer |
Tags
x402
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