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Base NFT Owner
x402
Base NFT Owner is a paid API for AI agents from api.zfinia.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-10).
Returns the current owner address of a Base ERC721 token at a pinned block, refusing tokens with no owner rather than returning the zero address.
Price / call$0.004
Success—
StatusUnknown
How this service works
Who owns this Base ERC721 token right now? Returns the current owner address at a pinned block. A token with no owner is refused before payment rather than returned as the zero address, which a caller could otherwise mistake for a real holder.
Output
The endpoint returns the current owner's wallet address (a 0x-prefixed Ethereum address) for the specified ERC721 token on Base, pinned to a recent block. If the token has no owner (e.g. burned or never minted), the request is rejected before payment is charged, preventing the caller from receiving a misleading zero address.
Example use cases
Verify NFT ownership before a sale
“Before I proceed with this P2P sale, can you confirm who currently owns token ID 42 from the Base NFT contract 0xDEAD000000000000000042069000000000000000? I want to make sure the seller actually holds it.”
Gate access by NFT ownership
“Check if token ID 7 from the Base ERC721 contract 0xBEEFBEEFbeefbeefbeefbeefbeefbeefbeefbeef currently has an owner — I need the wallet address to grant them access to my platform.”
Audit NFT holder for airdrop eligibility
“I'm preparing an airdrop and need to know who holds token ID 999 from Base contract 0xCAFECAFEcafecafecafecafecafecafecafecafe right now so I can send them the reward.”
Technical details
Endpoint
POSThttps://api.zfinia.com/x402/v1/base-nft-owner?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to resolve the current on-chain owner of a specific ERC721 token on the Base L2 network and want safe handling of ownerless tokens (no misleading zero-address returns). Prefer it over raw RPC calls when you need a pay-per-call, no-infrastructure approach. Best suited for single-token lookups; not designed for bulk ownership queries or non-Base chains.
Side effects
- Token has no owner (burned or unminted) — request is refused before payment is taken
- Invalid contract address format — rejected by input validation
- Invalid token ID format — rejected by input validation
- Contract is not a valid ERC721 contract — may return an error or revert
- Network/RPC unavailability — service returns an error response
- Token ID out of range for the contract — contract call reverts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| contract | string | ERC721 contract address. |
| token_id | string | Token id as a decimal string. |
Tags
x402
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