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NFT Owner Lookup
x402
NFT Owner Lookup is a paid API for AI agents from bess-x402.onrender.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).
Returns the current owner address of an ERC-721 NFT given its contract address and token ID, on EVM-compatible chains.
Price / call$0.002
Success—
StatusUnknown
How this service works
Current owner of an ERC-721 NFT by contract and token ID. Use to verify ownership for token gating, sales or airdrops.
Output
Returns the current owner's wallet address for the specified ERC-721 NFT token, identified by contract address and token ID on the requested EVM chain (Ethereum, Base, Arbitrum, Optimism, or Polygon).
Example use cases
Token gating NFT access
“Before letting this user into our exclusive Discord server, check if they own token ID 77 on our NFT contract 0xAbC123...def456 on Ethereum — tell me the current owner address.”
Airdrop eligibility check
“I need to verify that wallet 0x742d35Cc...abc123 is the current owner of token ID 500 on contract 0xDEAD...BEEF on Polygon before sending them the airdrop.”
Pre-sale ownership verification
“Someone is trying to sell token ID 3301 from the Azuki collection at contract 0xED5AF388...1234 on Ethereum — can you confirm who actually owns that token right now?”
Technical details
Endpoint
GEThttps://bess-x402.onrender.com/v1/evm/nft-owner?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, pay-per-call on-chain ownership lookup for a single ERC-721 NFT without setting up your own RPC node. Ideal for token gating, airdrop verification, and pre-sale ownership checks across Ethereum, Base, Arbitrum, Optimism, and Polygon. Prefer this over indexer APIs when you need real-time on-chain accuracy rather than indexed data that may lag.
Side effects
- Invalid contract address returns an error or null owner
- Token ID does not exist on the contract (reverts on-chain)
- Unsupported chain name returns a validation error
- Network/RPC timeout causes a failed response
- Contract is not ERC-721 compliant and does not support ownerOf
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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