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Saylor Innovations NFT Owner Lookup (ERC-721, Ethereum)
x402
Saylor Innovations NFT Owner Lookup (ERC-721, Ethereum) is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-30).
Returns the current owner address of a specific ERC-721 NFT token on Ethereum given a contract address and token ID
Price / call$0.002
Success—
StatusUnknown
How this service works
NFT Owner (ERC-721) (ethereum). NFT owner (ERC-721 ownerOf) for any collection on Base, Ethereum, Arbitrum, Optimism or Polygon.
Output
Returns the current on-chain owner wallet address of the specified ERC-721 token on Ethereum, sourced directly from blockchain state. Includes the owner's Ethereum address for the given contract and token ID.
Example use cases
Verify NFT ownership before gating access
“Before granting this user access to our members-only area, can you check on-chain whether wallet 0xABC123... actually owns token ID 42 of the NFT contract at 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D on Ethereum?”
Track who holds a specific NFT token
“I want to know who currently holds token ID 1 of the Bored Ape Yacht Club contract at 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D on Ethereum — pull the owner's wallet address from the blockchain.”
NFT provenance check before purchase
“I'm thinking of buying this NFT — can you check on-chain who currently owns token ID 7 of the ERC-721 contract at 0x23581767a106ae21c074b2276D25e5C3e136a68e on Ethereum so I can verify the seller is the real owner?”
Technical details
Endpoint
GEThttps://saylorinnovations.com/api/evm/ethereum/nft-owner/:address/1?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a direct on-chain lookup of who currently owns a specific ERC-721 NFT token on Ethereum. Prefer this over indexers or marketplaces when you need authoritative, real-time blockchain state rather than potentially stale cached data. Ideal for ownership verification, access gating, and provenance checks on Ethereum mainnet.
Side effects
- Invalid contract address returns an error or null owner
- Token ID does not exist on the contract returns a not-found or zero-address response
- Contract address is not an ERC-721 contract returns an error
- Network congestion or node unavailability may cause timeouts
- Malformed address format returns a validation error
Tags
x402
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