getContractMetadata

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A note about tokenType == 'UNKNOWN'

Sometimes in the response, you will see that the tokenType is UNKNOWN for a few NFTs.

This might happen because the smart contract for the NFT collection does not implement the supportsInterface method properly.

• A contract will be marked as erc721 if it implements supportsInterface with interface id: 0x80ac58cd
• If it implements supportsInterface with interface id: 0xd9b67a26, it will be marked as erc1155
• If it implements both, erc721 takes precedence
• if neither is implemented, we will mark it as unknown

So if you see that for the particular NFT collection, it might be wise to add the supportsInterface method and redeploy.

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NOTE

Please note that this endpoint is only available on Ethereum, Polygon, Arbitrum, Optimism, Base & Starknet networks.