Is there a way to identify if an address is erc721 or erc1155?

Question

I would like to know if there is any method of identifying if an address is erc721 or 1155 without calling the differentiating functions on both.

Does this answer your question? How to check if a contract has a method? — Paul Razvan Berg, Commented Apr 13, 2022 at 16:36

Gonçalo Velosa · Accepted Answer · 2022-06-29 09:51:35Z

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According to the IEP-165 you can, I had a similar issue/question this article helped me.

Hope this helps you out as well!

answered Jun 29, 2022 at 9:51

Gonçalo Velosa

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eth · Accepted Answer · 2022-07-12 08:25:26Z

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A detailed solution to your answer is given Stack Overflow. Please do have a look:

eth♦

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answered Jul 5, 2022 at 23:51

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Ivan Solomichev CG · Accepted Answer · 2023-03-13 22:55:25Z

Answer can be divided into two cases:

address supports ERC165 (implements supportsInterface), but it is not ERC721;
address does not support ERC165 (no supportsInterface implementation). As an example, it can be ERC20, any Smart Contract, EOA, etc.

First case: nftAddress.supportsInterface(type(IERC721).interfaceId); returns false. Thus your require or if - else handles it normally.

Second case: as supportsInterface is not implemented at all, transaction fails without reason.

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