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How to detect whether a contract can handle ERC20 or not. I have a scenario where I have to send royalties to contracts but how can I know if that contract can handle ERC20 tokens? There is an ERC721Receiver interface for the ERC721 standard that I can implement and that other contracts can use to check if the contract can handle ERC721 or not but I didn't find a such thing for ERC20.

By “handle” I mean that the contract can withdraw tokens and tokens are not locked in it.

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It's unclear what you mean by "handle", but assuming you mean "react to an ERC-20 transfer", this is not possible.

The ERC-20 standard did not specify callbacks (a.k.a. hooks), unlike other token standards such as ERC-777.

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  • Hey! Thank you for your reply. Basically, I mean that I'd like to be sure that receiving contract can withdraw tokens by sending them to another account and that tokens are not locked in the contract.
    – AGJoYy
    Commented Nov 28, 2022 at 14:52
  • So basically, the external contract has to have a function like "transfer" or "withdraw" where it calls the token's contract function "transfer"
    – AGJoYy
    Commented Nov 28, 2022 at 14:54
  • This is not possible. There's an infinite amount of ways in which a withdraw functionality can be implemented in a Turing-complete system like Ethereum.
    – Paul Razvan Berg
    Commented Nov 28, 2022 at 14:57
  • What you may actually want is a way to recover the ERC-20 tokens if they end up in the wrong contract? take a look at my ERC20Recover contract.
    – Paul Razvan Berg
    Commented Nov 28, 2022 at 14:57

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