How to assure a contract address is ERC20 compliant?

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I’m building some contracts that interact with ERC20’s, but these ERC20’s are specified by some of the users and used by others.

How do I assure that the contract addresses supplied are ERC20 compliant?

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Hi @realisation,

You can check if an address is a contract: Address isContract

You can use SafeERC20 to wrap ERC20 operations to revert on failure.

You could try calling some of the IERC20 functions.

I am not sure if there is anything else you can do to ensure that contracts are ERC20 compliant, perhaps someone in the community can add to this.

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There is nothing you can do to detect whether the contract addresses supplied are ERC20 compliant. As @abcoathup said, you can check that the address is a contract using isContract, and you can additionally call the balanceOf function, but this should only be meant to protect against accidents.

Your contract has to be tolerant to receiving non-compliant contracts. You should be careful, for example, that your contract does not lose people’s funds if it finds intself interacting with a non-ERC20 contract.

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Hi @realisation,

Did the replies answer your question? Do you have further questions?

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Hi @realisation,

I thought the Online ERC20 Contract Verifier might be of interest:

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I found this as well: https://github.com/ethereum/EIPs/issues/2290

An official ERC20 factory

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You can use tools like isiterc20.xyz to check if a smart contract address implements the ERC-20 interface. Just enter the contract address and select the network to verify.