Is Ethereum mainnet's network ERC20?

Hello, I’m getting a token refunded through Metamask and I need confirmation if Ethereum mainnet’s network is ERC20? I’ve added the token address to my wallet as custom token.

If it’s not in ERC20 network, how do I create wallet with ERC20 network and input the token in there?

Hello @Canni, as long as i know Ethereum Mainnet is ERC20 network too

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Hello, thanks for your help.