Need ETH where in order to send?

I am trying to send my React Wrapped token from my wallet back to my Base Wallet from which it came. However, my DID wallet needs ETH for the transaction. I have 100 USD worth of ETH in my DID wallet on mainnet. I can send that ETH to my Base Wallet and it recognizes I have the necessary ETH to make that transfer. I am wondering where I need to send ETH in order to send my React token to my Base Wallet?