Final Result

If we implemented the code correctly, we should have a working ERC-20 token balance app that displays the user's token balances. The app will look like the following:

After setting the address field, the app will display the user's ERC-20 token balances:

Notice how the app also displays images for each token. This is done by fetching the token metadata from listErc20Balances and displaying the token's logo.