To add Callisto chain to your Metamask wallet, you need to:
1) click on the profile icon and select “Settings” from the drop-down menu
2) go to “Networks” and click the button in the top right corner labelled “Add network”
3) This will open a form to add a new network
4) Fill in all empty fields according to the instructions (data is given below)
Network Name: Callisto MainnetNew RPC URL: https://clo-geth.0xinfra.comChainID: 820Symbol: CLOBlock Explorer URL: https://callisto.network
5) Once filled in, press the “Save” button.
6) Finished!