As a group Admin, you can decide to make your group free (open) or premium (paid) for members who want to join or stay in the group.
To make your group premium, follow the steps below:
Login to https://app.alty.com.
Click on group name.
Click the Settings tab and scroll down to the Advanced setting section at the bottom as shown in the image.
Change group from “Free” to “Premium”.
Select “Algorand Standard Asset” from the drop down.
Select your newly created Token code from the drop down.
Select minimum balance that members must have in their wallets in the “Staking Price” field.
Select the amount of time members will remain in community before being kicked out in the “Grace Period” field.
Scroll down and click the “Save” button