Box Critters has no plans for a Membership Program, it’ll be free for everyone to play. Although Box Critters will always be free to play, but Critters will be able to purchase things with real money.
The Team has an idea of doing something like Minecraft, where if you want to run your own “World” with your own activities, events, etc. you can rent it for a month or so for a payment.
Box Critters Help 