Hello @Pirateprincess the one u circled in ur screenshot is the energy and it can be used in features like BGH/Bear Brawl. There is no price for it. All the rewards received on the left hand side are free. The right hand side would be paid rewards.
You can use the energy in special features, like BubbleGum Hill and Bear Brawl. Those features are in your Soda game. To play the βnormalβ levels in Soda you need lives. I hope this clarifies π
Since BGH and Bear brawl are both test features not all players may have it in their game. Incase you don't have both there is no other feature currently that it can be used for. Just keep your game updated and you make see it at some point.