The short answer to this is no.
All our games are free to play. Most features are ready and available for you once you start the game or as soon as you unlock them as part of the game progression. While you are never required to spend a cent, you might have some limitations placed on your experience, like having to wait for refills. This game style allows you to choose exactly how much you want to spend on your game and which features you want to focus on.
Why Is There Paid Currency Available in the Game?
Kabam and the games we create cannot exist without revenue. The creation, maintenance, and continued development of our games require an entire staff. Our programmers, designers, artists, quality analysts, support agents, and people in many other roles are dedicated to making your experience a memorable one. We are constantly working to improve the tools they need to do their jobs well and to make sure they continue to receive a paycheck every two weeks for their work.
We acquire revenue by selling in-game currency which can enhance your experience with the game beyond what is already available for free. This model is what allows us to continue to support the games and you to enjoy your preferred experience almost completely free of advertising.