Is League of Kingdoms free-to-play?

I'm curious to know if League of Kingdoms, being a game that incorporates elements of strategy and finance, is free-to-play or if there are any costs associated with playing the game? As a cryptocurrency and finance enthusiast, I'm always on the lookout for new and exciting ways to engage with these fields, and League of Kingdoms seems like it could offer a unique experience. However, I'd like to understand the financial implications of playing the game before diving in.