Yes! It is possible to access your balance and items across several devices. As long as you use the same Xbox or Microsoft account to play the game, every item you buy will permanently be available across all of your devices! Options may vary though, according to the different versions of the game. For instance, the Marketplace is not available in the Java Edtion of the game, but Minecoins can still be used to get a Realms subscription. For more information, please visit the Marketplace FAQ page.