Yes, probably!
We use the "Skillz multiplayer system" created by a partner company called Skillz Inc. Their system is used in a number of different games in addition to ours and they are responsible for making the cash tournaments available in locations where it is legal to participate. With that said, all of our games are totally free to download and play everywhere. There are certain tournaments within the games that require a cash entry fee and pay out cash prizes and those are restricted to places where they are considered legal.
International payments are handled through Paypal, so you will need to be able to access a paypal account to participate in the real money games.
If you want to get a more specific answer, you can send them an email at support@skillz.com and they should be able to tell you for sure.