Can your existing Bitcoin wallet handle all these cryptocurrencies?

Most Bitcoin wallets can also support other cryptocurrencies. Check your currency wallet to see what works.

How can you tell if you will have to pay anything to send or receive crypto payments?

You can check your crypto wallet or exchange that holds your currency to see what it might charge when handling your funds. An online casino likely won’t charge anything on top of what a wallet or exchange charges.

Is network congestion going to be a problem?

Network congestion might be an issue if you use Bitcoin, as there are massive numbers of transactions on that market each day. Sticking with an alternative crypto option may help, as you likely won’t deal with congestion because either the currency isn’t as active or the method for handling it is easier to manage.