Every time you make a bet on bettor mode, you have to pay a small blockchain processing fee (called a "gas fee") to secure the transaction. This fee is denominated in and paid in the ether (ETH) cryptocurrency.
We provide a projection of how many bets your current ETH balance will pay for at current rates. Bet processing fees are typically $0.10-$0.20, meaning $5 of ETH will typically pay for 25-50 bets.
ETH can be purchased and sold for actual US or Canadian dollars through the "Fund Your Account" portal.