Beneath most of "Why is crypto so volatile?" is one fact: a coin's price keeps moving while it sits in an account. A balance held in coins changes value even when no bet is placed. A win can shrink while it waits for withdrawal, and a losing session can look better or worse than it really was. How a casino displays and converts a crypto balance decides how much of that movement reaches the player, and stablecoins remove most of it.
Keeping a simple record of each deposit and withdrawal, with the coin amount and its value on the day, is the only reliable way to know how a period of play really went. Coins left in a casino account between sessions carry the price risk and the account risk at once. Withdrawing what is not needed for the next session, and moving it to a wallet or converting it, keeps a casino balance from becoming an accidental investment.
Stablecoins are coins designed to hold a fixed value against a national currency, and many casinos accept them alongside more volatile coins. A balance kept in a stablecoin keeps its everyday value from one day to the next, which makes budgets and results easy to read. The peg depends on the issuer and has slipped on rare occasions, and some stablecoins exist on several networks, so the network named at the cashier still has to match.
The casino's own rate, which is rarely the market price; comparing it with a public price at the same moment shows the gap.
A stablecoin is designed to hold a fixed value against ordinary money, so the balance keeps its everyday worth from one day to the next.
Yes, a held coin can lose value. Its price keeps moving while it sits in an account, so a win may shrink before it is withdrawn.
Coins kept there between sessions carry both price risk and account risk, so moving out what the next session does not need limits both.