Underlying "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.
Stablecoins are coins designed to hold a fixed value against a traditional 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 must still match.
Bonuses at crypto casinos are fixed either in the coin or in a traditional currency, and the difference shows over a long wagering period. A bonus counted in coins moves with the market, so its real value on the day it converts can differ widely from the day it was granted. Wagering targets and maximum bets follow the same unit. The bonus terms name the unit, often in a single line under the headline figure.
Casinos show crypto balances in one of two ways. Some keep the balance in the coin itself, so its value in everyday money rises and falls with the market. Others convert each deposit into a traditional currency on arrival and show that figure, which freezes the value until withdrawal converts it back. The account settings or the cashier page state which approach applies, and the difference decides who carries the price risk while funds lie idle.
Noting the coin amount and its value when it moved is the only reliable way to see how a period of play really went.
Yes, when a balance is converted in both directions the casino's rate applies a second time, so the spread is charged twice.
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.
Some casinos keep it in the coin, so its everyday value moves with the market, while others convert deposits on arrival and freeze that value until withdrawal.