Underlying "How much do casinos pay out?" 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 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.
Every conversion uses a rate, and the casino's rate is rarely the market price. A small spread between the two works as a hidden fee, charged once at deposit and again at withdrawal when a balance is converted in both directions. Comparing the rate on the cashier page with a public price at the same moment shows its size. On frequent small deposits the spread can cost more than the network fees do.
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 regular 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.
Yes, when a balance is converted in both directions the casino's rate applies a second time, so the spread is charged twice.
Noting the coin amount and its value when it moved is the only reliable way to see how a period of play really went.
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.
Coins kept there between sessions carry both price risk and account risk, so moving out what the next session does not need limits both.