In a modern casino, the cage is the main cashier: a secured counter where players exchange money for chips, cash chips back in, collect larger wins and arrange credit or markers. It sits at the centre of the casino’s cash handling, alongside vaults and count rooms, and is watched closely by security and the eye in the sky.
The word has an older meaning too. A cage, or birdcage, is the hourglass-shaped wire container that holds three dice in chuck-a-luck; the operator turns it over and players bet on the numbers that come up.
If someone asks where the cage is, they almost always mean the cashier. Online, the cashier page plays the same role, handling deposits, withdrawals and identity checks, which is why operators treat payments and KYC as one connected flow.