Most international cruise lines use the US Dollar as their onboard currency. Upon boarding, you will link a credit card (Visa, Mastercard, American Express, etc.) to your cruise card. The ship operates on a "cashless" system, meaning all onboard purchases (dining, drinks, shopping, service fees) are charged directly to your account and settled at the end of the trip. While you don't need large amounts of cash on board, we recommend bringing some small bills (USD or local currency) for minor expenses and tips at ports of call.