This means he/she will get another 150 USD as a bonus. The “x” at the end means that you need to multiply this number with your deposit (or refund) amount. Note that this rate can be different at each online casino and it is possible to say that it changes between 15 – 45x.
Below, we will use the “ what is a 40x playthrough requirement at an online casino” question as an example to explain how playthrough casino system works.