does anyone have information on the available level of leverage, and if there are costs related to it?
150X is the maximum leverage which you can use. Of course, if you are not a senior trader who knows exactly what you are doing, then you should certainly avoid such a high lever. However, btcc allows you to choose a level of leverage from 1x to 150x. So, it is your choice how high of a risk you are willing to take.
Agreed. 150x is indeed too high leverage, I am planning to take a lower size. Do you maybe know if there are costs related to use of leverage?