The XP Fading system is a way for us to reward the Artists that has consistent fanbases and to accurately assign Artist Levels to everyone.
In our Leveling system, we rank the Artists based on the number of XP Points they managed to grab over a period of 10 weeks. This is constant and, every week, the system is always taking into consideration the 10 weeks previous to the current one.
The "fading" aspect is related to the fact that the XP Points you receive recently are worth more in comparison to XP Points you received in previous weeks. When visiting your Artist Hub and going into "Activity" > "History", you can see the "Weight %" of any of the previous weeks, which tells you how much the XP Points received in that week are contributing to your current amount of XP Points and how much of it has already faded.
The XP Points you received over the last two weeks contribute in their entirety to your totals, and XP Points received before that has a fade applied according to how long ago you received it. You can always check your "History" to see detailed information about this.