Clan wealth is accumulated as members of the same clan open gift chests.

Every 6h 30m any player ranked “Superior” or higher can send all clan members unique rewards in the form of wealth chests. Their level depends on current clan wealth, however, the reward will not only include the chest for this particular level, but also for all previous ones. That is, if your clan wealth reached maximum level, then each of your allies will get six chests - one of every quality for each wealth level achieved.