Their company blog states:
From July 10, 2014, the commission on deposits made with WebMoney is 2.5%. However, until August 1, 2014, when you make a deposit with WebMoney, Alpari will refund this 2.5% back to you!
Please note that WebMoney will charge an additional 0.8% commission (max 50 USD / 50 EUR) on top of each transaction.
Obviously, in the current low-volatility & low-volume environment, retail FX brokers are pulling out all the stops to fight for every client deposit and every client trade, even if it means offering a tiny refund such as 2.5% on a certain deposit method. Alpari RU especially has been hit by the low volumes bug, with their May volumes below $100B at multi-year lows, although we haven’t yet seen their June figures.