Quote from late apex:
Exactly. Put another way, Oanda's de facto initial margin is 2%, maintenance margin -- 1%. The position will be closed automatically, via a margin call, after several platform warnings, when half (rather than all) the money is gone.
For instance, with a $10K account, the most EUR/USD one could buy or sell right now would be $10,000 x 50 / 1.2280 = EUR 407,166 (USD 500,000). If that's your only position, at $40.72 a pip, it would take a 123-pip ($10,000 x 0.5 / $40.72) adverse move against you to get a final margin call and get that position closed.
IMO, the vast majority of forex traders would be far better off with 50:1 max leverage, if that, rather than 100:1, 200:1 or (saving the "best" for last) 400:1. Professsional currency managers rarely, if ever, exceed even 10:1.