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Energy Potion it is used as the currency in the game. You can get it from doing your missions, weekly rankings, as well as selling things in auction. And I think you might be able to get it through Events not sure on that though.
there are 2 types of EP. the EP that you can use/trade/sell/gift is listed as Energy Potion. these need to be purchased with real cash ($1) but can be awarded from the game (rarely)
the EP only you can use is listed as MY Energy Potion. build these up and use them only when necessary
the is also EP 100 which refills 100 energy points
BP is the same
some advice don't start using EP of any kind till level 20-40 cuz you'll most likely level up and waste it . also when doing missions pay attention to how much energy you have there have been at least 5 times that i've used an EP/MY EP on accident.