Doesn't seem to include Cosmic trinity's current 5x XP multiplier for example. I can imagine Rank-up doesn't support multiplayer, at all, but it's something to consider.
I noticed the results returned a dungeon with a 1/2 cost Stamina when in fact it is 3x Exp. The dungeon returned was Dragons of the Tower in Tower of Giants. Your incorrectly returned a result I could not play because I only had 3 Stamina but it still required 5 even though your site assumed it was 1/2 cost.