ATM there are bunch of them: legacy 25%, char perk upto 10%, 100% from boost and 100% from x2 event, guild 10% and some% for winning state(idk how many).
I just noticed that my toon not in guild have more RXP in description of OP weekly reward, than my char in guild - like 149k for non guild and 147 for in-guild one. Both in one legacy, subbed acc, both RXP boost applied and perk maxed to 10%, both DS aligned at LS domination.
Checked some other rewards and found that difference depends of reward size - for ~30k dailies it is +2k for in-guild toon, for ~98k MM uprisings it just +500 points and for bigger rewards - non-guild toon starting to have more points than in-guild toon...
And noticed one more thing - rewards come in 2 parts according to chat log. And they are changing different ways for in-guild and non-guild toon. Guild 32k comes like 28k+4k and non guild 30k = 25k+5k.
How is all that?
TL;DR: is there exist some math formulas\tables for RXP like for stats and comp gifts income? If yes - links will be greatly appreciated!