I happen to have 200mill on US that I dont need at all. On EU on the other hand, i dont have so much and im mainly playing EU. So i was wondering if its allowed to trade gold cross servers?
In that case; I have 200mill on US that id like to trade for gold on EU.
I don't think there are any rules that forbid cross-realm Trading.
But do keep in mind, that there's no guarantee that you won't be scammed, since the trades can't occur simultaneously (unless you have 4 accounts to work with) and with the safety measures of the Trade Window.
I'd look for very trustworthy people to make such a trade.