From what I know, no ,there is no limit to the max amount of any currency (except maybe Casino Caoins, but that may have been removed at one point). Alliance points have a weekly cap of how many can be earned (4500 per member), but no limit to how much can be accumulated.
Thanks, this is great info!
I was mostly concerned about SG points because I have a bunch of tickets to get more SG and didn't want to use them if there was a cap some other way.
Seems like the devs really thought things through!