For what you are accepting coins? Like what I can buy with them?
Therefore, I'm happy to announce that the forum is now accepting grin payments automatically, probably the first site other than exchanges to do so.
You'll find a link at the bottom of the evil-fee and copper-membership pages.
I'm not sure about Donator ranks, but i really doubt you'll be able to buy those with Grin yet.
So there is nothing like atomic swap kind of things going on between the grin coins and the other coins? That I was thinking.