Can I trade money between servers?

I mean, I have a character in the server Shilen and want to move this money to the server Naia.



Can i use another character?



My characters : A(Naia), B(shilen)

Another person characters : C(Naia), B(shilen)



The character A gives a 5 adena to character C and character B gives 5 adenas to character B.



Is this ilegal?