We've opened up to our new Trading plugin which allows for mcMMo, XP, Money and items to be traded between players across our servers. The plugin is open up for Factions, Skyblock and Prison which you can use without the hassle of potentially being scammed out!
/Trade - Shows all possible commands and information
/Trade [playername] - Sends trade offer
/Trade accept - Accept to currently pending trade request
/Trade deny - Refuses trade request
/Trade block [playername] - Blocks trade requests from player (per user)