Trade chat, also known as trade channel, is a common chat channel that only works in capital cities, the sanctuary cities of Dalaran and Shattrath City, and the faction headquarters on Pandaria, the Shrine of Two Moons and Shrine of Seven Stars. It is linked across all such cities on a single realm. This channel is intended for buying, selling, and trading of items and services, but it is often used for general chit-chat, gold spamming and guild recruitment as well.
The channel is also heavily used instead of the LookingForGroup channel, that is to recruit players for group activities, particularly instance types without an automated group finder. As of Mists of Pandaria those types are heroic scenarios, raids beyond the Raid Finder level, rated battlegrounds and arenas. Other frequent objectives include world bosses, PvP raids, achievements, reputation or item farming, and premade battleground groups. Prior to patch 3.3.0 and the Dungeon Finder, the channel was also heavily used for recruiting players to 5-man dungeonss.
Trade is usually channel 2; to send a message in Trade, type the following into the chat entry area:
/2 message .