The Aztecs traded crops such as beans, corn, pears, squash, tobacco, cotton, tomatoes and peppers as well as turkeys, feathers and blankets. Because they didn't have a monetary system in place, the Aztecs bartered with goods.
The Aztecs had gold, but rather than assigning it a monetary value and using it in trade, they used it for arts and architecture. Cocoa beans were valuable, however, and they often used them in place of coins. The Aztecs bartered using other goods as well.
Pochtecas were long-distance Aztec traders and were considered their own class. Because the Aztecs didn't have pack animals, they transported their crops and other goods by canoe to and from Tenochtitlan.