Poko
From Colonia Wiki
The Colonia Economy uses the poko as its official currency. Players may buy or sell materials and items at various stores throughout Colonia. Formerly, Colonia used the Emerald.
You can exchange Pokos for emeralds or vice-versa at ATM's conveniently located around the world. If you need an ATM installed, contact Mine Ops.
To create a chest shop:
Hold shift and left click on a chest with the item you wish to sell. Follow the text prompts to complete setup.
To create a BUYING chest shop, do the same, then right click and switch it to buying mode.
To purchase from a chest shop, left click on the chest and then follow the instructions in chat.