The only currency that flows across the network is the NatureCraft Gem, which can be obtained at the moment through playing on the server, voting and/or donating to the server. By using Gem you can obtain certain premium perks, equipments, and/or decorations. Since NatureCraft is not a pay to win network, every gameplay related items purchasable through Gem can also be obtained by normal playing.
Terra uses Terra Esssence as the server currency. The currency in the future can be exchanged to gem with an undetermined and most likely fluctuating exchange rate. Terra Essence can be obtained from engaging the player/server econ, sieging and conquering other towns, as well as RPG activites.