Currency

The basic currency, accepted by all NPCs in Guild Wars, is gold, and its more valuable substitute, platinum. The two are automatically converted from one to the other; 1000 equals. A Vault box can hold up to, and each character can hold up to in their inventory.

Other currency
In trades worth more than, players often substitute expensive items, agreeing on a value that the item represents (that is, treating it like currency). The most common substitutes are Zaishen Keys and Globs of Ectoplasm, and, for very high value trades, Armbraces of Truth.

Acquisition
There are many ways to get currency. The most common way is picking up drops (gold or items) from defeated foes; doing this repetitively is called farming. Merchants and traders pay gold to buy any item a player can sell. Gold is given as a reward for turning in quests, completing missions, and vanquishing explorable areas. Currency can also be acquired from other players, with whom you can offer services such as running, grouping or just trading with them.

Use
Currency is used to buy items from NPC sellers in-game, who provide just about everything: basic needs, armor, weapons, skills, guild services, consumables, scrolls, dyes, runes, common materials, rare materials, and a few lesser services such as storage fees. Since other players also need these things, you can also trade them currency in exchange for something you want, or to do some task for you.

Spending currency on NPC services leads to balancing the game's economy; they are gold sink mechanisms, where currency that entered the game is equally deleted from it, preventing runaway inflation.