Platinum is an in-game currency which can only be bought with real world currency. It comes in packs of various quantities and they can be purchased on the Official Warframe Website.
It can be used to purchase Warframes, weapons, consumables, sentinels, Mod packs, and other various items from the in-game Market. It can also be used to instantly finish crafting wanted items in the Foundry.
Additionally, for a short period of time, players can upgrade their account with founder's packages. Not only does this support the developers, but it also rewards the player with hefty platinum bonuses at a much discounted price as opposed to buying platinum for cash from the market. See The Founders Program for more information.
The game uses an optional payment system: all weaponry and warframes can be earned in game. However, with platinum, the grind to obtain weapon and warframe blueprints and their resources is circumvented. A player can purchase weaponry from the market for credits, although some weapons and all warframes require the schematic to be purchased, and then crafted. There are only a few items that can only be obtained through platinum: Color Palettes, Warframe slots, and Weaponry slots. Slots directly influence gameplay by allowing for a player to keep different weapons and warfames in order to create different sets. If a player has filled all his weapon slots, and/or maxed out a weapon to level 30, he will have to sell one of his weapons/warframes for credits and free up a slot. The other slots available may be filled with alternate frames (up to two) or weapons (up to six) that are better suited to taking on a particular enemy set.
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