There are four in-game currency types in Apex Legends that can be used to purchase cosmetics or unlock legends: Crafting Metals, Legend Tokens, Apex Coins and Event currency.
Crafting Metals
Crafting Metals may be used to directly purchase cosmetic items, such as legend or weapon skins, banners, or stat trackers. They can be acquired from opening Apex Packs, where you can get 15, 30, 200 or 600 Crafting Metals depending on the rarity.
Costs
Legend Tokens
Legend Tokens can be acquired by leveling up and are used to unlock legends, purchase variants of legendary skins for weapons on the Store and reroll your daily challenges. You get 600 for every level, even after max level.
Cost for Daily Challenge re-rolls are:
The cost resets every day.
Apex Coins
Apex Coins are the premium currency that may be used to purchase Apex Packs, items in the event store, featured skins, or legends on the Store page. These can be only purchased with real world currency. 1,000 are provided with EA Access or Origin Access.
Event Currencies
Crowns
The currency used on the Iron Crown event store, Crowns can only be obtained by doing the event challenges or opening the event-specific Apex Packs.