Coins can be used to purchase:

• Operators. Buying characters with coins is more efficient than with credits.
  
• Days of Premium. It speeds up the game's progress and increases rewards for various activities.
  
• Customization options: emblems and camo.
  
• Emotes and animations. These will add variety to your communication with other players.
  
• Free XP. It can be used to upgrade operators.
  

Coins can be exchanged for Credits.