4Game

https://tankrewards.eu/

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There are four "tiers" of rewards:

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1. For 225 points: booster pack (4-6 personal reserves + 10% off coupon for premium shop)
2. For 560 points: supply pack (1 piece of equipment + garage slot + 15% off coupon)
3. For 710 points: blueprints pack (12 national and 40 universal blueprints + 20% off coupon)
4. For 975 points: tanks (T14, M4 Improved or RAM II)

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IMHO: You can acquire max 70 points daily (in a whole month) so these are not high requirements. For many people most attractive will be blueprints pack as it's not something you can buy or get easily in game. Tanks are not available for purchase at the moment but they were many times in the past.