Tether

You get:
200 Free Spins
For Wagering 5 mBTC
4.5

You get:
100% deposit bonus up to $5,000 + 80 FREE SPINS

4.5
You get:
100% Deposit Bonus up to 500 EUR + 100 free spins
4.3

You get:
100% deposit bonus up to 500 EUR
Daily Giveaways & Cashback, and if you manage to join their VIP Club, you can expect to get even more lucrative bonuses

4.3
You get:
270% deposit bonus up to $20,000
4.0
You get:
100% Deposit Bonus Up To 5 BTC
+ 100 Freespins
4.0
You get:
100% deposit bonus up to 5BTC and 100 Free Spins
3.8
You get:
A free Affiliate Chest with up to 80,000 Coins(~$50 USD)
3.8
You get:
300 Wager-free Bonus Spins
3.8
You get:
Up to 15% rakeback on all your bets!
3.8