^ I confirmed there is, just because I was there before when I was participating in the Wolfbet signature campaign, they had a 7-day streak reward, come back each day and you will receive 0.00000090 BTC.
I just checked it, and it seems the award is 0.01 USDT, not 0.00000090 BTC. I didn't claim it and will try it again later. Maybe USDT is the defaut currency in my account for some reason. Are there any other requirements except just visiting the site once a day to receive those rewards? Can you play with the 0.00000090 BTC instantly, or do you have to wait for 7 days to be credited with the coins?
You have to do nothing like ‘panjul07’ said above but you need to enable 2fa at your account for claiming the reward. It is like a progressive faucet where you can receive the amount only one time each day. And the amount will gradually increase each day (upto 7 days) if you claim it continuously. After 7 days it will start from the base amount (day 1 amount) again. If you miss to claim the amount at any day then it will start from day one amount as well. Currently, day 1 amount is 0.01 USDT. But I don't know how much it will increase at every day.
You can play with the amount instantly after claiming it. Seems like they have made USDT as fixed reward for everyone. Users were able to claim the reward at any coins in past, I don't have any idea when they made this change.