I will recommend you brave browser it will give you bat token for every friends you refered to use it atleast 1 month .

  Blade platform there is also a refferal program that will give you free adbank token you just need to download the chrome extension and for every ads you see while brosing you will recieve free adbank token monthly . And the refferal commision as i remember is 10% of the income of the friends you reffered.