These are the top 15 paying online slots. Find out which online slots offer the highest return to player percentages and increase your chances of winning!. You can also see a shortlist of the very best real money online slot sites below. . see the payout history of the best progressive slots online so you can choose. How to find loose slots? Here we will give main guidelines and tips on how to find the loosest slots in any online casino. The knowledge on how.