UPDATE 07.06.2019

Now, we have ratings on 24btc.io

When your forecast wins - you earn rating.
Rating shows, how you accurate in Bitcoin predictions.

When your forecast wins 5 times or less - you earn 1 star.
10 times and less - 2 stars.
24 and less - 3 stars.
24 and more - Medal.

Besides the rating shows your forecast accuracy, it will also reduce the cost of your bets and fees later.
Good luck!