The return to player (RTP) is generally referred to the amount of funds, which the credible online gambling locations pay out to the users. In casinos with the most responsible attitude to their activities, this rate is between 83% and 95%. As a rule, this index is calculated based on the period of time taken and the sums paid out. Thus, generally, the RTP is based on the amount of funds which a platform pays in total to its gamers per unit of time.