The RTP payout average depends on the type of casino game you are playing. Blackjack has a high RTP payout percentage compared to many casino games. However, you will only stand to win small payouts. RTP values 98-99% are considered generous payout at an online casino, especially in slot games. Slots with RTP payout percentages of 98% or above are good value, as the average RTP is around 96%.