Hit frequency refers to how often a slot machine produces a win. This refers to the frequency of winning on a regular basis. The average rate is between 20 to 35% without regards to the size of the payouts. It is different from RTP rate since RTP rates are calculated over a long time. The Hit Frequency does not matter whether the payout is 100 rupees or 10 rupees as long as it is a hit unlike volatility where the payout amount matters.