Groww follows a flat fee model. It charges a lower of Rs 20 or 0.05% of trade value as the brokerage for equity trades (intraday and delivery). The minimum brokerage charged by the broker is 0.05% of trade value and the maximum brokerage charged is Rs 20.
For example, if you buy 100 shares of ABC Ltd. at Rs 500, 0.05% of the trade value comes to Rs 25. Since the brokerage charged by Groww is lower of Rs 20 or 0.05%, you are required to pay only Rs 20 as the brokerage for this transaction.
Let's take a second example wherein you sell 100 shares of XYZ Ltd. at Rs 50, 0.05% of trade value comes to Rs 2.5, thus in this case you are required to pay only Rs 2.5 as brokerage as it is lower than Rs 20.