Which broker charges the lowest flat brokerage fee?

Edelweiss, a full-service broker, charges the lowest flat brokerage model at Rs. 10 per executed order brokerage fee across segments. Here it is to be noted that the investment in shares with edelweiss is not free and levies at Rs. 10 flat brokerage. However, Paytm Money, a discount brokerage firm, offers an Rs. 10 fixed pricing model on all intraday and F&O trades and offers free delivery trading at Rs. 0 brokerage.