@okabira Finvasia has NSE NOW with zero brokerage. But as a zero brokerage broker u can expect some limitation too. They are usually very slow in action. U need to call them frequently.
But after the initial phase, there is not much u need to interact with. Now is good except first 1-2 minutes it can give a problem. And the leverage is on lower side(BO-CO, Option writing etc) but standard for NRML and 50% for MIS, so no problem with Nifty Bank Nifty if u r using MIS.
If u r option buyer & u need to average many times, then Finvasia is best as u have min impact cost and breakeven is same per lot weather u are averaging 1 lot, 10lot or 100lots no problem brokerage always is zero.
They have lowest transaction charges also in all segments except there is 50 extra clearing charge in MCX.
Hope, I give you enough details.