no zerodha is not at all discount broker . they charge stamp duty @ 50 rs per contract you got it right fifty rupees per contract in this sense if they aren''t charging brokerage everything is settled in stamp duty . so I don''t found zerodha useful as discount broker as its total brokerage is at par with icici or axis securities . so my friends just don''t cum to this coclusion tht it is discount broker . no its not