I have been checking stocks for margin calculator and for the available margins was disappointed to see that that too is not correct as when I try to trade couple of stocks like INDIANB and VENKEYS it got rejected. so from where can we get the correct list of stocks which are traded, coz till we actually trade I dont see any data available where we can check before hand
There is no margin calculator API. We are planning to give data for margin calculator, you have to calculate yourself.
For now you can use this https://zerodha.com/margin-calculator/SPAN/