Swastika Investmart gives Span Margin file on a daily basis. It lets you check comprehensive margin requirements for NSE/BSE futures, options and currency segments. It also gives the margin requirements for commodity segment with MCX and NCDEX.
SPAN margin stands for Standardized Portfolio Analysis of Risk (SPAN). This is the most used margin calculation method which is recognised by most future and options (F&O) exchanges around the world. SPAN is based on a worldly set of algorithms that calculate margin according to a global appraisal of the one day hazard for a trader account.
Futures and Options (f&o) traders need to have a sufficient amount of margin in their accounts to cover potential losses. The SPAN system, through its calculations, sets the margin of each spot to its calculated worst possible 1-day move. The method, later calculates the margin of all positions and can shift any excess margin on existing positions to fresh positions or existing positions that are short of margin