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As i researched, below are the MCX/Commodity brokerage charges in India,

Zerodha - Rs 20 per order (Unlimited lots)
RK Global - Rs. 9/-* per lot

ICICIDirect 0.1 %
Sharekhan 0.1 %

Gold is the most active commodity Futures thats traded. Anyone trading in commodity futures, pls share the brokerage rates on it.