There are many exchanges which allow users to trade using INR. Amongst all, I feel Airfio has a very user-friendly website and their UI is very clean. Their customer support is the best part whenever I had an issue they resolved within an hour. For trading Bitcoin with INR you can use Airfio - Buy and Sell Bitcoin in India. It is easy to use for newcomers in crypto industry with the lowest transaction fee, an efficient support function. For buying bitcoin with INR or sell bitcoin I suggest you this Peer-to-Peer bitcoin exchange !! Their transactions are in a time-bound manner. If you have any doubts please reply here.