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Can you recommend some good websites/brokers for buying/selling stocks in India? 
Most of the Indian Brokers started offering API's to retail client these days. And NSE Exchange also supports algo trading at retail level. Currently two levels of API are offered. 1)Semi-automatic or one touch trading (Retail Traders) 2)Fully Automatic ( Dealers) I had tested the API with a discount broker www.tradejini.com and it is good at retail level. But to make your trading systems fully automatic you need to pass NISM Series VIII certification (Dealer Certification) and have to take dealer terminals from the broker. You also have to register as a dealer and have to take permission from exchange to run your algos fully automated. Without Exchange permission it is illegal to involve in algo trading.