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At 9:30am New York time, US stocks open. Currency markets often respond, particularly pairs sensitive to risk sentiment like AUDUSD, USDJPY and USDCAD.

Futures trade before the open, so much of the move is visible beforehand. The cash open still brings a surge of activity and sometimes a reversal of the pre-market trend.

For forex scalpers, the half hour around the equity open often features higher volatility and sharper reversals. Correlation between equity moves and currency moves can briefly strengthen.

Some traders keep an index chart on a second monitor to see the equity picture while trading currencies. A sudden drop in index futures tends to bring yen strength and AUD weakness within moments.

Others avoid the window entirely, finding the whipsaw too costly.

Both approaches are valid. The mistake is being surprised by the activity.

Is the equity open part of the trading window here, and has it helped or hurt?

I traded the equity open on USDJPY for about six months and ended up keeping it, but only after changing how I approached the first ten minutes. In the early weeks I tried to trade the initial move and got chopped up badly. Futures would push one way into the bell, the cash open would reverse it, and then the original direction would often return before ten o'clock New York time.

What worked better was keeping an S&P futures chart next to the yen pair and doing nothing until the first fifteen minute candle on the index had closed. If the index then broke that candle's range, USDJPY tended to follow within a minute or two, and that lag was enough for an entry with a stop under the yen pair's own swing.

AUDUSD was less reliable for me than the yen, and USDCAD was mixed because oil often mattered more at that hour. If you want to try it, I would pick one pair and keep a log of the index range break versus the currency's reaction for a few weeks.