The guys at FX live quote some big orders in the market and...

The guys at FX live quote some big orders in the market and options of interest. A big one like 500mil to $1bil can sometimes be a magnet. The big boys who have that money can see the depth and if its worth spending $200-500mil to hit some stops or get through the depth to hit the strike price they will. There is no volatility of interest they go off at 10am NY time.

https://www.forexlive.com/orders/!/early-heads-up-to-forex-option-expiries-for-thursday-20180815

Index expiry is different with a whole bunch going off in order from A-Z so no idea where the price will end.