After 1610 each day click on the ‘trades’ tab of your brokerage...

After 1610 each day click on the ‘trades’ tab of your brokerage platform. You will see trades made at 1610 are marked with CSPA. This is a single match out that happens at 1610 between all over lapping buyers and sellers at an algorithm derived price. You place your orders between 1600:01 and 1609:59 and then the auction happens at 1610. It can be a great way to get a good deal if you understand how the algorithm works. Also, as proven here on BCN it’s a way for people to manipulate the price down (or up) by a single pip