Maintenance and Pauses - API Documentation

Scheduled Maintenance

Every Thursday from 3:00 AM to 5:00 AM ET, Kalshi runs scheduled maintenance. During this window, a trading pause is in effect. In rare cases, a more intensive maintenance may require a full exchange pause instead. Clients should be prepared for session disconnections during this window and reconnect after 5:00 AM ET.

Trading Pause vs Exchange Pause

	Trading Pause	Exchange Pause
When	Every Thursday 3:00–5:00 AM ET	Rare; during scheduled maintenance if intensive work is needed, or unscheduled if Kalshi has a temporary outage
Place / amend orders	No	No
Cancel orders	Yes	No
Resting orders	Remain on the book (unless CancelOrderOnPause is set)	Remain on the book (unless CancelOrderOnPause is set)

If an exchange pause occurs outside the scheduled Thursday window, it indicates a temporary Kalshi Exchange outage.

CancelOrderOnPause

When placing an order, you can set CancelOrderOnPause to control whether the order is automatically cancelled during either type of pause.

Value	Behavior
true / Y	Order is automatically cancelled when a trading or exchange pause begins
false / N (default)	Order remains resting on the book and resumes when activity reopens

Set this field on order creation:

REST: cancel_order_on_pause field on the create order request
FIX: Tag 21006 (CancelOrderOnPause) on New Order Single (35=D) messages

​Scheduled Maintenance

​Trading Pause vs Exchange Pause

​CancelOrderOnPause

Scheduled Maintenance

Trading Pause vs Exchange Pause

CancelOrderOnPause