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Documentation Index

Fetch the complete documentation index at: https://docs.kalshi.com/llms.txt

Use this file to discover all available pages before exploring further.

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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.

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Trading Pause vs Exchange Pause

Trading PauseExchange Pause
WhenEvery Thursday 3:00–5:00 AM ETRare; during scheduled maintenance if intensive work is needed, or unscheduled if Kalshi has a temporary outage
Place / amend ordersNoNo
Cancel ordersYesNo
Resting ordersRemain 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.

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CancelOrderOnPause

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