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When are maintenance windows?

Every Tuesday, 4am–6am ET is a recurring weekly maintenance window.

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What happens to open orders during maintenance?

All open orders are canceled before maintenance begins. Leaving resting orders on the book during maintenance would expose traders to stale fills when the book reopens.

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What happens to connections during maintenance?

Connections are rejected during maintenance. An explicit rejection is preferable to leaving connections open but non-functional.

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When do markets reopen?

Connections are re-enabled first, then markets move from SUSPENDED to OPEN. The state change signals that maintenance is complete.