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Swap Deals work within the billing system using the information on rates and current statistics. There is a separate service in System → Task Scheduler section - Swap Deals Manager. This service operates updates each Swap Deal maximum once an hour. It monitors the current statistics and updates the Swap Deal information putting a timestamp of the latest changes to the Update Time field in the General section of an Items List tab.

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From Events Log, you can configure it so that Swap Deals alerts will be sent to your mailbox upon occurenceoccurrence. Learn more about how to set this up here.