Source Optimization

Source Optimization automatically bids up or down on sources in order to reach your target CPA. The daily spend will be honored during the bidding process and a lightning bolt will appear on the campaign to indicate that it is being optimized. 

You can override or block at the source level and it will no longer automatically bid for you. 

If you want to disable Source Optimization, click the toggle button and define your default bid. 

In this case, as an advertiser, you are responsible for managing the performance of your campaigns.