This tool helps you set up a custom bid for placements and countries to increase traffic from sources that perform good or decrease it from those that don't.
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You can find Custom bid in the Advanced settings section (on the Create campaign page).
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Custom bid is valid for all pricing types and Ad Units.
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Users can add one or several placements separated by commas, one or several countries separated by commas, and set a separate bid for them.
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Also, users can delete any of the lines or change the cost using the Edit button.
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There are no restrictions on the number of placements for which a user can set custom bids.