What Is Smart CPM?
Smart CPM is an automated CPM bidding mode.
When creating a campaign, you set the maximum CPM you are willing to pay. The system then participates in auctions automatically and attempts to buy traffic at the lowest possible winning price. The system never exceeds the CPM limit you specify.
Depending on auction competition, the actual CPM may be lower than your maximum bid.
How Smart CPM Works
Smart CPM uses a second-price auction logic.
Example:
Your maximum CPM bid: $5
Competitor bid: $2
With regular CPM bidding, you would pay your full bid amount. With Smart CPM, the system purchases the traffic at a price slightly above the competing bid instead of charging the full $5 CPM. This allows campaigns to remain competitive while reducing unnecessary overspending.
How to Enable Smart CPM
Step 1
Log in to your HilltopAds account.
Go to Manage Campaigns → Add Campaign
Step 2
Select the Popunder ad format.
Smart CPM is currently available only for Popunder campaigns.
Step 3
In the Type section, choose Smart CPM.
Step 4
Set your maximum CPM bid.
This value acts as your maximum auction limit. The system will not exceed this CPM.
Step 5
Configure the rest of the campaign as usual
Launch the campaign after completing the setup.
Once active, Smart CPM will automatically optimize bidding within the auction.
Summary
Smart CPM is an automated bidding model for Popunder campaigns in HilltopAds.
Key features:
automated bid optimization,
dynamic auction pricing,
maximum CPM protection,
reduced manual bid management,
improved budget efficiency.
To start using Smart CPM, create a Popunder campaign and select Smart CPM in the campaign type settings.