Google Ads has introduced bid caps and floors for Max Conversion Value bidding, giving advertisers more control over previously rigid Smart Bidding behavior. This new option is only available when creating a new portfolio bidding strategy, and it requires setting a Target ROAS first.
Once those conditions are met, advanced options will appear, allowing users to enter minimum and maximum CPC values.

This may mark a small but meaningful shift in how Google responds to long-standing advertiser feedback on Smart Bidding limitations.
This update was shared by Brian O’Neil.