Starting January 12, 2027, Microsoft Advertising will remove access to the MaxCpc field in the API for new campaigns and existing campaigns that do not currently use it.
Advertisers relying on scripts, bulk uploads, or bid management tools using MaxCpc should review their setups ahead of the deadline. Dormant usage will not be grandfathered, so simply having used MaxCpc previously will not preserve access.
The change applies to both individual campaigns and portfolio bid strategies. Advertisers should audit any integrations that depend on MaxCpc and prepare to update their bidding workflows before January 12.