We’ve just released the 
Budget resource for the 
DoubleClick Ad Exchange Buyer REST API, which can be used to set a daily budget for your real-time bidding campaigns. Each 
PretargetingConfig will have an associated 
Budget that it is mapped to via the 
billingId. Once a 
PretargetingConfig meets or exceeds the 
budgetAmount set by its 
Budget, it will no longer receive bid requests for the remainder of the day. Additional information about this resource can be found in the 
guide.
The 
Budget resource in the REST API and the 
BudgetService in the 
SOAP API can be used interchangeably; however, we recommend that you use the REST API for managing the budgets of your real-time bidding campaigns.
If you have any questions or comments about the Budget resource, please contact us via the 
forum or our 
Ads Developer G+ page.
 - Mark Saniscalchi, Ad Exchange Team
 - Mark Saniscalchi, Ad Exchange Team