Hi Karl,
Its not possible to determine if a campaign is limited by budget using AdWords API at the moment. This information is not available in the Campaign Performance Report. If you are using portfolio
bid strategies, you can use the SystemStatus field in
Bid Goal Performance Report to determine if a bidding strategy system is limited by budget. Please keep an eye on the
blog for any updates about this.
Regards,
Shwetha, AdWords API Team.