You now have the ability to manage your bid adjustments by device type using the Campaign Management and Bulk v10 APIs. New targeting objects have been added to the APIs to allow you to adjust the bid modifiers for each of the device types – PC, tablet and mobile. For more details on the range of values supported for each device type, refer to the release notes on MSDN.
Campaign Management API changes:
Set the device-specific bid modifier using the BidAdjustment element of the DeviceOSTargetBid object.
Bulk API changes:
Similar to the Campaign API, use the Bid Adjustment field within the following Bulk record types to manage device targeting with the Bulk API.