The effects of Opti Yield can be observed in Google Ad Manager and further analyzed in the dashboard provided to Opti Yield clients.
Of course you can. When you activate Opti Yield on your media portfolio, a dashboard is provided to give you an accurate overview. The dashboard allows you to see the additional revenue created by Opti Yield according to various parameters (device, country, media, page, etc.), unsold inventory, optimized inventory, etc.
It is also possible to create reports in your GAM to see the inventory optimized by Opti Yield, the eCPM per ad slot, with or without Opti Yield. This way you can validate metrics or see the benefits of Opti Yield independently. A tutorial is provided for Opti Yield customers to easily create such reports.