I have Google AdSense. Can I skip your screening process?
Even though Ad Exchange is a premium version of AdSense, they are two different products and have differences from one another (i.e. Supported Languages). Thus, screening the sites submitted to is being done. The sites need to be assessed to see if they are AdX ready. You can read more about the difference between Ad Exchange and AdSense on this link https://support.google.com/adxseller/answer/4599464?hl=en