Q. 1. Does XPO provide any existing designs or some formats for reference or quick start?
Ans. Check out this article for different ad templates. The XPO platform also comes pre-loaded with many ready-templates for you to easily get started.
Q. 2. Does XPO support iAB Rising Star AdUnits ?
Ans. Yes, XPO supports iAB Rising Star Ad Units (http://www.iab.com/guidelines/rising-stars-ad-units/) for both Display (http://www.iab.com/guidelines/display-rising-stars-ad-units/) and Mobile (http://www.iab.com/guidelines/mobile-rising-stars-ad-units/).
Q. 3. Is XPO ad format certified for use in Google ADX/GDN(Google Display Network)?
Ans. Yes, the XPO-generated ad tag is certified to run on Google ADX/GDN as a global third-party ad vendor (https://support.google.com/3pascertification/table/4570113 and https://support.google.com/3pascertification/table/3191570?hl=en&ref_topic=3191569).
Q. 4. Is XPO expandable ad format certified for use in Google ADX/GDN?
Ans. Yes, XPO-generated expandable ad tag is certified to run on Google ADX/GDN as a global third-party ad vendor (https://support.google.com/adxseller/answer/1074250?hl=en&ref_topic=6032302&vid=1-635808941398184317-2930939970).
Q. 5. What are the approval process and creative restrictions (if any) if I were to publish it into Google GDN/ADX?
Ans. Have a look at our supported Publishers and Ad Exchanges.
Q. 6. Can I export out the creatives from the XPO platform?
Ans. No, you won't be able to because the creatives are layered with all the different mechanics and tracking.
Q. 7. Can I use the ad tag from XPO and serve it into another system?
Ans. Yes, you will be able to do this.
You may also want to look at the FAQs on Trafficking.