Learn more about MRAID from the IAB.
In addition, Google supports the IAB's Open Measurement SDK.
Respond to bid requests with MRAID creatives
You can bid on any request with an MRAID creative as long as the bid request does not specifically exclude the MRAID creative attribute
MraidType: MRAID. In OpenRTB, we send the Banner.api signal, where APIs 3, 5, and 6 correspond to MRAID 1, 2, and 3.
If an app publisher does not allow video interstitial ads (in other words, display-only interstitials), the SDK will automatically add a close button regardless of the use of MRAID
useCustomClose(). You can check whether an ad slot is a video-allowed interstitial based on whether the video message is included in the bid request.
You can learn more or see detailed examples of SDK functionality in the Google Ad Manager Help Center.