The Viewability is the probability that an impression will be seen by a user.

Viewability is expressed as a percentage between 0 and 100, and is calculated as the percent of viewable impressions compared to measured impressions. 

Viewable impressions are defined per the IAB standard metric:

• For display inventory: 50% or more of the creative on screen for a continuous 1 second or more
• For in-stream inventory: 50% or more of the creative on screen for a continuous 2 seconds or more

Ad360 Web Console lets you set a Minimum Viewability Rate for your Menadex Line Items.

If Ad360 receives a Bid Request for an impression with a Viewability Rate below your Minimum Viewability Rate, we won't bid for it.

This ensures that all impressions that we bid for, and therefore win, will have a greater viewability rate than your Minimum Viewability Rate.

Note that choosing a low Minimum Viewability Rate value may reduce the amount of available impressions that Ad360 can bid for, and therefore potentially reduce the campaign's delivery.