Many of Applovin’s advertisers pay on a CPI (cost per install) basis, which means Applovin and you, as the publisher, only get paid when a click produces an install.
This means that when you have shown only a few impressions, a payable interaction of the users with the ads has not necessarily occurred. After more impressions and clicks are delivered, more interaction with the ads will occur, and revenue will be generated.
Sometimes this takes a few days depending on the number of clicks you have and the tracking platforms our advertisers use to report installs back to us.
In addition, after enough traffic is served, the AppLovin ad serving algorithm learns which campaigns work best on your placement and eCPM improves.