I have to say, without any lies, that StartApp has an average ecpm (those two lasts months of July an August) of 0.50-0.60$. I know thas in the past was better, but it depends on who uses your app (USA or Brazil, for example. USA will be higher and Brazil, lower).
Here is my experience with startapp full detailed with email screenshots, They seems like intelligent scammers, Don’t go for it
My Experience with StartApp Ad Network (With Email Proof) ? Keralamedia.Online
Hi, recently we compared Epom Apps and AdMob in terms of fill rate, rates, demand, and payouts —> Global Ad Network for Publishers and Advertisers - Epom Market
This article will be useful if you are looking for AdMob alternatives.
Good luck