What is ad mediation and do I need it?
Ad mediation is a layer that asks several ad networks for a bid on the same impression and serves whichever pays most. Without it your app is tied to one network's demand and takes whatever that network offers; with it, networks compete per impression. Real-world uplift is commonly 15–40% higher eCPM versus a single network, and fill rate improves in smaller markets where any one network runs out of demand. The usual stacks are Google AdMob mediation, AppLovin MAX and Unity LevelPlay. Mediation is worth it once an app has meaningful daily volume — below a few thousand daily users, the extra SDK weight and setup cost outweigh the gain.
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