What is a good fill rate for mobile ads?
Above 95% is healthy for banners and interstitials; 70–90% is normal for rewarded video. Fill rate is filled ad requests divided by total ad requests. Low fill usually has one of four causes: a geography with thin advertiser demand, an eCPM floor set too high, a single network with no mediation behind it, or an app category advertisers avoid. Rewarded video legitimately fills lower than other formats because its inventory is scarcer — that is not a fault. If banner fill sits under 90%, add mediation before you touch anything else.
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