Fluctuating eCPM and Fill Rate values

Hi there,

My app has gone live with Corona ad and after an initial blip on Corona’s side ad’s now appear to work as expected - however I’m still a bit confused with regards to fill rate and eCPM values.

I’ve been checking daily (usually to get a cumulative total over the past 7 days) and I’ve noticed that my fill rate and eCPM value seem to fluctuate quite widely from $0.37 to $0.91 for my eCPM and 38.91% to over 90% on fill rate and whilst my revenue is increasing I’m sure I saw it drop back a couple of dollars before climbing back up.

Can someone offer any insight as to why this happens and how to best maximise my eCPM and fillrate?

Regards

Jon…