My overall CPM and fill rate have fallen since around the start of the month. Even the publisher optimizing services like Rubicon, AdMeld and Pubmatic are all down. AdMeld is down around a 50% fill compared to 90% fill. Rubicon and Pubmatics fill are around 60%, the NET CPM is down around 50%.

The networks themselves seem to be holding up in terms of CPM, but in terms of fill, there are a lot of defaults.

Are others seeing the same too?