April 21, 2021 was 250.93 MvB, but I don’t think that was the actual ATH. I think the ACTUAL ATH was in January of 2018, but data that far back seems to be different for every source I see.

But there was about a 4 month period of a clogged mempool with a bunch of peaks in early 2021, and before that, barely anything since December 2017/January 2018 which was the highest it ever was.

Will try to figure out more specifics though.