Right, understood now, and thanks for the detailed explanation. I think most of us (me included) were mistaken about compounding (once per month as it happens once you claim) vs accruing which as you say (and it makes sense) happens per each Hive block.
That means that people that add more HBD into Savings during the month, should have a bigger accrued interest at the end of the month.
RE: HBD stablecoin - Is the 20% APR compounding interest daily or monthly?