A bit of insights that may be helpful about HBD

HBD has had a 20% savings interest for quite a while now ... the savings rate is voted by the witnesses and we have seen such a consistent stability of the asset during all the ups and downs of the market and that why we have kept it at that rate.

There are some strong safety dynamics to the Hive backed dollar... that do really well and avoid some problems other backed currencies have.

The main marketplace for the token is the hive/hbd pair and best interface is https://hivehub.dev/market/advanced

If you're looking at other markets or coingecko they'll usually be off in their assessment of the value of HBD because they don't look at the trading going on for hive/hbd pair.
HBD does have a bit higher fluctuation but always comes back to right around $1

You can also do a blockchain transaction from hive to hbd which uses a 3.5 day median to convert so you'd need to convert whatever assets you have to HIVE most likely to get it over to HBD. (this safety feature of the Hive backed Dollar is both frustrating because of slowness but brings huge safety to HBD)

Asking what it's market cap is not maybe the best... the answer is... not enough. That's part of the thinking for increasing the interest on the savings account. Increase the amount in existence. However also it's backed by HIVE so there is a limit to how much there can be in correlation to HIVE... HIVE itself would have to go up in price for there to be a lot more of it in existence.

Also there is an issue with the proposal in thinking the dao can withdraw every day and convert to DEC. It's a every 30 day sort of thing. Which is fine... and maybe they can run a script that does the converting every day.

I think someone is gonna have to create a script. My suggestion is that the dao claims their savings interest HBD each 30 days reinvests one half then sends the half of HBD meant to burn DEC to another account (safety) with a recurring transfer and then exchange for HIVE in the internal HBD/HIVE market. Then it will have to convert to swap.hive which has a fee. Then uses the trade market or DEC/swap.HIVE pool... then has a burn.

I assume someone can make this sort of script with not too much effort but should probably be done not with the main DAO account. I mean it's not easy and there are some fees but a good dev will figure this out splinterlands has some devs that are witnesses and know Hive pretty well.