Just had a quick skim through the nights posts, so apologies if this has been already said
On the 'circuit breaker' idea - to implement it based on hard limits, eg '10% drop in an hour' / '20% from high' sounds fraught to me. Whatabout 'when we run out of liquidity on Stamp' - that after all, is the crux of the matter surely?
Also, big red banners on the top of the screen are good. Keeping the announcements page up to date would be a small but easy thing, no? C'mon, I know you were busy yesterday but a little announcement update wouldnt have taken 5 minutes (and if it did, then invest a days dev time in a little bit of CMS)
just my 2p