Currency Exchange needs a failsafe, just lost 350 exalted orbs

First time using Currency Ex (Alva) and decided to trade an extra Faded Crisis Fragment. I thought it automatically set the orders at the market rate, no it does not. I unwittingly traded 1:1 (which I now learned is always the default) when the market rate was 350:1
Needs to be a failsafe that lets you know you're about to literally give away something valuable for near free, especially for new users.

Sorry to hear that truly, Innocence be with you Exile.

I've almost borked myself a few times by not manually adjusting the currency exchange rates, definitely easy enough to do.

i'm pretty sure there's a warning window telling u that u'r selling something under its current value, happened to me twice when i clicked by mistake, and it pretty much works