They made tons of listings of ebooks(hence the name Ebook101) with negative prices and made dozens of buyer accounts and started buying ebooks. Apparently market was poorly coded and they were doing this for days until Thomas realized it. Ebook101 just got lucky no hacking skills needed.
AB shills I heard you were getting free coins, try this method as well for some free coins trolololol
Kidding aside, market owners double check your market's code for such a stupid things not to happen again.
yea you AB and your API lol
wait, what? negative prices, like no input sanitizing? seriously... LOL