https://b2x-segwit.io/news/article/27

"Jan. 17, 2018, 6:09 p.m.
B2X is Accepted for Exchange Operations on ChangeNOW
The platform is among many new partners that supported the fork and would like to provide the purchase/sale of our coin. ChangeNOW is an anonymous and limitless exchanger offering the lowest commission among the similar platforms.

The main coins for trade on ChangeNOW are BTG, ETC, Dash, XVG, and the altcoins. "

https://changenow.io/

I don't see B2X though atm..