Cryptopia, the last known exchange active for this coin announces:
NoConnections - Due to extended periods of time with less that 5 connections GBN has been scheduled for delist on the 06/09/2017, please close all open orders and withdraw before this date.
Do you know any other exchange active for this coin?
Yep, sad story. I think that the easiest add process it's on Nova and there are markets pairs like MOON and ESP2 that can help to trade GBN.
Vote for the coin you want to see on Novaexchange
How does it work
Every user gets ONE FREE vote every day, resets 00:00 GMT+1. Any more votes on the same day costs 10 NPOINT, you can vote as many times you want and NPOINT is traded here: BTC_NPOINT market. Buy now costs 0.9 BTC and will add remaining needed votes immediately to the coin and end the vote, to get the coin listed without delay. 250 votes and we're in (or paying a little
)