I couldn't sell my BitcoinX. They were too few and the exchanges that were allowing deposits were offering much less than the (expected) average.
However, from all this I can give you a good direction: https://btcdiv.com/
On the "exchanges" tab you'll find some more that accept BitcoinX deposits. However, check carefully the exchange rates, since some are misleading.
Thanks for your reply.
Exchange rate and volume are a problem (exrates volume was terrible). Bcx is still valuable in some exchanges it is possible to get about 30 USD per bitcoin. Sadly I am not able to sell it