One of the developers of PHORE BLOCKCHAIN Grendel advises to use the cryptocurrency exchange Cryptobridge.
I'm not sure about her safety, so make your own decisions.
Cryptobridge is a good and safe exchange, but the daily trading volume is too small on this exchange.
I would not open an order on this exchange
I also do not trade on exchanges where trading volume is less than $ 10,000.
This is very dangerous because the order may take too long to process.