New Exchange
https://c-cex.com/?p=mona-btc
https://c-cex.com/?p=mona-usd

MONA/BTC and MONA/USD market live on https://c-cex.com/ .
MONA/USD market is very interesting. But there are few orders at the moment.

other existing exchanges
Allcoin MONA/BTC https://www.allcoin.com/trade/MONA_BTC
Monatr BTC/MONA(reverse) https://monatr.jp/?lang=en
monax(*.JP ONLY) MONA/JPY https://monax.jp/
etwings MONA/JPY https://exchange.etwings.com/trade_mona_jpy

IMO, today we have 4 exchanges enough volume to trade.
I'll keep watching c-cex!