I am not sure whether nanex.co exchange supports Cryptonote algorithm or not, but this one is young, free listing fees. You should ask them for detailed listing requirements and try to ask for listing Bitsum on the one.
Hope my link help Bitsum to be listed on one more exchange.
https://nanex.co/exchange/BTCNANO

Additionally, recent days, we only saw direct buy orders. That's strange price orders on Stocks.exchange.
https://stocks.exchange/trade/BSM/BTC