Coss had a rough start in 2018, but they revamped their Dev team & rebuilt their exchange from the ground up. In November they released a major engine & interface upgrade dubbed COSS 1.2 on their way to a complete 2.0 revamp expected to be completed by end of Q1 2019.
Since the release of COSS 1.2, daily volume has steadily climbed from less than $1/2 a million to over $5 million. They are now also 1 of 7 exchanges certified by CCXT.
Please check out COSS & consider adding their exchange to your makets page.