Cryptopia exchange was closed after a theft that took place in early 2019. Cryptopia was established in New Zealand in 2014. Its website had been publishing updates on the liquidation process until the mid-2019.
Aidos Market is a cryptocurrency exchange created with the goal of making cryptocurrency trading easier and more reliable. The Aidos Market don't charge any fee for listing coins and will only list the ones with potential, unique tech and business plan.
Exrates is a crypto exchange that was founded in 2016 which makes it an older crypto exchange. There is not much information about the founders but the site reveals that it is registered in Estonia under a company named DexTechnologies OU.