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Bithumb is a cryptocurrency exchange that is based in Seoul, South Korea. The platform was founded in 2013. It allows users to buy, sell, and store various cryptocurrencies. In South Korea, Bithumb is one of the largest exchanges, and it boasts some of the biggest crypto trading volumes.
Trade.io (currently (TIOmarkets) is a centralized trading platform. In October, 2019, the Trade.io exchange suspended its operation and rebranded in TIOmarkets to be able to provide more markets, such as forex, shares, indexes, metals and cryptos. 
CoinJar is an Australian online exchange. The company was founded in 2013 and is registered in England and Wales. CoinJar is also registered with the Australian Transaction Reports and Analysis Center.