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BITBOX is a Singapore-based cryptocurrency exchange launched in 2018. The team behind this platform is better known for a different project — messaging app LINE. The exchange is not available for the American citizens and doesn't support fiat money yet, but allegedly these problems are going to be addressed in the future. The trading volume is relatively low on BITBOX. By all valuations, this exchange ranks below the 100th position.
An UK-based ExtStock exchange was established in 2018. It provides trading facilities for scalping as well as high-frequency trading. 
Actionable digital currency trading platform.