It was founded in Hong Kong in 2017.
On April 11, 2018 the company announced its expansion to Malta, given the country’s efforts to provide a sound regulatory framework for blockchain businesses and digital asset exchanges.
As of 11th June 2019, OKEx is ranked 2nd exchange in trading volume, $1,487,455,872(187,964BTC). There are listed 413 crypto currencies.

[ Trading Fees ]

[ Leverage service interest rate ]
OKEx is providing leverage service ( lending service). You can borrow and invest coins when you have small.

https://www.okex.com/