OKEx cryptocurrency exchange is one of ten global cryptocurrency exchanges based on daily volume (more than USD $ 1.68 million) and provides services in more than 100 countries.
OKEx adopts a maker-taker fee schedule to encourage more order placement and liquidity. Thus, the maker costs are lower than the taker costs. Costs of makers and takers start from 0.10% and 0.15%, respectively.
Furthermore, there was great fear in September 2019 when Twitter user Whale Alert discovered that more than USD $ 270 million was sent from Exchange to an unknown account. This prompted OKEx's PR head, Jennifer Chow to use Twitter to confirm that it was only a maintenance of purses that were regularly scheduled. Nobody appeared on the occasion and said that they suffered losses as a result. So it can't be hacking.