OKEx was founded in 2014 and are currently based in Hong Kong. OKEx offers a volume-based maker-taker fee. Please look at the link for the fees as they vary depending on your volume.
HIT Solution Ltd aka HitBTC is a cryptocurrency exchange operating since 2014. HitBTC is registered in Chile. The trading fees are 0.1% for takers and makers earn a 0.01% rebate.