OKB is the utility token of OKEx, a leading cryptocurrency exchange launched in 2017. It is used for trading fee calculations, voting, governance, and rewarding users. OKEx offers a wide selection of trading pairs and has its own cloud mining service. It differs from Binance by focusing more on options trading and providing specialized crypto services. The exchange has grown to be one of the largest globally, with a multi-currency wallet, margin trading, and API for algorithmic trading. OKCoin, the original platform, now focuses on fiat-to-crypto exchanges.