Originally launched in 2017 as OKEX, OKX now serves over 200 countries but keeps its gates closed to U.S. residents for its exchange services. Boasting over 350 cryptocurrencies and more than 500 trading pairs, OKX supports major tokens like BTC, ETH, OKB, and others. Its fee model is tiered, starting at 0.10% for trades, with reductions based on trading volume or OKB holdings.