Currently, with the introduction of DEX, many people decide to conduct transactions directly from crypto wallets such as MetaMask, MEW through the swap feature. However the transaction costs are quite high, around 0.3% + gas of the blockchain, so I don't think it's a good choice for full-time professional traders. It should only be considered as an option to increase the liquidity of tokens in wallets, but if for transactions, users should use CEXs such as Binance, KuCoin, Yobit, Houbi...