OKX charges a 0.8% trading fee, so you might as well just use BOT. BOT is generally 1%, but the most cost-effective option is DBOT. With a membership, it's only 0.03%, and without a membership, it's 0.5%. If you trade frequently, getting a membership is totally worth it. BSC, ETH, and SOL are all supported, and the speed is pretty decent. XXYY and AXIOM are the fastest, but you need to handle it yourself. (xxyy.io)/?ref=eth200000 axiom.trade/@eth20000