Maker/ Taker fees

You may have already looked at this but, I'll mention it anyway.

Many exchanges charge a lower fee for "Maker" orders vs the "Taker" fee. (for example Bitfinex maker fee is 0.1% and Taker fee is 0.2%)

If your bot is executing 100s of trades per 24hr period, It may be worth providing an option were the bot will try to place a "Maker" order therefore incurring lower fees.