If you are looking for bot then I would suggest never to go with the bots that are available for some BTC. If the bot was that good he/she would never make it public. Also, the one who has created the bot can create a bot to set bets against your bets and use your funds for his profit. I am saying this out of experience. 18 months ago when I was setting up bots. I got in touch with a guy(dont want to disclose his name) he should the results of this and everything was good for about 1 month and the bot was on a net profit. Then his bot took a trade which as against my analysis that was the bet which liquidated one of my account because of the bot.
Do not use those bots which do not have stoploss. Also it is always better to trade on the bots that are tried and tested by you.I had my bots before as well as I keep improving my bots but, I do not trust on others bot and would never suggest anyone to use others bot. I have set scalping and other bots on Bitmex and Arbitrage bot on Changelly and
Coinswitch.
I agree with this, if a bot is really profitable then its creator will have no need to sell it for any price because the only thing that you need is a little bit of capital and you will get more money with your trading bot than whatever you could get for selling it, this is why if you want to use a bot to generate profits you need to at first learn how to trade and be profitable yourself and then you can code your own bot that trades like you with the obvious advantage that the bot will never get tired and can always watch the markets and then take the right decision every time.