i have checked many bots a while ago, but i could not yet find a bot that meets my needs.
there are currently two sets of bots found. (just google bitcoin or altcoin trading bot and you will find many)
the open sourced bots, which are good because they are open source so there is no doubt of their true purpose. but at the same time they are not as good and don't have enough features to use.
the closed source not free bots, which are bad because you can't tell what they will do with your API keys and also you have to buy them, but they are better because they have more features.
but none of them are good enough, the only bot which can be good is the one you code or hire a developer and ask him to code it to your needs.
What would you think of a bot that is not open source but only charges you if it is profitable?
Would you pay for it or not?
i know there is one bot (not sure about the name) which you have to have a certain amount of an altcoin (same name as the bot) to be able to trade (so it is free but charges you somehow) but it is not open source.