crypto bots/Third party api

Questioning concerning the danger with crypto bots and so. I locate a page that may do crypto buying and selling for me.. They say that they may give a terrific return when utilizing their bot to do crypto handling. However what's the danger of this?

Have someone tried using binance and a few sort of bot/third celebration. Perhaps might help me to know the danger with giving out my api key. This website needs to have the public and private key. However what can they do with it. If I perceive right, they cant take my cash, simply to trades on my account?

So what's the danger of giving out the personal api key? How afraid do you have to be that they do one thing fishy, scam me or so? They api key only let them do trade, so I assume I can unfastened what I have on my account it trades. However no more or what?