There are two types of bots: trading and arbitration. Trading bots work on the same exchange and receive income as a result of buying currency at a low price, and selling at a higher price. Arbitration bots are in fact little different from trading bots, but they work on several exchanges at once, comparing the coin rate on each of them every second.
A bot is a service that runs on a ready algorithm, accelerates and simplifies the process of earning money on the crypt. I will explain with the example of Bibitbot, which sends notifications to Telegram. You choose a pair of any coins. Bot monitors all existing exchanges and informs you about the results. The message indicates the percentage difference between the courses. Your task is to make transactions: buy, and then sell. There are bots that do this automatically. But I would not trust my wallet program.
So. A notification comes, and then you decide for yourself. Over a day of such notifications comes more than a hundred. Imagine how many profitable trades. The subscription price of bots is not the cheapest, but it pays off in due course.
Of course, you can monitor the exchanges yourself and catch short "holes", but do not forget that there are 150 exchanges. You do not have time for everything. Hence the need for a bot. The cost of subscription depends on the number of exchanges and exchanges with which the bot will work. Bibitbot has a free trial for one day and a weekly subscription. Deposits are not needed. So you can try it yourself and understand the algorithm of bot actions on its example ( http://www.bibitbot.com/) I will add that arbitration itself does not require prediction. First of all, speed is important here.
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