Hi @crypto.piotr,
thanx for stopping by.
The tool - both altcoin market index and fiat market index, are simply connected to the data extracted from most major crypto exchanges. Those events like deposits and withdrawals of specific cryptocurrencies and also movements in order books and executed orders play very big role in there. Simply as that and it´s crazy how precise it is. You can give it a try for free, where you will see 1 week delayed data - so you can do the backtest for yourself if it is a good tool for you or not.

I totally agree that its not easy to be well oriented in this evolving market, but on the opposit side, these tools, which can help you time the moment of entering or exiting the market might be very helpful. With those tools you can do just a few trades in a year and it might find you the peaks and the bottoms.