Is there a way that I can know if some whale has just place a large order in any exchange in the world without a need to check all them every time, is there any indicator?
We don't have any tools for that to find out big orders but what you can do is go to the exchanges where the volume of which coins you want to check is maximum and the look them periodically for any big orders.
If we have something like that means everyone can can save themselves when the whale selling their coins.