when a big bank or financial institution buys a huge quantity of a currency, who sells it to them?
maybe another big bank or financial institution?
which one do you want to “follow”, the one buying or the one selling???
all transactions have a buyer and a seller, don’t they?
the nearest you’re going to get to an “indicator” that displays anything like what you want to see would be volume, and its relation to price movements
but the spot forex market doesn’t have volume information available, because there isn’t a centralized market for spot forex
don’t confuse any volume information you can see on your broker’s charts as the volume of the interbank market - it’s only their own volume, which has nothing to do with international currency markets
when you buy or sell a currency pair with your “broker”, you’re only betting against them about their own price movements of their own “product” - there aren’t really any actual currencies changing hands at all - you do appreciate that, right? (i ask only because your question above suggests that you might not?!)