Since I use volume profile indicator for trading I wonder how do I know which exchanges are known to provide true volume data and have considerable history.
I think there is no tool to know whether a volume of an exchange is totally real or fake. But I guess most exchanges have a hybrid mixture of fake and real volumes. Some have larger fake volumes than the real ones while a handful have larger real ones than fake ones. If you want, choose the exchanges that are popularly accepted by the majority such as Binance. The volume there is mostly real.
binance was a big exchange so the high volume that we saw on this exchange are more likely to be legit while other unpopular exchange that shows some massive amount of volume could be fake .
there are also tools that we can use to see the volumes of an exchange and most of those tools were already proposed above . some examples would be cmc and coingecko . cmc is the ones that people use the most for this matter while coingecko works fine also