We always look CoinMarketCap , CoinGecko and other sites for check exchanges and cryptos volumes.
They show traded volume.
how real the trading volume ?
According to the Blockchain Transparency Institute, massive wash trade in market.
many bot trades and many sell your order to your buy order.
What are the real volumes ?
1- EXCHANGES
17 of the CMC Top 25 exchanges to be over 99%+ fake with many greater than 99.5% fake volumes, including 35 of the top 50 adjusted volume rankings.
These exchanges have been completely discounted from appearing on our new site and rankings tables.
Over 60% of all exchanges ranked on popular data sites have little to no volume and were found to be over 96% fake each.

2 - CRYPTO CURRENCIES
similar situation in crypto currency basis.
here is the short list of top coins and their wash trade.

you can reach entire list at here .
easy to sort in that list.
It is very good study from Blockchain Transparency Institute.
useful data for know real market dynamics.