user91686: I want to find the trading volume to do some trend analysis.But I can't find 

user91579: I am assuming you are asking for trading volume across exchanges.
Brave New Coin (BLX) provides a good API to get volume weighed average across major exchanges: https://bravenewcoin.com/data-and-charts/indices/blx
You can also see their chart with volume on Trading View (look for BLX ticker): https://www.tradingview.com/chart/?symbol=BNC:BLX

91686: <p>I want to find the trading volume to do some trend analysis.But I can't find </p>
 91579: <p>I am assuming you are asking for trading volume across exchanges.</p>

<p>Brave New Coin (BLX) provides a good API to get volume weighed average across major exchanges: <a href="https://bravenewcoin.com/data-and-charts/indices/blx" rel="nofollow noreferrer">https://bravenewcoin.com/data-and-charts/indices/blx</a></p>

<p>You can also see their chart with volume on Trading View (look for BLX ticker): <a href="https://www.tradingview.com/chart/?symbol=BNC:BLX" rel="nofollow noreferrer">https://www.tradingview.com/chart/?symbol=BNC:BLX</a></p>
