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How to get tick-by-tick volume from Zerodha’s WebSocket ?

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- Suresh Gupta
  
  April 24, 2026 at 8:34 pm
  📝 Question Details
  
  I’m using broker APIs like Zerodha and Angel One, and I noticed that they give cumulative volume instead of per-tick or per-candle volume.
  
  Because of this, I’m not able to calculate correct volume for my candles.
  
  How do we convert this cumulative volume into actual traded tick volume ?
  
  This topic was modified 37 days ago by Joshsarvaiya
- Algodelta Support
  
  April 24, 2026 at 10:59 pm
  You are right some brokers doesn’t give the direct per-tick volume we have to calculate that by comparing the tick cumulative volume with previous candle stored volume.
  
  So, like that we will have to convert volume manually.
  
  Below logic and code, you can refer.
  
  Delta Volume = Current Volume – Previous Volume
  Below code that you can refer:
  
  def calculate_delta_volume(ticks): prev_volume = None result = [] for tick in ticks: current_volume = tick["volume"] if prev_volume is None: delta = 0 # first tick else: delta = current_volume - prev_volume # safety check (in case of reset or bad data) if delta < 0: delta = 0 tick["delta_volume"] = delta result.append(tick) prev_volume = current_volume return result # usage ticks = [ {"price": 100, "volume": 1000}, {"price": 101, "volume": 1200}, {"price": 102, "volume": 1500}, ] output = calculate_delta_volume(ticks) for t in output: print(t)
  
  Later can use in the building candles from live data.
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