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A volume bar accumulates the quantity of each aggTrade and closes when cumulative base-asset volume reaches the configured threshold. 
cumulative_quantity += quantity
close when cumulative_quantity >= threshold
The threshold is denominated in the product’s base asset. For BTCUSDT, a threshold of 100 means approximately 100 BTC of aggregated trade quantity per completed bar.

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Threshold overshoot

Meridian does not split the threshold-crossing aggTrade. Completed coin_volume can therefore be slightly greater than the configured threshold.

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Query example

{
  "exchange": "binance-futures",
  "product": "BTCUSDT",
  "bar_type": "volume",
  "begin": "2026-01-01T00:00:00Z",
  "end": "2026-01-02T00:00:00Z",
  "threshold": 100,
  "limit": 1000
}
Volume bars make activity comparable in base-asset terms. Dollar bars are usually more appropriate when the analysis needs comparable notional through large price changes.