Definition. The difference between resting buy liquidity (bid-side depth) and resting sell liquidity (ask-side depth) within a chosen price band around mid, measured in quote currency (e.g. USD/USDT).

Interpretation. Positive values mean more resting buy liquidity on the bid side. Negative values mean more resting sell liquidity on the ask side.

Technical. Time-weighted (biddepth - askdepth) in quote currency over the selected depth band around mid-price, across the resolution bucket.