READ Reading Data · February 2026 · ~4 min
The depth chart: seeing the walls on both sides
Price is only the result of trades; a depth chart shows the intent before them: it accumulates the order book into two staircases — bids on the left, asks on the right, current price in the middle. The taller and thicker the wall, the deeper the liquidity.
Three shapes
- Symmetric: bid and ask walls similar — a balanced market;
- Lopsided: one side clearly thicker — price is easily pushed toward the thin side;
- Step / cliff: a giant wall at one level, often a psychological round number or a whale's order — visible evidence of short-term support or resistance.
Its limits
Orders can be pulled or disguised (icebergs, spoofing). A depth chart shows the distribution of intent right now; it doesn't mean those orders will fill. Treat it as a live map of the liquidity terrain, not a promise.
Further: liquidity is thinnest — and riskiest — around releases; pair the depth read with a heatmap to pick active instruments first. For why depth suddenly thins, see reading the economic calendar.