# Order Book Heatmap Resting order-book liquidity over time, drawn behind the candles, to see where large limit orders sit and how price reacts to them. ## How to read it - Brighter cells mean more size resting at that price; thin colours mean little liquidity. - Bright horizontal bands are walls that can act as support or resistance. - Walls that vanish before price reaches them were pulled, not filled. ## Good to know - Colour scheme, sensitivity and opacity are set in the heatmap card (flame button). - Shows resting limit orders, not executed trades. A heavy indicator that uses more memory. [Learn more in the Academy →](#orderbook-heatmap)