Liquidity

What it shows

Resting limit orders in the order book by price and time: green bids below price, violet asks above. Brighter means more size.

How to read it

The heatmap is the order book over time. Each column is a snapshot (four a second); each row a price. Bright bands that stay in place are large resting orders, often called walls. Watch whether price stops at them, eats through them or whether they disappear before price arrives (pulled).

How it's calculated

Depth records the full order book about four times a second and draws each snapshot as a column: one row per price, brighter for more resting size. Bids below price are green and asks above are violet. Because the columns line up over time, orders that stay in place become bands, and orders that are pulled disappear from one column to the next.

What it can't tell you

Resting orders can be canceled at any moment, so a wall is a fact about now, not a promise. The heatmap shows what was visible in the book; it cannot show hidden orders.