Knowledge base
Where to start
If you are new here, read them in order: how the order book works → what a wall is → how to read the heatmap. Next — the difference between liquidity and liquidations.
Why read about the order book at all
Most charts show the past: the price at which trades have already happened. That is enough to describe a move, but not enough to understand why it stopped exactly here. The answer usually lies in the exchange order book — the queue of limit orders resting before any trade occurs.
Three things worth learning before anything else. First: price moves towards resting orders and stalls where there are many of them. Second: an order can be placed and pulled, so a “wall” is a declared intention, not a guarantee. Third: the spot book and the futures book work differently, and confusing them is the most expensive beginner's mistake.
How liquidity differs from liquidations. The words look alike; the meanings are opposite. Liquidity is orders someone placed voluntarily. Liquidations are positions the exchange closes by force. The first slows price down, the second speeds it up.
Why we write about limitations in such detail. Order book data is easy to sell as “insider information”: the picture looks convincing and is hard to verify. We go the other way — we say what is measured and what is modelled, and where our numbers end. A tool whose limits you understand is more useful than one that promises everything.
Each article below takes a few minutes and assumes no background. After them it makes sense to open the live BTC map — it will read as meaningful. How the data is collected is described on the methodology page.