How to read a crypto orderbook.

The book in thirty seconds

An orderbook is every resting limit order on a market, stacked by price. Bids (buyers) below the current price, asks (sellers) above it. The gap between the best bid and best ask is the spread — tight on liquid markets like BTC, wide on thin ones. When a market order arrives, it eats through the book; that’s what moves price.

Candles are the autopsy. The book is the patient, alive.

Depth: how much force a move needs

Raw levels are noisy, so terminals draw cumulative depth — total size available as you walk away from mid-price. Read it as resistance-to-movement:

• Thick side, thin side. If there’s 3x the size stacked below price than above, small sell flow gets absorbed while equivalent buy flow moves the market. Imbalance is directional information.
• Steps and cliffs. A smooth depth curve means distributed interest. A cliff — one huge level — means a single decision-maker, which leads to…

Walls — and why you shouldn’t trust them

A “wall” is an outsized order sitting in the book. The naive read: strong support/resistance. The problem: resting orders are free to cancel. Walls that vanish the moment price approaches were never meant to fill — they were placed to be seen. That’s spoofing, it’s illegal in regulated markets and endemic in crypto anyway.

The tell is behavior over time: a real level gets eaten into and holds; a fake one teleports away. Which is why the book alone is never enough —

The tape confirms the book

The trade tape is the list of executed trades — orders that actually happened and can’t be faked. Book and tape together answer the real question:

• Absorption: heavy selling on the tape, but the bid holds and depth refills — someone big is buying everything thrown at them. Bullish.
• Exhaustion: aggressive buying on the tape, but price stops advancing into thick asks — the push is out of fuel.
• Sweep: one print takes out several levels at once — urgency, usually information.

A 15-minute practice routine

1. Open a liquid market — BTC on Binance — with the book and tape beside the chart.
2. Watch the spread breathe for five minutes. Note how it widens on volatility.
3. Find the biggest visible level each side. Watch what happens when price approaches: eaten or vanished?
4. Every time a big print hits the tape, check what the book did the next second. That reflex — tape, then book — is the skill.

Orderbooks and tape are free on every market here, no account needed — the same view Cryptowatch veterans will recognize, rebuilt.