The order book shows every resting buy and sell order with sizes. Learning to read its depth turns the market from a single price into a landscape of supply and demand.
Why this topic matters
Depth tells you what happens when someone your size enters. A dense book absorbs large orders with little movement; a sparse book lets a single order move the price several percent. Depth also thins quickly away from the best prices — the wall two percent down may be gone in seconds.
How to do it well
Look at the first five to ten levels on each side, not just the top of book. Compare density before and after news. Watch for fake walls: large orders that appear and vanish without trading are manipulation signals, not support.
Practical checklist
- Look at five to ten levels, not just the best price
- Compare density before and after major news
- Treat vanishing walls as manipulation signals
- Prefer liquid pairs while learning
Common mistakes
Beginners trade the quoted price and ignore everything else. The professional habit is boring: check depth, check spread, size accordingly — and remember the book is a snapshot of intentions, none of which are binding.
What it looks like in practice
Practical picture: a pair shows a best ask of 1.50 for 200 coins, then asks of 1.55 for 50. A 250-coin market buy pays 1.50 for the first 200 and 1.55 for the rest — an average of about 1.51. The screen price was true only for the first slice; depth is what turned it into your real cost.
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FAQ
Why do walls disappear?
Placing orders costs nothing; large visible orders are sometimes cancelled before trades reach them. Treat them skeptically.
Does deep liquidity guarantee fills?
It describes current intentions. Fast markets can consume visible depth in milliseconds.
Educational content only — not financial, legal or tax advice. Facts verified October 2026.