Leverage & trading · 7 min read · Live · full book, 5% either side

How to read Bitcoin order walls

One-minute answer: An order book is the public list of buy and sell orders waiting to be filled at each price. An order wall is one unusually large pile of those waiting orders at one price. SafuTrading keeps a live copy of the whole Binance BTCUSDT perpetual order book and draws every wall it finds as a coloured band across the chart: green for waiting buy orders below the price, red for waiting sell orders above it.

What it actually means

An order book is simply a queue. Anyone who wants to buy Bitcoin but is not willing to pay today's price can leave an offer at a lower price and wait; anyone who wants to sell but wants more than today's price can leave an offer higher up and wait. Those waiting offers are called resting orders, or limit orders. Waiting buys sit below the current price and are called bids; waiting sells sit above it and are called asks. Nothing has happened yet — money changes hands only when somebody else agrees to trade against one of them, and the owner can cancel at any moment.

A wall is one pile of those waiting orders that is far bigger than the rest. Being large is not enough on its own, because the book around Bitcoin is already large: within 5% of the price there is routinely something like $170 million of waiting buys and $185 million of waiting sells, spread across hundreds of price steps. So a pile has to be unusual for its own side before we call it a wall. It must be worth at least $5 million, it must be worth at least 3% of everything waiting on that side within 5% of the price, and it must be at least five times the size of a typical price step in that book — all three at once. It also has to still be there three minutes in a row, so a pile that flashes up for a single minute never becomes a band. At most the six biggest per side are tracked in any one minute.

Green and red on this chart mean side, never mood. Green is always buy orders, red is always sell orders. Green is not "good" and red is not "bad" — a huge green pile of buy orders is not a promise of a rise, and a huge red pile is not a warning of a fall. If you remember one thing about the colours, remember that they tell you only who is waiting: buyers or sellers.

Every wall eventually ends, and the chart says how. A wall is closed when the pile shrinks to less than 30% of its biggest size and stays that small for two minutes running. If the price had traded into or through that band while the wall was alive, the wall was eaten — real money arrived, somebody traded against those orders, and the pile was consumed. If the price never got there, the wall was pulled — the owner simply cancelled it and walked away. The difference matters because only one of them cost anybody anything. An eaten wall is evidence that trades really happened at that price. A pulled wall is evidence of nothing except that somebody had orders sitting there and then did not.

That is why a wall is not a promise. It is a picture of what is waiting at this moment, and waiting orders can be cancelled in a second, without warning and without a fee. Large orders are sometimes placed precisely so that other people will see them and react, then taken away before the price arrives. Read a band as "this is where large orders are sitting right now", never as "the price will stop here".

What to look for

Green band — A buy wall: buyers' resting orders parked below the price. A level people watch, because the price has to eat through it to fall further.
Red band — A sell wall: sellers' resting orders parked above the price, sitting in the way of a rise.
Brighter band — More money in the wall. The names at the right edge — SELL WALL · $18.4M · $78,120 — spell out the exact dollars and the exact price for the biggest walls still standing.
A band that stops — The wall went away. Hover it to read which: eaten, meaning the price traded through it, or pulled, meaning the orders were cancelled before the price ever reached them.
Bars down the right-hand side — The order book as it is right now: how many dollars are waiting at each price step, from 5% below the price to 5% above it. Longer bar = more money waiting there. The dashed line through them is the current price.
The "Right now" line — In words, the closest sell wall above the price and the closest buy wall below it, with each one's size in dollars and how far away it sits as a percentage.
Layer chips above the chart — Walls is the chart itself and is on. Book heat and Large trades are two extra layers, off unless you switch them on: heat is a minute-by-minute picture of only the orders within about 0.1% of the price, and Large trades marks single trades of $500,000 or more.

Worked example

Suppose the sell orders waiting within 5% above the price add up to about $185 million. Three percent of that is $5.55 million, so on that side a pile has to beat $5.55 million to count at all — the $5 million floor is not the binding rule here. A pile worth $18.4 million appears at $78,120: it beats $5.55 million, it is far more than five times a typical price step, and it is still there in the third minute running, so a red band opens at $78,120 and the label at the right edge reads SELL WALL · $18.4M · $78,120. The "Right now" line says: closest sell wall $18.4M at $78,120, 0.9% above the price. Later that pile drops under $5.5 million — less than 30% of the $18.4 million it peaked at — and stays that small for two minutes, so the band stops. If the price had climbed into $78,120 at any point while the wall was alive, hovering the band says eaten. If the price never got that high, it says pulled.

What this cannot tell you

There is no history before our book keeper started. Exchanges publish the book as it is now and never as it was, so those minutes do not exist anywhere and cannot be bought; the chart hatches and labels the stretch before its first recorded minute instead of inventing it.
One market only: the Binance BTCUSDT perpetual futures book. That is a contract which tracks Bitcoin's price rather than Bitcoin itself, and it is one exchange out of many. Walls resting on other exchanges, or in the ordinary spot market, are invisible here.
Hidden and iceberg orders never appear. An iceberg shows the book only a small slice of itself at a time, so a genuinely huge order can leave almost no trace.
Only orders within 5% of the price are measured. A pile sitting further out than that is outside the window.
Sizes are what the book showed, not what will trade. An order can be cancelled the moment the price approaches it, and some are placed to be seen rather than filled.
"Pulled" and "eaten" describe what happened to a pile, never why it happened. Nobody outside the account that placed the order knows the reason.
The optional Book heat layer is a far narrower view than the bands: it covers only about 0.1% either side of the price, so almost every wall on this chart sits outside it.

Data source

SafuTrading's own book keeper: a live copy of the Binance BTCUSDT perpetual order book, started from one snapshot and kept in step with the exchange's stream of changes, recorded once a minute into our own wall and ladder tables. Candles are the same market's price. The two optional layers are our own minute-by-minute photos of the book within 0.1% of the price, and our own record of every Binance and Coinbase spot trade of $500,000 or more.

Open Order Walls & Large Trades — Green and red bands mark the big resting orders our keeper tracked, each drawn from the minute it appeared to the minute it went away, with the order book as it stands right now shown as bars down the right-hand side.