What Is Buy Side Liquidity in Trading? Pools Explained

Two people can say "liquidity" in the same room and mean unrelated things. A fund manager means how quickly a position can be sold without moving the price. A Smart Money Concepts trader means a spot: a price where a lot of orders are parked, waiting. This page is about the second meaning.

The naming is the first thing that trips people up, because buy side liquidity sits above price, which sounds backwards until you look at whose orders are up there. So the plan is: what the pools are made of, which levels hold them, and the one rule that tells you whether a pool was taken or a level was broken. Both of those look identical while the candle is still forming.

What is liquidity in trading?

Liquidity on a price chart is a location: the place where unfilled orders are stacked, waiting for someone to trade against them. Most of that stack is protective stops. Price travels toward those places because that is where enough size sits on the other side to fill a large position without dragging the price along the way.

That is a narrower definition than the one in a finance textbook, and deliberately so. The textbook version describes a market: a liquid market has tight spreads and you can get out at the price you see. The chart version describes a level, and it is the one that changes what you do next, because a level either has orders behind it or it does not.

Why do orders pile up in the same handful of places? Because everyone reads the same chart. Yesterday's high is visible to every trader on the instrument. So is the low of the Asian session, the round number, the second touch of the same high. Traders enter from those levels and put their stops just beyond them, which quietly turns each obvious level into a queue of resting orders at one price.

The methodology this site works from puts it bluntly: nothing else on the chart matters as much, and the structure points you already mark are the main liquidity of all. Read that way, a swing high stops being a shape and becomes a price where a crowd agreed to be wrong.

One honesty note before going further. Retail traders on forex and CFDs cannot see the order book, so nobody is reading actual resting orders off a screen. What you are doing is inferring: this level was obvious, therefore orders collected there. It is a reasonable inference and it is still an inference.

Where does buy side liquidity sit on a chart?

Above the current price. Buy side liquidity is the pool of buy orders resting above price: the stops of traders who are short, plus the breakout orders of traders waiting to buy strength. The mirror pool, made of sell orders, sits below price. Each side is named after the orders in it, never after the direction price has to travel to reach them.

Walk through one trader to see why. You sell at a level you like, and your protective stop goes above the recent high. That stop is a buy order. It has to be, because closing a short means buying. Now put four hundred traders in the same position with stops in the same neighbourhood, and the price above the high is where a wall of buy orders sits.

This is also why the two sides are rarely equal. One of them has usually been visited recently and the other has not. An untested pool is the one still holding orders, which makes it the obvious candidate for where price could go looking next. Some traders call that candidate the draw on liquidity. Whatever you call it, it is a statement about where orders are, not a forecast: plenty of untested pools sit there for months.

Marked properly, the picture is simple. Price is somewhere in the middle, with a pool overhead and a pool underneath, and the interesting question is which one is closer and which one is still untouched.

Which levels hold the biggest pools?

The obvious ones. A pool needs a crowd, and a crowd needs a level that every trader on the instrument can see without effort. That rules out anything you had to construct with three indicators and a diagonal line, and it puts the plainest levels on the chart at the top of the list.

The first row carries a name worth knowing. Swing points in the role of a pool are called external liquidity, meaning the orders sitting outside the current leg rather than inside it, and they are the levels the methodology treats as the most important on the chart.

Two other rows deserve a sentence each. The nearest pullback has its own name in Smart Money Concepts, and it behaves differently from everything else on the list, which is why it gets a page of its own. And a matching pair of highs or lows, the equal highs and lows that mark out a range, concentrates orders harder than a single high does, because the second touch tells everyone the level is real.

Zones belong on the list for a plain reason: people trade from them, so orders collect at their edges. That includes a fair value gap, which is not a pool itself but has traders sitting at both of its boundaries.

If you are marking a chart for the first time, start with the previous day's high and low and the session high and low. They are unambiguous, they cost nothing to draw, and they are the two levels the whole market shares.

How do you know a pool has been taken?

By where the candle closed, not by how far the wick reached. A wick through the level with the body closing back on the original side means the orders there were filled and the level held. A body closing beyond the level means the level itself broke. The same movement through the same price gives you two different readings, and the close is what separates them.

The rule has a defined scope, and it is worth knowing where it applies: structure levels, order blocks, order flow, session boundaries and the previous day's high and low. All of them ask for a body close. There is one exception on the whole list, and it is the nearest pullback level from the table above, which counts as taken on any touch at all.

Where traders go wrong is treating the wick case as a signal on its own. A pool being taken is a fact about the level, not permission to do anything. It tells you the orders that were sitting there are gone, which changes what the level can do next, and that is the whole of it. How traders then look for confirmation is a separate subject, and it is covered in the page on a liquidity sweep and its close relative, the liquidity grab.

The practical value of the rule is that it stops you from marking history wrongly. A level pierced by a wick is still a level. Cross it off the chart and you lose the reference you were using.

Whose orders are sitting in a pool?

Other traders' stops, mostly. A level becomes obvious, people enter from it, and each of them puts a protective stop just beyond it. Add the breakout orders waiting on the far side, and a single price ends up holding a cluster of resting orders that all point the same way. Your own stop, placed the same way, is part of that cluster.

Nothing about that is personal, and it helps to say so plainly. Nobody is hunting your position. What is happening is that somebody needs to fill a large order, and a cluster of stops is the only place on the chart where there is enough size to do it in one go. A pool is where a big participant can trade without moving the price fifty points against themselves.

The uncomfortable version of the same point: if your stop is somewhere obvious, that is because your entry was somewhere obvious. The two travel together. The answer is not to hide the stop at a random distance, which just breaks the link between the stop and the reason you would be wrong. The stop comes from the level and your invalidation; the size comes from where the stop belongs in a risk plan, calculated after the stop is placed rather than before.

If you want the diagnostic version of this, with what to do differently, that lives on the stop hunt page. Here it is enough to see what the pool is made of.

What should a level have before you mark it as a pool?

Four things, and all of them are checks you can run in a few seconds. The level has to be visible without an indicator, it has to have been respected at least once, it has to have existed before price arrived rather than after, and there has to be somewhere for price to go once the level gives way.

The first two checks throw out most candidates on their own. If you needed a tool to find the level, the crowd did not see it, and a crowd is the whole point. If price has never reacted there, nothing tells you anyone is defending it. The fourth check is about what happens afterwards: a pool with the next level ten pips away gives price nowhere to go once the orders are filled, so it rarely rewards the attention.

The third check does the most work. Drawing a level after price has already reacted from it feels like analysis and is actually memory. Everything looks like a pool in hindsight, which is why the levels worth keeping are the ones you can write down before the session starts, in the same spirit as trading a gap: the object has to be on the chart before price arrives, or you are not testing anything.

There is a tools answer to the tedious part of this. Marking yesterday's high and low, the session boundaries and matching pairs of highs or lows by hand on eight instruments is twenty minutes of clicking before you have looked at a single setup, and SMC ToolBox detects the PDHL and EQHL levels for you so the list is already on the chart. What it cannot do is decide which of them matters today.

Is liquidity the same thing as volume?

No, and the two get mixed up constantly. Volume is how much traded, and it is a number attached to each candle. Liquidity is where unfilled orders are waiting, and it is a level on the chart. Volatility is a third thing again: how fast price covers distance. A candle can print heavy volume nowhere near a pool.

Volume tells you what already happened. Liquidity is about what has not happened yet, which is why the two answer different questions. On forex the distinction is sharper still, because the volume your platform shows is tick volume from one broker's feed rather than the traded size of a centralised exchange.

Which leaves the last thing worth being straight about. Price reaching a pool does not have to reverse from it, and no amount of marking makes that outcome more likely. The candle close is the only part of the sequence that carries information, and it arrives after the wick everyone was watching.