Advanced tier
What is internal and external liquidity?
External liquidity is the resting orders SMC traders expect beyond the two swings that bound the current range: where the last leg that broke structure began and where it ended. Internal liquidity rests at the smaller swings inside that range. The idea is that price alternates between the two: internal taken, external next; external swept, internal next.
How to spot it
Everything here depends on the range. In the ForexLens game it is set by the last leg that broke structure: the swing that leg began from and the swing it ended at. It is the same idea as the dealing range, framed by the leg that made it. Those two swings are the external levels. Stops from traders who are short tend to rest above the high, and stops from traders who are long tend to rest below the low. Those two pools are external liquidity.
Now look inside the range. Price rarely travels from one edge to the other in a straight line. It leaves smaller swing highs and lows on the way, and fast legs leave fair value gaps. The pools at those minor swings are internal liquidity, and many SMC traders count the gaps as internal levels too. The game grades the swing pools only. The same sorting applies to structure. The swings that define the range are external structure. The smaller swings inside a single leg are internal structure, and a break of one of those is a smaller event than a break of the range.
The teaching idea is a rhythm. After price takes an external pool, SMC traders expect it to rebalance inside the range, often into a gap. After it has done business at an internal level, they expect the next target to be an external pool. Read this as a way of organising targets, not as a law. The draw on liquidity page covers how a single target is chosen.
The rule ForexLens uses
The external swings are the two that bound the range of the last leg that broke structure, where it began and where it ended. Every confirmed swing between them that formed after that leg is internal. If an internal pool was taken last, the draw is read as the external pool on the other side. If an external swing was swept by a wick that closed back inside, the draw is read as the nearest untouched internal pool on the other side.
Step by step
- Find the last leg that broke structure with a body close. Mark the swing it began from and the swing it ended at: these are the external swings.
- Label the pools beyond those two swings as external: buy-side above the range high, sell-side below the range low.
- Label every confirmed swing that formed between them after that leg as internal, however sharp it looks. Swings from before the leg are old structure.
- Note which liquidity was taken last. A wick through an external swing that closes back inside is a sweep of external liquidity, and the range has not moved.
- Read the draw as the other kind, on the other side: internal taken, the external pool opposite; external swept, the nearest untouched internal pool opposite.
Worked example
The chart below is a seeded, simulated scenario from the Internal or External game, shown complete. Before opening the Lens, find the leg that broke structure and the two swings that bound it. On this chart they are the lowest swing low and the highest swing high.
Then look inside the range. The pullback after the leg left several smaller swings. Each one holds a small pool of stops, and each one is internal. Find the one that price traded through last.
With the Lens on, the two external levels are drawn as dashed lines, the internal swings are ringed, and the pool that was taken and the pool the rule points to are named. The walk-through under the chart gives the prices and the candle numbers.
In the game the chart stops at the question and the rest prints after your answer. Here you can see the outcome: price does reach the pool the rule points to, because the chart was built to show the idea. That is a property of the generator, not of markets.
GBP/USD, 15-minute candles, simulated
Reading the chart, step by step
- The leg that broke structure runs from the swing high at 1.27679 (candle 16) down to the swing low at 1.26785 (candle 25). Those two swings are external: they bound the range.
- 3 confirmed swings have formed between them since that leg: a high at 1.27086 (candle 30), a low at 1.26923 (candle 33), and a high at 1.27161 (candle 37). However sharp they look, they are internal.
- Candle 36 trades through the internal high at 1.27086. Internal liquidity was taken last, and both external pools still rest.
- The rule then reads the draw as the external pool on the other side: the external low at 1.26785.
- On this chart, which was built to show the idea, candle 44 reaches it. Real charts often do something else.
These numbers come from the generated chart above. Change the seed and the prices change; the rule does not.
Takeaway: Sorting pools into internal and external does not predict anything by itself; it tells you which list to look at next.
Common mistakes
- Sorting pools without a range. Internal and external only mean something relative to a dealing range. Mark the range first, every time, or the labels are arbitrary.
- Using an old range. Once price closes beyond the range high or low, that range is finished. The pools must be sorted again against the new one.
- Treating an internal break as a reversal. A break of a minor swing inside the range is internal structure. It is a smaller statement than a break of the range high or low and should be weighed that way.
- Mixing timeframes silently. An external high on a five minute chart is an internal level on the hourly. Say which timeframe the range belongs to before naming anything.
- Reading the rhythm as a rule. Internal to external is a tendency SMC traders describe, not a sequence the market must follow. Price can take two external pools in a row.
Does it work? An honest note
The sorting itself is sound bookkeeping. A range has edges and an inside, and it is useful to know whether the level you are looking at is one or the other. Stop orders do cluster at predictable levels. The published evidence is for round numbers, and obvious highs and lows are natural places for them too. That is a feature of how markets trade and not unique to smart money teaching.
The stronger claim, that price reliably alternates between internal and external liquidity, has not been demonstrated in any independent, published test that we know of. It is also easy to make true after the fact. With enough pools and gaps on a chart, almost any path can be narrated as internal to external. That flexibility is a weakness when you are trying to find out whether an idea has value.
ForexLens teaches the classification because it is mechanical and gradable, and because it makes the next question concrete: which pool, exactly, and why that one? It does not teach it as a source of profit. For the wider picture of where liquidity comes from in the real market, read how FX dealers and the 4pm fix work.
Questions people ask
What is the difference between internal and external liquidity?
External liquidity rests at or beyond the high and low of the current dealing range, where the stops of traders positioned inside the range are expected to sit. Internal liquidity is inside the range: the pools at minor swing highs and lows, and unfilled fair value gaps. The difference is purely location relative to the range. The same price level can change from external to internal when a larger range forms around it.
Is a fair value gap internal liquidity?
In SMC usage, yes, when it sits inside the dealing range. A fair value gap is not a pool of stops, but it is treated as an internal level that price may return to and rebalance. That is why the internal list on a chart usually holds two kinds of thing: minor swing pools and unmitigated gaps.
What does internal to external liquidity mean?
It is the idea that price moves in a rhythm: after reaching an internal level, such as a gap inside the range, the next draw is an external pool at the range high or low, and after taking an external pool, price returns inside. SMC traders use it to pick targets. It is a description of a tendency they expect, not a tested law, and price often breaks the pattern.
What is internal structure versus external structure?
External structure is made of the swings that define the dealing range, the major highs and lows. Internal structure is the smaller swings inside one leg of that range. A break of structure on the internal swings is read as a minor event, while a close beyond an external swing changes the range itself. Confusing the two is a common reason for calling reversals too early.
Which game teaches internal and external liquidity?
The Advanced tier game Internal or External asks you to tap the two external swings that bound the range, then the swing whose liquidity is the draw now. In the Core tier, the Liquidity Map and Draw on Liquidity games cover the groundwork.
Practise it
Reading about a rule is not the same as applying it. These games generate a fresh chart each round, ask you to find it first, and grade you against the same rule.
Internal or External
Separate the swings that bound the range from the swings inside it, then say which pool of liquidity is the real target.