Volume is probably the second most important concept in technical analysis, right after support and resistance. Yet it's the one beginners ignore the most. The reason: volume isn't "sexy". It has no flashy colors, doesn't draw patterns. It's just there, in bars under the chart. And yet, it's what validates — or invalidates — everything you can read about price.
What is volume?
Volume measures how many units of the asset were traded during a given period. On a 1h candle, volume represents the total quantity bought + sold during that hour. It's displayed as bars below the main chart, with a color matching the candle's direction (green if bullish, red if bearish).
Volume is essential because it answers a simple question: how many people actually validated this price move?
A coin that's up 5% on very low volume says: "a few buyers aligned to push, but nobody else follows". The move is fragile.
A coin that's up 5% on massive volume says: "many traders validated this direction, the move is sustained". The move is solid.
This difference, invisible on the price chart alone, becomes obvious when you look at volume.
The three gold rules of volume
Rule #1: volume confirms the trend
A price move is considered healthy when accompanied by volume. In a healthy uptrend:
- Green candles have higher volume than red ones;
- Pullbacks (small retracements) occur on lower volume (fewer convinced sellers);
- Upswings regain volume.
In a healthy downtrend, it's the opposite: large red candles with high volume, small bounces on low volume.
If you see a trend weakening in volume (directional candles posting less and less volume), it's a sign of exhaustion. The trend might continue, but it's losing reliability.
Rule #2: volume validates breakouts
This is the most actionable rule. When price breaks a support or resistance, check the volume:
- Breakout with large volume (significantly above recent average) → the break is probably real, the move has good odds of continuing.
- Breakout with normal or low volume → be careful. There's good odds of a false breakout that reverses within a few candles.
This rule alone can prevent an enormous proportion of bad trades. Never take a breakout without checking volume.
Rule #3: volume spikes signal extremes
When you see a candle with much higher volume than average (3x, 5x, 10x), it's a signal to interpret by context:
- In an already-long move: often a sign of capitulation (everyone capitulates at once) or climax buying (panic buying). Typically a potential reversal point.
- At move start: it's an initiation — big players taking position with force. Often the sign of a trend starting.
- On a breakout: strong confirmation, see rule #2.
Context determines everything. Large volume at the end of a parabolic rise is nothing like large volume at the start of consolidation.
Volume/price divergences
A volume divergence appears when price does something volume doesn't validate. Two classic configurations:
Bearish volume divergence: price makes a new high, but the volume on this move is lower than on the previous high. Translation: "price is going up, but fewer and fewer buyers follow". It's a warning — the trend is losing fuel and might reverse.
Bullish volume divergence: price makes a new low, but volume on this move is less than before. "Price is dropping, but fewer and fewer sellers follow". Downward pressure is running out.
These divergences aren't entry signals in themselves. They're alerts: when you see one, start looking for a more concrete signal in following candles (reversal, trendline break, oscillator divergence too).
Volume pitfalls in crypto
Pitfall #1: exchanges lie. Some exchanges artificially inflate volumes with wash trading. On small exchanges or small coins, displayed volumes can be fake. Prefer volumes from big exchanges (Binance, Coinbase, Kraken) over aggregated volumes from doubtful sources.
Pitfall #2: volumes aren't comparable between coins. $10M/day volume is huge for a small cap and tiny for BTC. Volume must always be analyzed relative to the coin's history, not in absolute value.
Pitfall #3: weekends and off-hours. In crypto, volume structurally drops weekends and nights (European time). "Low" volume at 4am on a Sunday doesn't mean the same as low volume at 3pm Tuesday.
Pitfall #4: airdrops and special events. A coin can have massive volume one day because of an airdrop or listing — that's not a trend, just a one-time event. Check the news before concluding.
Volume-derived indicators
Beyond raw volume, a few indicators can enrich your reading:
- OBV (On-Balance Volume): cumulatively tracks volume by candle direction. When it diverges from price, it's often predictive.
- Volume Profile: shows at which price levels volume concentrated. High-activity zones often become strong support/resistance. See Support and resistance.
- VWAP (Volume Weighted Average Price): the volume-weighted average price over a period. Often serves as intraday dynamic support/resistance.
You don't need all of them. Master raw volume first — that's already 80% of what you can extract from it.
How to practice reading volume
Simple exercise: on a chart, find the largest volume spikes of the last 30 days. For each, ask yourself:
- What was happening to price at that moment? (Breakout, reversal, continuation?)
- What happened next? (Did the move continue, reverse?)
- Could I have anticipated it by looking at candles + volume together?
This exercise, done on 3-5 coins, teaches you to integrate volume into your reading automatically. After a few weeks, you won't look at a breakout without checking volume first — and your false-signal rate will plummet.
To go further
- Support and resistance: the levels where volume becomes powerful;
- Divergences: oscillator divergences, cousins of volume divergences;
- Trendscanner: filter your pairs by volume to only watch liquid, exploitable markets.