Most crypto traders watch price and ignore volume. This is a mistake. Price tells you what happened. Volume tells you who made it happen and how committed they are. A 5 percent rally on triple average volume is fundamentally different from a 5 percent rally on half average volume. The first suggests genuine buying pressure. The second suggests a low-liquidity drift that can reverse instantly.
We use three volume indicators in our strategies: OBV (On-Balance Volume), CMF (Chaikin Money Flow), and MFI (Money Flow Index). Each captures a different aspect of volume behavior, and together they provide a comprehensive picture of whether money is flowing into or out of an asset.
On-Balance Volume (OBV)
OBV is the simplest and most intuitive volume indicator. It tracks cumulative volume by adding the full bar's volume when the close is higher than the previous close and subtracting it when the close is lower. The result is a running total that rises when buying volume dominates and falls when selling volume dominates.
The absolute value of OBV is meaningless. What matters is the trend. Rising OBV means accumulation: more volume is flowing in on up-days than out on down-days. Falling OBV means distribution: selling volume exceeds buying volume.
In our volume momentum strategy, we compare OBV to its 20-period simple moving average. When OBV is above the SMA, the volume trend is bullish. Below the SMA, bearish. This is one of four scoring components in the strategy's signal generation.
OBV's strength is simplicity and responsiveness. It captures the direction of volume flow without any complex calculation. Its weakness is that it treats all volume equally: a bar that closes up by 0.01 percent gets the same volume credit as one that closes up by 5 percent. The next two indicators address this limitation.
Chaikin Money Flow (CMF)
CMF measures whether money is flowing into or out of an asset by weighting volume by the close's position within the bar's range. The formula calculates a money flow multiplier as (2 times close minus high minus low) divided by (high minus low), then multiplies by the bar's volume, sums over 20 periods, and divides by total volume over the same period.
The result ranges from negative 1 to positive 1. A CMF above 0.05 indicates meaningful buying pressure. Below negative 0.05 indicates selling pressure. Between negative 0.05 and positive 0.05 is neutral.
CMF is more nuanced than OBV because it considers where within the bar the close occurred. A bar that closes near its high (strong buying pressure) contributes positively. A bar that closes near its low (strong selling pressure) contributes negatively. A bar that closes at the midpoint contributes nearly zero regardless of volume.
In our strategy, CMF above 0.05 adds a bullish point to the scoring system. Below negative 0.05 adds a bearish point. The threshold of 0.05 filters out noise from balanced bars and only counts periods of clear directional volume pressure.
Money Flow Index (MFI)
MFI is essentially volume-weighted RSI. It calculates a typical price (average of high, low, and close), multiplies by volume to create money flow, then separates into positive and negative money flow based on whether the typical price is rising or falling. The ratio of positive to negative flow over 14 periods, scaled to 0-100 like RSI, produces the MFI reading.
MFI below 20 is oversold (heavy selling volume). Above 80 is overbought (heavy buying volume). Because MFI incorporates volume, it can diverge from RSI. If price is rising (RSI bullish) but MFI is falling (volume not confirming), the divergence suggests the rally lacks conviction.
In our strategy, MFI below 80 is required for long entries (avoiding buying into volume exhaustion) and MFI above 20 is required for short entries (avoiding selling into capitulation). These are filter conditions rather than signals: they prevent entries in extreme volume conditions that often precede reversals.
The Four-Point Scoring System
Our volume momentum strategy combines all three indicators with a volume spike detector into a four-point scoring system.
Point one: OBV above its 20-period SMA (volume trend is bullish). Point two: CMF above 0.05 (money flow is positive). Point three: MFI is not in the extreme zone that contradicts the trade direction (below 80 for longs, above 20 for shorts). Point four: current volume exceeds 1.5 times the 20-period volume average (volume spike confirming increased interest).
Full confidence (0.85) requires all four points plus 4-hour timeframe confirmation. Three of four points without higher timeframe confirmation produces 0.45 confidence. Fewer than three points generates no signal.
The layered approach means the strategy only generates high-confidence signals when multiple volume indicators agree that money flow supports the intended direction. A single indicator can be noisy. Three indicators pointing the same direction is a much stronger signal.
Volume in Mean Reversion vs Momentum
Volume indicators serve different purposes in different strategy types. In our momentum strategy, volume confirmation is valuable because genuine trends are accompanied by increasing volume. A breakout on low volume is more likely to fail than a breakout on high volume.
In mean reversion, volume plays a subtler role. Our VWAP reversion strategy uses OBV to confirm that the deviation from VWAP has volume support for a reversion. If price drops below VWAP and OBV is above its average (buying volume still present despite the price drop), the deviation is more likely to revert. If both price and OBV are declining, the move may be a genuine trend rather than a temporary deviation.
The Bollinger Band mean reversion strategy does not use volume indicators directly. We tested adding volume confirmation and it did not improve validated Sharpe ratios. The Bollinger Band signal is already robust without volume, and adding it increased complexity without measurable benefit.
Practical Recommendations
Start with OBV. It is the simplest volume indicator and provides the clearest signal: is cumulative volume flowing in or out? Compare it to a moving average rather than watching the absolute level.
Add CMF when you need to understand the quality of volume, not just the direction. CMF tells you whether closes are happening near highs (strong buying) or near lows (strong selling), which OBV cannot distinguish.
Use MFI as a filter rather than a signal generator. Extreme MFI readings (below 20 or above 80) identify conditions where further entries in the extreme direction are risky. MFI below 20 means selling volume is exhausted, which is a bad time to initiate shorts.
Do not use all three as standalone trading signals. Volume indicators confirm moves. They do not predict them. Our most successful use of volume indicators is as components in a multi-indicator scoring system where volume agreement increases confidence in signals generated by price-based indicators.