What is OBV? Volume-Based Price Analysis
On-Balance Volume (OBV) is a technical indicator that uses volume flow to predict changes in stock price. Developed by Joseph Granville in 1963, OBV is based on the idea that 'volume precedes price' and that institutional money flow can be detected through cumulative volume.
How is OBV Calculated?
OBV is a cumulative total of volume. It follows three simple rules:
- If today's close is higher than yesterday's, the day's volume is added to OBV.
- If today's close is lower than yesterday's, the day's volume is subtracted from OBV.
- If prices are equal, OBV remains unchanged.
How to Read OBV Signals
Trend Confirmation
When OBV and price are both making higher highs, it confirms the sustainability of the uptrend. It shows that buyers are aggressive and the move is backed by high volume.
Divergence (The Secret Signal)
Divergence is OBV's strongest signal. If price is rising but OBV is falling, it suggests 'smart money' is exiting the asset and a price drop is likely. Conversely, if price is flat or falling but OBV is rising, accumulation is happening and a breakout may be imminent.
Breakouts
An OBV breakout often happens before a price breakout. If OBV breaks through its resistance line, traders watch for the price to follow shortly after.
OBV is a cumulative indicator. Its absolute value doesn't matter; what matters is the slope and direction of the line relative to price.
OBV and Institutional Flow
Large institutional investors often try to buy quietly. OBV reveals these silent accumulations by tracking every single trade's volume, making it an essential tool for detecting 'whale' activity in crypto markets.
Optimizing OBV with Optimo
OBV can sometimes give 'false' spikes during unusual volume events. Optimo backtests OBV against historical data to see if it accurately predicted past reversals for your target asset, helping you decide when to trust its signals and when to wait for more confirmation.
