Stochastic Oscillator

Developed by George Lane in the 1950s, the Stochastic Oscillator measures where the current close sits within the high-low range of the last N periods (default 14). %K = (close - lowest low) / (highest high - lowest low) × 100. %D is a 3-period SMA of %K (the signal line). Values above 80 are overbought; below 20 are oversold. The key insight is that in an uptrend, prices tend to close near the high of the range; in a downtrend, near the low. When this pattern breaks down, momentum is shifting.

• Overbought/oversold reversals in ranging markets: %K crossing below 80 from above is a sell signal; crossing above 20 from below is a buy signal.
• %K/%D crossovers: when %K crosses above %D in the oversold zone (below 20), it is a bullish signal; crossing below %D in overbought (above 80) is bearish.
• Divergence: price making a new high while Stochastic makes a lower high is a bearish divergence warning.
• Trend confirmation: in a strong uptrend, Stochastic can stay above 80 for extended periods — use this as a trend-continuation signal rather than a reversal.
• Multi-timeframe: a daily Stochastic in oversold territory combined with a 4H bullish %K/%D cross is a higher-probability long setup.

• Stochastic is extremely sensitive to the lookback period. The default 14 periods generates many false signals in volatile crypto markets — try 21 or 28 for smoother readings.
• Like RSI, Stochastic can remain in overbought territory for the entire duration of a strong trend. Shorting every time it hits 80 in a bull market is a losing strategy.
• The %D line is a lagging smoothing of %K — by the time a %K/%D cross occurs, the move may already be well underway.
• Stochastic is calculated on high-low-close data. In crypto, where wicks are often extreme, the high-low range can be dominated by a single spike candle, distorting the reading.
• Fast Stochastic (raw %K and %D) vs Slow Stochastic (smoothed) behave very differently. Most platforms default to Slow — confirm which version you are using.