RSI (Relative Strength Index): Spotting Overbought and Oversold

The Relative Strength Index (RSI) is one of the most popular momentum indicators in trading. It measures how fast and how much price has been moving, on a scale of 0 to 100. RSI helps you identify when an asset might be overbought (too expensive) or oversold (too cheap) — key moments for potential reversals.

How RSI Works

RSI compares the magnitude of recent gains to recent losses over a set period (default: 14 periods). The formula produces a number between 0 and 100:

• RSI above 70: Overbought — price has risen too fast. A pullback or reversal may be coming.
• RSI below 30: Oversold — price has fallen too fast. A bounce or reversal may be coming.
• RSI between 30-70: Neutral — no extreme signal.

How to Trade with RSI

Basic Strategy

• Buy when RSI drops below 30 and then crosses back above 30 (oversold bounce)
• Sell when RSI rises above 70 and then crosses back below 70 (overbought rejection)

RSI Divergence (Advanced)

Divergence is when price and RSI move in opposite directions — one of the most powerful signals in technical analysis:

• Bullish divergence: Price makes a lower low, but RSI makes a higher low. Suggests selling momentum is weakening. Potential reversal upward.
• Bearish divergence: Price makes a higher high, but RSI makes a lower high. Suggests buying momentum is weakening. Potential reversal downward.

RSI in Crypto vs Traditional Markets

Crypto is more volatile than stocks, so RSI levels need adjustment:

• In strong bull trends, RSI can stay above 70 for weeks. Consider 80 as overbought instead.
• In strong bear trends, RSI can stay below 30 for weeks. Consider 20 as oversold instead.
• The best RSI signals occur when combined with support/resistance levels

Settings

• 14-period RSI: Default. Good for swing trading on daily charts.
• 7-period RSI: More sensitive. Better for short-term trading. More signals but more false signals.
• 21-period RSI: Smoother. Fewer signals but more reliable.

Common Mistakes

• Trading RSI alone without considering trend direction — RSI overbought in an uptrend is NOT a sell signal; it confirms strength
• Using RSI on very short timeframes (1-minute) — too much noise, too many false signals
• Expecting immediate reversal at 70/30 — RSI can stay extreme for extended periods in trending markets

Add RSI to your Mal.io chart analysis on TradingView and practice identifying divergences on historical data before trading live.