Декодований індикатор KDJ: що насправді потрібно знати трейдерам

KDJ is everywhere in crypto trading, but most people use it wrong. Here’s the real deal.

The Three Lines: Why They Matter Differently

KDJ has three curves—J is twitchy (fastest), K is middle-ground, D is smooth (slowest). Think of it this way: J catches the move first but gives false signals, D is reliable but late to the party, K sits in between. The whole thing measures the relationship between highest price, lowest price, and closing price, blending momentum + moving average logic.

Value ranges: K and D live in 0-100. J? It can go above 100 or below 0, which is actually where the signal lives.

The Golden Rules (Most People Ignore #2)

Rule 1: Oversold/Overbought Zones

• D > 80 = overbought (watch for pullback)
• D < 20 = oversold (setup for bounce)
• J > 100 = extreme overbought
• J < 0 = extreme oversold

Rule 2: Crossovers Matter, But Timing Kills

• K crosses above D = buy signal (but often fakes you out)
• K crosses below D = sell signal (same fake-out risk)

Where KDJ Actually Works

✅ Short-term trades: 4H, 1H, 15min charts—solid for catching momentum shifts

✅ Weekly analysis: Way more reliable for medium-term direction

❌ Long bull/bear trends: KDJ gets “lazy” and stops giving signals (degrades into noise)

❌ Choppy ranges: False signals galore

The J-Line Secret (Pros Use This)

J value signals hit rarely—maybe 2-3 times a month on weekly. But when they do, accuracy is stupidly high:

• J > 100 for 3+ consecutive days = watch for local top incoming
• J < 0 for 3+ consecutive days = likely bouncing up soon

Experienced traders literally hunt just for J signals and ignore the rest. It’s the “cheat code” of KDJ.

Parameter Tweak (Stop Using Default 9)

Default KDJ (period 9) = too noisy for daily charts. Try these instead:

• Period 5: aggressive
• Period 19: balanced
• Period 25: smoother

Adjust based on your timeframe and asset volatility.

The Catch

KDJ struggles when price enters one-sided trends—it flattens out and stops working. Classic trap: K enters overbought zone, you expect a dump, price just keeps ripping. This happens because KDJ measures oscillation, not trend strength.

Real talk: KDJ is great for range-bound markets and catching mean reversions. Use it with support/resistance levels or volume confirmation, not as a standalone signal.