Introduction

Moving Averages, RSI, and MACD are three of the most widely used indicators in crypto technical analysis. Together they help traders answer two core questions: is the market trending, and is momentum shifting? This lesson walks through how each indicator is calculated, how to read its signals, and how to combine them into a simple decision workflow.

Moving Averages — Smoothing Price Action

A Moving Average (MA) smooths raw price data so trend direction becomes easier to see. The two common types are:

Simple Moving Average (SMA) — average of the last N closing prices. Exponential Moving Average (EMA) — weighted average that reacts faster to recent price.

The basic formula:

def ema(prices, period):
    k = 2 / (period + 1)
    e = prices[0]
    for p in prices[1:]:
        e = p * k + e * (1 - k)
    return e

def sma(prices, period):
    return sum(prices[-period:]) / period

When a short-period MA crosses above a long-period MA it is called a golden cross (bullish). The opposite is a death cross (bearish). In crypto, a common pair is the 20 EMA over the 50 SMA for short-term swings, or 50 over 200 for longer-term trend confirmation.

RSI — Measuring Momentum Strength

The Relative Strength Index (RSI) is an oscillator bounded between 0 and 100 that measures the speed and magnitude of recent price changes. Values above 70 suggest overbought conditions, values below 30 suggest oversold.

def rsi(prices, period=14):
    gains, losses = [], []
    for i in range(1, len(prices)):
        diff = prices[i] - prices[i-1]
        gains.append(max(diff, 0))
        losses.append(max(-diff, 0))
    avg_gain = sum(gains[-period:]) / period
    avg_loss = sum(losses[-period:]) / period
    rs = avg_gain / avg_loss if avg_loss != 0 else 0
    return 100 - (100 / (1 + rs))

In strong crypto trends RSI can stay overbought or oversold for days, so treat the 70/30 thresholds as warnings rather than automatic signals. A more reliable read is looking for RSI divergence — when price makes a new high but RSI makes a lower high, momentum is weakening even though price keeps rising.

MACD — Trend and Momentum Combined

MACD (Moving Average Convergence Divergence) is built from two EMAs and a signal line, plus a histogram that shows the gap between them.

def macd(prices, fast=12, slow=26, signal_period=9):
    fast_ema = ema(prices, fast)
    slow_ema = ema(prices, slow)
    macd_line = fast_ema - slow_ema
    # In practice, signal line is EMA of MACD line values over signal_period bars
    signal = macd_line  # simplified single-point illustration
    histogram = macd_line - signal
    return macd_line, signal, histogram

Three core MACD signals: MACD line crosses above the signal line — bullish entry. MACD line crosses below the signal line — bearish exit. Histogram flips from negative to positive — momentum shifting bullish.

Combining the Three Indicators

No single indicator should be used alone. A practical rule is to require confluence — at least two of the three indicators agreeing before acting. For a long entry: price is above the 50 SMA, MACD histogram just turned positive, and RSI is rising from below 60 (not yet overbought). For a short or exit signal: the opposite — price breaks below the MA, MACD crosses down, and RSI drops from above 50.

Always pair these signals with risk management: position sizing, stop-loss placement, and a defined invalidation level. Indicators tell you when to look, but risk rules decide whether to act and how much to risk.

Summary

Moving Averages reveal trend direction through crossovers and price position relative to the line. RSI measures momentum strength and warns of exhaustion via overbought/oversold readings and divergence. MACD blends trend and momentum into a single oscillator with clear crossover signals. Used together with proper risk controls, these three indicators form a solid foundation for crypto trading decisions.

Common Mistakes

Relying on a single indicator in isolation, treating overbought RSI as an automatic sell signal in a strong uptrend, and ignoring timeframe — an RSI reading on a 5-minute chart says almost nothing about the daily trend. Always check what timeframe your signals are built on.