The 20-Day Moving Average in Crypto: A Simple Trend Filter for Altcoins

Most trading indicators are more complicated than they need to be. The 20-period simple moving average, usually written SMA20, is the opposite: one line that answers one question. Is this coin trending up or down right now?

What it is

The SMA20 is the average of the last 20 closing prices. On a daily chart that is the last 20 days. On a weekly chart it is the last 20 weeks, and on a monthly chart the last 20 months. Each new period, the oldest price drops out and the newest goes in, so the line moves along with the chart.

Because it averages recent prices, it smooths out the noise. When price is above the line, the recent average is lower than today's price, which means the coin has been moving up. When price is below, the opposite.

The basic rule

• Price above a rising SMA20: the short-term trend is up.
• Price below a falling SMA20: the short-term trend is down.
• Price crossing back and forth over a flat line: no trend, a range.

That is the entire filter, and it is enough to keep you from a common mistake, which is buying coins that are in a downtrend just because they look cheap.

Three ways altcoin traders use it

1. As a filter for what to look at. Instead of scrolling through thousands of coins, start with the ones trading above their SMA20. That removes the coins that are falling and leaves the ones where the trend has at least turned.

2. For pullback entries. In an uptrend, price often dips back toward the SMA20 and bounces. Some traders wait for that dip rather than buying after a big green candle, which gives them a closer stop below the line and a better risk-reward.

3. As a warning. When a coin you hold closes below its SMA20 after a long run above it, that is an early sign the trend may be weakening. Some traders use it as a reason to reduce size, not necessarily to exit everything.

Combining timeframes

The same line on different charts tells you different things. A coin above its SMA20 on the daily chart is in a short-term uptrend. If it is also above the SMA20 on the weekly chart, the trend holds across a longer period, and that agreement tends to be more meaningful. A coin that is above on the daily but below on the monthly may just be bouncing inside a long downtrend.

How the scanner uses it

The scanner in the open the terminal, free does exactly this filtering for you. It lists coins trading above their SMA20 on the daily, weekly or monthly timeframe, limited to coins with at least $1 million of 24-hour volume, so the list contains coins you can actually trade rather than tokens with a handful of buyers.

Being on that list does not make a coin a buy. It means the trend has turned enough to be worth a closer look. The next steps are the ones that matter: check the chart structure, confirm the volume, find the catalyst and set your stop.

Where it fails

Every indicator has a weak spot, and for a moving average it is ranges. When price moves sideways, it crosses the line repeatedly, and each cross looks like a signal. Following those crosses in a range produces a string of small losses, known as whipsaws.

It is also a lagging indicator. Because it averages past prices, it confirms a move after it has started. You will always be a little late, which is the price of confirmation.

To reduce false signals, do not act on a single cross. Look for the line itself to be sloping in the direction of the trade, for price to have closed above it (not just wicked through), and for volume to support the move.

The takeaway

The SMA20 is a filter, not a strategy. It tells you which coins deserve your attention, and it does that very well. Deciding what to do with them still needs an entry, a stop and a target. See how to find altcoins before they move for the full process.