The Pi Cycle Top Indicator, Explained
The Pi Cycle Top indicator has one of the most impressive resumes in all of crypto. It flagged the 2013, 2017, and 2021 Bitcoin tops within three days of the actual high. Then it missed one. That miss matters just as much as the wins, and most explainers leave it out. Here is the full picture.
What the Pi Cycle Top indicator actually does
The idea is simple. Take two moving averages of Bitcoin’s price, one short and one long, and watch for the moment the short one crosses above the long one. That cross has historically lined up with the exact days Bitcoin peaked.
The short line is the 111-day moving average. The long line is the 350-day moving average, doubled. When the short line rises fast enough to cross above the long line, it means price has been running so hot, so fast, that the market is likely overheated.
Why those specific numbers? 350 divided by 111 equals 3.153. That is remarkably close to pi (3.14159), which is where the indicator gets its name. Philip Swift, the analyst who published it in 2019, noticed the ratio and the pattern at the same time.
The track record people love to quote
Here is the highlight reel.
- 2013 top. The cross fired within three days of the peak.
- 2017 top. Same thing. Within three days of the all-time high near $20,000.
- April 2021 top. Bitcoin hit roughly $64,000, the cross fired, and price crashed over 50% in the following weeks.
Three tops. Three signals. All within a few days. That is why people call it one of the most accurate top indicators in Bitcoin’s history.
The miss that changed the story
After the April 2021 crash, Bitcoin recovered and ran to a new all-time high above $69,000 in November 2021. The Pi Cycle did not fire a second signal. It caught the first peak but missed the higher peak. That means anyone who sold on the April signal got a great exit, but anyone who expected the indicator to warn them again at the real top got nothing.
This is the honest version of the story. The Pi Cycle Top has never given a false positive (every time it fired, a major crash followed). But it has given a false negative (the November 2021 high happened without a signal). One miss in four cycles is still an incredible record, but “perfect” it is not.
Where the Pi Cycle Top stands right now
Bitcoin peaked near $126,000 in October 2025 and has since pulled back to around $79,000 as of September 2026. The two moving averages are far apart right now, which means there is no imminent cross and no top signal anywhere near firing. You can check this yourself on the live Pi Cycle Top chart.
That makes sense. We are well below the peak, deep into a cooling period. The Pi Cycle Top is a tool for warning you when things are too hot. Right now, they are not.
Why it might stop working
Every honest take on this indicator has to include the asterisk. The Pi Cycle Top has worked during Bitcoin’s first 15 years, the high-growth, high-volatility adoption phase. As Bitcoin matures, as ETFs bring in institutional money, and as the crashes get smaller each cycle, the conditions that made two moving averages cross at the perfect moment could change.
No indicator is a law of physics. The Pi Cycle Top is a pattern that has repeated in a small number of cycles. Four data points is not proof of a rule. It is a pattern worth watching, not a guarantee worth betting on.
How to actually use it
The worst way to use the Pi Cycle Top is to treat it like a sell button. The best way is to treat it like a smoke detector. When the two lines get close, you pay more attention. When they cross, you take the warning seriously and look for confirmation from other tools, like the MVRV ratio or simple price structure. No single indicator should control your decisions.
Think of it this way. If three different gauges all flash “overheated” at the same time, that is a much stronger signal than one gauge alone. The Pi Cycle is one gauge. A good one, with an impressive record, but just one.
The bottom line
The Pi Cycle Top indicator has the best public track record of any Bitcoin top-calling tool. It caught the 2013, 2017, and April 2021 peaks within days. It missed the November 2021 higher peak. It is not firing right now and will not fire until Bitcoin enters another overheated rally. Treat it as a warning light, not a crystal ball, and always pair it with context.
Common questions
What is the Pi Cycle Top indicator?
It is a Bitcoin chart tool that uses two moving averages (the 111-day and twice the 350-day) to flag market cycle tops. When the short average crosses above the long one, it has historically marked the peak within days.
Has the Pi Cycle Top indicator ever been wrong?
It has never given a false alarm (every cross led to a crash), but it missed the November 2021 top after catching the April 2021 top. So it has missed a peak, even though every signal it gave was accurate.
Is the Pi Cycle Top indicator firing right now?
No. As of September 2026, with Bitcoin well below its October 2025 high, the two moving averages are far apart and no cross is close to forming.
Why is it called the Pi Cycle?
Because 350 divided by 111 equals 3.153, which is very close to the mathematical constant pi (3.14159). The name comes from this ratio between the two moving average lengths.
Should you sell Bitcoin when the Pi Cycle Top fires?
Not blindly. The indicator works best as a warning light, not a sell button. When it fires, look for confirmation from other tools and price structure before making any decision.
Keep reading
- Bitcoin MVRV Ratio, Explained (What It Really Tells You)
- Why Does Bitcoin Crash? Every Crash, Exposed
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Education, not financial advice. Trading involves real risk.