What Is the Pi Cycle Top Indicator?
The Pi Cycle Top indicator was developed by analyst Philip Swift and published in 2019. It is designed to identify the point at which Bitcoin reaches a cycle peak — the moment of maximum euphoria before a major correction begins.
The indicator uses two moving averages plotted against Bitcoin's price:
1. The 111-day moving average (111DMA) — a shorter-term trend line that responds relatively quickly to price changes.
2. Two times the 350-day moving average (2x 350DMA) — a longer-term, smoothed trend line that represents a higher threshold. The 350DMA is multiplied by 2 to create a level that sits above the normal price range.
The critical signal occurs when the 111DMA crosses above the 2x 350DMA. This crossover has historically coincided with Bitcoin reaching its cycle top — the highest price before a prolonged bear market begins. The name "Pi Cycle" derives from the near-Pi ratio between 350 and 111 (350/111 = 3.153).
How the Pi Cycle Top Works
The mechanics behind the Pi Cycle Top are rooted in the relationship between short-term and long-term momentum:
During a normal bull market, Bitcoin's price rises steadily, pulling the 111DMA upward. The 2x 350DMA also rises but much more slowly because it is based on a longer lookback period. As the bull market intensifies and price enters a parabolic phase, the 111DMA accelerates sharply.
The crossover point — where the 111DMA meets the 2x 350DMA — represents the moment when short-term momentum has stretched so far above long-term trend that the market is effectively overheated. The parabolic acceleration required to push the 111DMA above the 2x 350DMA is unsustainable, and price typically reverses shortly after.
On the Bitcoin Horizon Pi Cycle chart, both moving averages are plotted alongside Bitcoin's price. The distance between the two MAs serves as a visual gauge of how close the market is to a potential top signal. When the lines converge, caution is warranted. When they cross, historical precedent suggests the peak is in or imminent.
How to Read the Pi Cycle Top
The Pi Cycle Top is one of the simpler indicators to read:
Wide gap between MAs (111DMA well below 2x 350DMA): The market is in a normal or early bull phase. There is no top signal. This is the condition during bear markets and early recovery periods.
Narrowing gap: The bull market is maturing. As the 111DMA climbs toward the 2x 350DMA, the market is heating up. This narrowing can take months and serves as an early warning.
Crossover (111DMA crosses above 2x 350DMA): This is the signal. Historically, Bitcoin has been within days of its cycle peak when this crossover occurs. In three of four instances, the exact top occurred within 3 days of the crossover.
Post-crossover divergence: After the top, the 111DMA turns down as price falls, while the 2x 350DMA continues rising briefly before also turning. The widening gap after a crossover confirms the bear market.
It is important to note that the Pi Cycle Top is a top-only indicator. It does not signal bottoms or provide buy signals. It is designed for a single purpose: identifying when a bull market has likely peaked.
Historical Accuracy and Limitations
The Pi Cycle Top's track record is among the best of any Bitcoin cycle indicator:
April 2013: The crossover occurred on April 9, 2013. Bitcoin peaked at $266 on April 10 — a 1-day difference.
November 2013: The crossover occurred on November 28, 2013. Bitcoin peaked at $1,156 on November 29 — a 1-day difference.
December 2017: The crossover occurred on December 17, 2017. Bitcoin peaked at $19,783 on the same day — a 0-day difference.
April 2021: The crossover occurred on April 12, 2021. Bitcoin's first 2021 peak of $64,800 occurred on April 14 — a 2-day difference. (Note: Bitcoin went on to make a higher nominal peak in November 2021 at $68,789, but the Pi Cycle signaled the first peak.)
The limitations are significant despite this track record:
Small sample size: Four signals in 15 years is not statistically robust. The indicator could fail in future cycles.
The 2021 double peak problem: The 2021 cycle had two peaks ($64,800 in April and $68,789 in November). The Pi Cycle correctly flagged the first but not the second, higher peak. Whether the April or November peak was the "real" cycle top is debated.
No bottom signal: The indicator is silent during bear markets and provides no guidance on when to accumulate.
Potential for curve fitting: Critics argue that 111 and 350 were chosen specifically because they fit past data (data mining), and there is no fundamental reason why these specific periods should predict future tops.