There is one Bitcoin indicator that has flagged the top of every cycle so far — and done it within three days of the actual high, every single time. It is called the Pi Cycle Top, and it works by watching two moving averages of Bitcoin's price converge. When the faster one crosses above the slower one, history says the market is at or near a euphoric peak. Across four cycle tops since 2013, the crossover has been uncannily precise. As of today the indicator is nowhere near firing: its ratio sits at roughly 0.39, meaning the two lines are far apart and the market is not stretched. This guide explains exactly what the two averages are, why the curious name involves the number pi, what the historical signals actually looked like, and the crucial caveat that four correct calls is far too small a sample to treat as a law.
What Is the Pi Cycle Top Indicator?
The Pi Cycle Top is a crossover indicator built from two simple moving averages of Bitcoin's daily price: the 111-day moving average and the 350-day moving average multiplied by two. In normal conditions the 111-day average — which tracks the price over the past few months — sits well below the doubled 350-day average. The indicator fires when the faster 111-day line rises far enough and fast enough to cross above the slower, doubled long-term line.
The logic behind that specific crossover is momentum exhaustion. For the 111-day average to climb above twice the 350-day average, Bitcoin's price has to have risen sharply and steeply over a sustained run — the signature of a parabolic, euphoric advance. Historically, by the time price has accelerated enough to force that crossover, the rally has burned through most of its remaining fuel, and a top is close.
It is important to be precise about what the indicator claims. It does not predict tops in advance, and it does not say how high price will go. It is a coincident-to-slightly-lagging flag that says: the kind of price acceleration that has historically accompanied cycle tops is happening right now. That is a narrower and more honest claim than "it predicts the top," and keeping the distinction clear is the difference between using the tool well and trusting it blindly.
How the Pi Cycle Top Is Calculated
The computation has three steps, repeated each day. First, take the average of Bitcoin's last 111 daily closing prices — that is the 111-day simple moving average. Second, take the average of the last 350 daily closes and multiply the result by two — that is the "350-day SMA × 2" line. Third, compare them. When the 111-day line crosses from below to above the doubled 350-day line, the indicator signals a cycle top.
To turn that crossover into a single readable number, the value tracked here is a ratio: the 111-day SMA divided by the 350-day SMA × 2. When the ratio is well below 1.0, the two lines are far apart and no signal is anywhere near. As a rally accelerates, the ratio climbs toward 1.0. The instant it reaches 1.0, the lines have crossed and the signal fires. Today the ratio is about 0.39 — the 111-day average is roughly 61% below the doubled 350-day average, a very wide gap.
Now the name. Why 111 and 350 specifically? Because 350 divided by 111 equals about 3.15 — strikingly close to pi (3.14159). That mathematical coincidence is the entire reason for the "Pi" in Pi Cycle. There is no deep theory forcing those exact window lengths; they were chosen because, when back-tested against Bitcoin's history, this particular pair happened to line up with cycle tops, and the ratio between them happened to approximate pi. That origin story matters, because an indicator selected by fitting past data is always at risk of having simply been lucky.
The averaging itself is plain and unweighted — every day in each window counts equally, with no exponential smoothing. The doubling of the 350-day average is what sets the crossover threshold high enough that it only triggers during genuinely extreme advances, rather than on every ordinary uptrend.
How to Read the Ratio
The cleanest way to read the Pi Cycle Top is through that single ratio of the 111-day SMA to the doubled 350-day SMA. It compresses the whole indicator into one number whose distance from 1.0 tells you how close the market is to a historical top condition.
| Ratio | State | What It Has Historically Meant |
|---|---|---|
| Below 0.5 | Far from a top | The two lines are widely separated. Price is not stretched relative to its long-term trend — typically early-to-mid cycle or a recovering market. Today's ~0.39 sits here. |
| 0.5 – 0.85 | Building | The faster average is climbing toward the slower line as a rally gains steam. Worth watching, but no signal — many rallies stall in this range without ever crossing. |
| 0.85 – 0.99 | Approaching | The lines are converging quickly. Historically the high-alert zone where a parabolic advance is in its late stage. Not a signal yet, but the margin is thin. |
| 1.0 or above | Signal fired | The 111-day line has crossed above the 350-day × 2. All four historical instances marked a cycle top within three days. Rare and, so far, decisive. |
The single most important reading habit is to treat the signal as binary but the approach as continuous. The signal itself is a clean yes/no — the lines have either crossed or they have not. But the ratio's journey toward 1.0 is the part you actually watch over time. A ratio drifting sideways at 0.4 says the market is calm; a ratio climbing from 0.6 to 0.9 over a couple of months says a parabolic move is maturing and the top zone is approaching fast.
A common misuse is reading a rising ratio as itself a sell signal. It is not — plenty of past advances pushed the ratio into the 0.7–0.9 range and then cooled off without ever crossing. The indicator's entire track record rests on the actual crossover at 1.0, not on the approach. Today's reading of ~0.39 means the market is in the lower band: the faster average is far below the threshold, and nothing about the current structure resembles a top condition.
Historical Signals: Every Crossover Since 2013
The Pi Cycle Top's reputation rests entirely on four data points. Since 2013, the crossover has fired exactly four times, and each one landed within three days of a cycle high. Here is the actual record — dates, prices, and the drawdowns that followed.
| Signal Date | BTC at Signal | What Followed |
|---|---|---|
| Apr 6, 2013 | $143 | First parabolic peak of the 2013 cycle. A roughly -65% drawdown followed over the next eight weeks. |
| Dec 3, 2013 | $1,155 | The late-2013 cycle top. A brutal multi-year bear market followed, with BTC down around -86% from the peak. |
| Dec 16, 2017 | $19,345 | Bitcoin peaked the very next day near $19,783, then fell roughly -84% through the 2018 bear market. |
| Apr 12, 2021 | $59,846 | Bitcoin peaked two days later near $64,895, then fell roughly -53% into the June 2021 low. |
Two features of this record stand out. The first is precision: in 2017 the signal preceded the exact daily high by one day, and in 2021 by two days. For a mechanical indicator with no knowledge of news, sentiment, or fundamentals to land that close to the top, four times running, is genuinely remarkable. The second is the severity of what followed — drawdowns ranging from roughly 53% to 86%. When this indicator has fired, the subsequent pain has been large.
But the honest reading of this table is also its biggest limitation, and it deserves to sit right next to the impressive part: four signals across thirteen years is an extraordinarily small sample. A coin flipped four times can land heads four times by chance. The indicator has never produced a false positive — but it has also never had the opportunity to, because it has only fired four times total. "Perfect record" and "tiny sample" are both true at once, and treating the first without the second is how confident traders get hurt.
Today the ratio sits at ~0.39 (no signal): the 111-day SMA (~$72,600) is far below the 350-day SMA × 2 (~$186,600). The lines would need to converge dramatically for a signal to fire. The market shows none of the parabolic acceleration that preceded the four historical tops — useful context, not a forecast, and built on only four prior samples.
How Traders Actually Use the Pi Cycle Top
The Pi Cycle Top is a profit-taking and risk-management lens, not a system that trades for you. It addresses one specific question — "is Bitcoin near a cycle top?" — and is most useful when combined with indicators covering the rest of the cycle. None of the following is financial advice; it is how the indicator is commonly read.
A late-cycle exit lens
The most common use is as a discipline tool near suspected tops. Because the crossover has historically preceded large drawdowns, some long-term holders treat an active signal as a cue to begin scaling out of risk rather than waiting for confirmation that the top is in. Used this way the indicator is one trigger among several for taking profit — not a command to sell everything on the day it fires.
Bracket the cycle with the 200-week MA
The Pi Cycle Top marks ceilings; the Bitcoin 200-week moving average marks floors. Read together they bracket the entire cycle — the Pi Cycle flags when price has accelerated into historically top-like territory, while the 200-week MA flags when price has fallen back to its long-term cost basis near historical bottoms. One tool for the euphoria, one for the despair, covering both extremes of the same range.
Confirm with sentiment
The historical Pi Cycle signals all fired into extreme greed — the euphoric, FOMO-driven final stage of a bull market. Cross-referencing an approaching or active signal with the Fear & Greed Index is a way to confirm the move is genuine late-cycle euphoria rather than an ordinary rally. A crossover arriving while sentiment is pinned at Extreme Greed is the textbook combination the indicator was built to catch.
What it cannot tell you
The indicator does not tell you how high price will go before it fires, exactly when to sell, how deep the following drawdown will be, or anything about individual altcoins — it is a Bitcoin-only metric. It flags a top condition; it does not size your position or time your exit. Treat it as one input for late-cycle risk decisions, never as a standalone trigger.
Limitations and Honest Caveats
- Four samples in thirteen years — the entire track record is four signals. A perfect record over such a tiny sample is statistically weak evidence that the fifth signal will behave like the first four
- Curve-fitted by origin — the 111 and 350 windows were chosen because they fit Bitcoin's past tops. Indicators selected by fitting historical data are always at risk of having simply been lucky
- Lagging-to-coincident — it fires at or just before the top, not weeks ahead. It is a discipline tool for recognizing a top condition, not a forecast that gives you time to prepare
- Bitcoin-only — it says nothing directly about altcoins, which typically top earlier and fall harder than BTC. It is a single-asset signal, not a market-wide one
- Post-2024 structural shift — spot ETF flows, institutional custody, and treasury accumulation have changed market structure. Whether cycle dynamics still produce the same parabolic tops the indicator relies on is genuinely untested
- Diminishing amplitude — each Bitcoin cycle has produced smaller percentage gains than the last. If future tops are less parabolic, the crossover may fire later, weaker, or not at all
Related Cycle and Sentiment Indicators
The Pi Cycle Top covers one extreme of the cycle — the ceiling. It reads richest alongside the indicators that cover the floor and the sentiment around both. The three below complete the picture.
- Bitcoin 200-Week MA — the opposite bookend. Where the Pi Cycle Top has marked cycle tops, the 200-week moving average has marked cycle bottoms. Together they bracket the full range, ceiling to floor
- Fear & Greed Index — the sentiment confirmation. Every Pi Cycle signal fired during Extreme Greed; pairing the two separates genuine late-cycle euphoria from an ordinary rally
- Altcoin Season Index — the rotation context. Cycle tops have historically aligned with the end of altcoin rallies, so a Pi Cycle signal alongside a high Altcoin Season reading is a combined late-cycle warning
Continue reading: Bitcoin 200-Week MA
The Pi Cycle Top marks the ceiling; the 200-week moving average marks the floor. Read the bottom-of-cycle indicator to complete the picture, top to bottom.
Continue reading: Fear & Greed Index
Every Pi Cycle Top signal fired in Extreme Greed. The Fear & Greed Index measures that euphoria directly — read how the sentiment gauge confirms a late-cycle top.
Track the Live Pi Cycle Top
See the current ratio, both moving-average lines, the live gap to a signal, and the full history chart back to 2013 with every crossover marked.
Frequently Asked Questions
How accurate is the Pi Cycle Top indicator?
On its track record, remarkably accurate: all four times it has fired since 2013, it landed within three days of a Bitcoin cycle high, with the subsequent drawdowns ranging from roughly 53% to 86%. But "accurate" needs a heavy asterisk — that record rests on only four signals across thirteen years. A perfect four-for-four is impressive and statistically thin at the same time. It has never produced a false signal, but it has also only had four chances to.
When did the Pi Cycle Top last signal?
The most recent signal fired on April 12, 2021, when Bitcoin was trading around $59,846. Price peaked two days later near $64,895, then fell roughly 53% into the June 2021 low. Before that, it fired on December 16, 2017 (BTC ~$19,345, one day before the peak), and twice in 2013. It has not signaled since April 2021 — as of today the ratio is about 0.39, far below the 1.0 trigger.
Why is it called "Pi" cycle?
Because of the two window lengths it uses: 350 and 111. Dividing 350 by 111 gives approximately 3.15, which is strikingly close to pi (3.14159). That numerical coincidence is the whole reason for the name — there is no deeper mathematical theory linking Bitcoin's cycles to pi. The windows were chosen because they fit historical tops well, and the ratio between them happened to land near pi.
Can the Pi Cycle Top fail?
Yes, absolutely. Its perfect record comes from a sample of just four signals, and the windows were curve-fitted to Bitcoin's past — both reasons for caution. On top of that, each cycle has produced smaller percentage gains than the last, so if future tops are less parabolic the crossover could fire late, fire weakly, or never fire at all. Post-2024 market structure changes (ETF flows, institutional ownership) add further uncertainty. Treat it as one input, not a guarantee.
Is the Pi Cycle Top signaling now?
No. As of the latest reading the ratio is about 0.39, meaning the 111-day SMA (~$72,600) sits roughly 61% below the 350-day SMA × 2 (~$186,600). The two lines are far apart and would need to converge dramatically for the signal to fire. The market currently shows none of the parabolic acceleration that preceded the four historical tops. The live tool updates this ratio every hour.
How is the Pi Cycle Top different from the 200-week MA?
They sit at opposite ends of the cycle. The Pi Cycle Top is a top indicator — it fires when a parabolic rally pushes the 111-day average above the doubled 350-day average, historically near cycle peaks. The 200-week moving average is a bottom indicator — price falling to that line has historically marked cycle lows. One flags euphoria, the other flags capitulation; traders often read them together to bracket the full cycle.