cycleanalysis

$BTC | Bitcoin sits at minus 0.87 sigma on SatoshiMacro's Rainbow Chart log regression as of October 2026, inside the "Still cheap" band, with the month's A$110,121 close running about 40 percent below the A$184,378 fair-value line the regression draws for that month. That sounds like a rare discount. The frequency data behind the chart says the opposite: bands this close to fair value cover most of Bitcoin's trading history, not a sliver of it.
## What does "Still cheap" actually mean on the Rainbow Chart?
The Rainbow Chart is a log-log regression fitted across 166 months of AUD-priced Bitcoin history going back to January 2013. The line itself has a slope of 5.41 and a residual sigma of 0.258, and nine colour bands sit above and below it at fixed sigma widths, from Fire Sale at the bottom through HODL (fair value, centred on the regression line) up to Maximum Bubble Territory at the top. "Still cheap" is the band directly beneath HODL, running from -1.2 sigma to -0.6 sigma. At -0.87 sigma, this month's close sits comfortably inside it.
On the desk we learned early that a model's labels are not the model. "Still cheap," "Accumulate," "Sell, Seriously, SELL!" read like trading signals. They are descriptive zone names stapled onto a statistical distance measure, and treating the label as an instruction is where most retail misuse of this chart starts.
## How often has Bitcoin actually traded here?
This is the part most people skip. Across those 166 months, the HODL band alone, which is the fair-value zone surrounding the regression line, has captured 41 percent of all monthly closes, 68 of 166. Widen that to the full plus-or-minus-1-sigma envelope, which includes both HODL and Still cheap, and you cover 66 percent of Bitcoin's entire monthly history. The plus-or-minus-2-sigma envelope covers 98 percent. Maximum Bubble Territory, by contrast, has only ever been visited in three months total, November 2013, December 2013 and January 2014, and the Fire Sale band at the bottom has never been visited at all.
Put plainly: a reading of -0.87 sigma is not a rare event flashing a buy signal. It is one of the two most commonly occupied zones in the chart's entire history. Calling it "cheap" is statistically defensible relative to the regression line. Calling it "rare" is not.
## Why doesn't this reading look like past cycle tops or bottoms?
The historical record on this same chart shows why framing matters. December 2017 peaked at +2.32 sigma, A$17,809 month-end, in the "Sell, Seriously, SELL!" band. March 2021 printed +1.97 sigma and April 2021 +1.84 sigma, in the same band. November 2021 came in lower again at +1.54 sigma, in "FOMO Intensifies," and the 2024-2025 cycle topped at only +0.75 sigma in January 2025, a band called "Is this a bubble?" Each cycle's peak has printed in a progressively lower band than the one before it.
The bottoms tell a messier story. September 2015 reached -1.72 sigma, in "Accumulate." December 2018 only reached -0.70 sigma, still inside "Still cheap," the same band sitting under today's reading. December 2022 printed -1.19 sigma. None of the three touched Fire Sale. My read is that the bottom side of this chart compresses faster than the top side does, which matches what every tightening cycle-top band has also shown: the extremes get harder to reach as the asset's market cap grows and the pool of marginal buyers needed to push it into a rare band gets larger.
## What's the honest limitation here?
The regression assumes log-log linearity holds, and a finite asset cannot sustain log-linear growth indefinitely. At some point this model breaks down, the same way every regression eventually does once the underlying growth regime changes. The sigma bands also assume roughly normal residuals, and Bitcoin's tails are fatter than that assumption allows for, which is exactly why occasional closes have printed outside the plus-or-minus-3-sigma envelope the normal distribution would predict. SatoshiMacro's own documentation on the page is blunt about this: sentiment labels are heuristics, not signals. I agree with my own disclosure here, which is the point of writing it down in the first place.
## So what would I actually do with a reading like this?
What I would actually do is treat -0.87 sigma as one input among several, not a standalone trigger, and size any add accordingly rather than treating "cheap" as permission to go all in. The lodgement deadline for self-lodgers lands today, 31 October, which is a reminder worth making explicit: anyone averaging into a position they plan to hold matters less for today's filing and more for the 12-month CGT discount clock the ATO starts running from the purchase date, not the lodgement date. Buying into a common band because a chart calls it cheap, without separately checking whether you are inside or outside that 12-month window on an existing parcel, is the mistake I actually see.
Still cheap is common. It has sat inside the plus-or-minus-1-sigma envelope for two out of every three months Bitcoin has traded. That is useful context for a long-horizon buyer. It is not a rare signal, and nobody should trade it like one.
https://satoshimacro.com/tools/crypto/cycle-indicators/bitcoin-rainbow-chart/?utm_source=binance_square&utm_medium=social&utm_campaign=autopilot_article
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