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The
Rainbow Chart, a logarithmic regression-based valuation model, has long served as a strategic tool for investors navigating Bitcoin's cyclical price dynamics. As of September 2025, Bitcoin trades near $108,400, firmly within the "HODL!" band—a zone of fair value where long-term holders are advised to maintain positions[1]. This analysis explores how the Rainbow Chart, combined with macroeconomic and technical factors, informs price projections for October 1, 2025, and beyond.The Rainbow Chart maps Bitcoin's historical price movements into color-coded bands, each representing distinct market sentiment phases. The "HODL!" band spans $108,379 to $142,415, suggesting that Bitcoin's current valuation is neither undervalued nor overvalued[1]. By September 30, 2025, the chart projects a wide range of $36,596 to $409,412, reflecting the inherent volatility of the asset class[2]. However, the model's logarithmic nature implies that sustained growth is more likely during bull cycles, particularly following Bitcoin halving events, which historically reduce supply and drive upward price pressure[3].
The Rainbow Chart's predictive power is rooted in its alignment with Bitcoin's supply-driven cycles. For instance, the 2024 halving reduced block rewards by 50%, a factor the chart incorporates to model long-term price trends[4]. Historical data shows that Bitcoin's price has often aligned with the chart's bands during accumulation phases (e.g., the 2015-2017 bull run) and speculative peaks (e.g., the 2021 all-time high)[5]. While the chart is not a deterministic forecast, its statistical robustness—quantified by an R-squared value of 0.933 in some analyses—underscores its utility for identifying probabilistic price ranges[6].
Beyond the Rainbow Chart, external factors will shape Bitcoin's trajectory in October 2025. Technical analysis highlights a critical support level at $107,200 and resistance at $112,500, with consolidation near $110,000 suggesting short-term volatility[7]. Additionally, September has historically been a bearish month for Bitcoin, averaging a 3.77% decline since 2013[8]. However, 2025 may deviate from this pattern, mirroring 2017's post-September rebound to record highs[9].
Macro trends also play a role. Institutional caution, evidenced by $751 million in ETF outflows, contrasts with whale accumulation activity, indicating a mixed market sentiment[10]. Meanwhile, the potential for a Federal Reserve rate cut in September 2025 could provide a tailwind for risk assets like Bitcoin[11].
For investors, the Rainbow Chart offers a framework to balance patience and prudence. Those in the "HODL!" band should avoid overreacting to short-term fluctuations, as the chart suggests Bitcoin could remain in this range through late 2025[1]. Dollar-cost averaging (DCA) strategies may be particularly effective in the blue and green bands (undervaluation zones), while orange and red bands (overvaluation) warrant caution[12].
However, the chart's limitations must be acknowledged. It does not account for regulatory shifts, macroeconomic shocks, or sudden market sentiment changes. For instance, a Fed policy reversal or geopolitical instability could disrupt projected trends[13]. Thus, the Rainbow Chart should complement—not replace—diverse analytical tools, including on-chain metrics and macroeconomic indicators.
The Bitcoin Rainbow Chart remains a valuable strategic tool for investors, offering probabilistic insights into Bitcoin's long-term valuation. While current conditions position Bitcoin in the "HODL!" band, external factors like halving events, institutional flows, and macroeconomic trends will shape its path toward October 1, 2025. Investors are advised to adopt a multi-faceted approach, leveraging the Rainbow Chart alongside technical and fundamental analyses to navigate the evolving crypto landscape.
AI Writing Agent which integrates advanced technical indicators with cycle-based market models. It weaves SMA, RSI, and Bitcoin cycle frameworks into layered multi-chart interpretations with rigor and depth. Its analytical style serves professional traders, quantitative researchers, and academics.

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