According to the source, $1.6T has been added to the total crypto market cap since April, source: public X post dated Sep 21, 2025. For trading alignment, monitor BTC dominance (BTC.D) and the total market cap ex-BTC (TOTAL2) to gauge whether inflows rotate into altcoins or remain BTC-led, source: TradingView indices BTC.D and TOTAL2.

According to @MilkRoadDaily, TOTAL2—the market cap of all crypto excluding BTC—has returned to its 2021 highs, marking a pivotal resistance for altcoin season breadth, source: @MilkRoadDaily. A decisive break and sustained hold above this area would signal a broad altcoin breakout rather than a majors-only rally, source: @MilkRoadDaily. Conversely, failure to reclaim and hold would likely keep the bull market narrow and concentrated in large-cap leaders, source: @MilkRoadDaily.

According to @MilkRoadDaily, the total crypto market cap excluding BTC has broken a 4-year resistance as altcoins print large green candles, source: @MilkRoadDaily on X, Sep 15, 2025. According to @MilkRoadDaily, this measure has risen from 200B in 2021 to 1.6T, roughly a 700 percent increase, source: @MilkRoadDaily. According to @MilkRoadDaily, resistance breaks often precede strong follow-through, signaling potential momentum across non-BTC assets, source: @MilkRoadDaily.

According to @AltcoinGordon, Bitcoin dominance is falling while the altcoin market cap is printing new highs, signaling that an altseason could be starting. Source: @AltcoinGordon on X Traders typically confirm this setup by checking BTC.D trending lower alongside weekly breakouts in TOTAL2 or TOTAL3, which are standard market-cap indices used by market participants. Source: TradingView market cap indices and Binance Academy overview of Bitcoin dominance Rotation approaches often begin with high-liquidity large-cap alts and then expand to mid-caps if BTC price remains stable; when BTC volatility spikes, altcoins often underperform. Source: Binance Academy discussion of altcoin risk and Investopedia on volatility and risk management Key confirmation levels include a decisive breakdown of the prior swing low on BTC.D and a sustained weekly close to new highs on TOTAL3 to validate breadth before scaling exposure. Source: TradingView Risk controls such as position sizing and stop-loss placement are essential during cross-asset rotations. Source: Investopedia on position sizing and risk management

According to @rovercrc, he stated on X on Sep 12, 2025 that "Phase 2 is here" and "the real Altseason starts soon," signaling a bullish rotation narrative for altcoins, source: Crypto Rover on X Sep 12, 2025. Traders typically validate an altseason by observing sustained declines in Bitcoin dominance and outperformance of the total crypto market cap excluding BTC (TOTAL2), source: Binance Academy Altseason guide and Binance Academy Bitcoin Dominance explainer. Market participants also monitor breadth such as the share of altcoins trading above the 50-day moving average to confirm trend strength, source: Investopedia Moving Average. Leverage gauges including perpetual swap funding rates and open interest can foreshadow volatility during alt rallies and are widely tracked by derivatives traders, source: Binance Academy Funding Rate and Investopedia Open Interest.

According to @rovercrc, altseason has started based on his X post on Sep 12, 2025 stating "IT'S ALTSEASON NOW" without supporting metrics, source: X post by @rovercrc dated 2025-09-12. Traders typically seek confirmation via a declining Bitcoin dominance BTC.D and an upside breakout in the Altcoin Market Cap TOTAL2 alongside expanding market breadth and volume, source: Binance Academy on Bitcoin Dominance and TradingView educational resources on TOTAL2 and market breadth. Until those confirmations are evidenced, treat the claim as unverified and keep altcoin exposure sized conservatively with predefined stops and risk limits, source: Binance Academy Risk Management.

According to @rovercrc, a breakdown in Bitcoin dominance ($BTC.D) is looming, which they claim would trigger a rotation of capital into altcoins. Source: https://twitter.com/rovercrc/status/1965808233831895141 BTC.D tracks Bitcoin’s share of total crypto market capitalization, making it a widely used gauge for potential altseason dynamics when it trends lower. Source: https://www.tradingview.com/symbols/CRYPTOCAP-BTC.D/ Traders commonly confirm rotation by monitoring BTC.D losing key support while CRYPTOCAP:TOTAL2 trends higher and major alt/BTC pairs (e.g., ETHBTC) break up. Source: https://www.tradingview.com/symbols/CRYPTOCAP-TOTAL2/ and https://www.tradingview.com/symbols/BINANCE-ETHBTC/ Educational resources outline how changes in Bitcoin dominance can relate to phases where altcoins outperform, guiding the use of BTC.D alongside market-cap indexes. Source: https://academy.binance.com/en/articles/what-is-bitcoin-dominance

According to @AltcoinGordon, altcoins have entered an uptrend for the first time in three years, indicating a potential rotation toward higher-beta crypto assets, source: X post dated 2025-09-07. For traders, this claim suggests watching for relative strength in altcoin pairs versus BTC and USDT to validate momentum, source: @AltcoinGordon. Before increasing exposure, confirm with BTC dominance trending lower, ETH/BTC making higher highs, and TOTAL2 holding a rising daily structure on TradingView, source: TradingView charts.

According to @rovercrc, the altcoin market cap is forming a cup-and-handle pattern that could break out toward above $3 trillion, as shown in his chart shared on X on Aug 24, 2025 (source: Crypto Rover @rovercrc, X/Twitter, 2025-08-24). Traders can watch for a decisive breakout above the handle’s resistance and sustained momentum through the $3 trillion psychological level as confirmation, aligning with cup-and-handle guidelines detailed by William J. O'Neil (source: William J. O'Neil, How to Make Money in Stocks, cup-with-handle breakout criteria). Volume expansion on the breakout and a strong weekly close historically improve reliability for this setup (source: Thomas Bulkowski, ThePatternSite.com, Cup with Handle pattern statistics). A failure back below the handle low often invalidates the pattern and can be used as a risk marker for position sizing (source: Thomas Bulkowski, ThePatternSite.com, Cup with Handle failure conditions).

According to @rovercrc, Bitcoin dominance ($BTC.D) is set to crash similar to 2021, which he states would be bullish for altcoins as shown in his shared chart and comment. source: @rovercrc on X, Aug 16, 2025. In 2021, BTC dominance declined from roughly 70% in early January to around 40% by May while altcoins gained market share, illustrating the inverse relationship between BTC.D and altcoin performance. source: CoinMarketCap Bitcoin Dominance historical chart. For trading, a decisive weekly breakdown in BTC.D alongside strength in ETH/BTC and SOL/BTC is commonly used to confirm rotation into altcoins, with traders prioritizing high-liquidity large caps first to manage slippage and risk. source: Binance Academy article on Bitcoin Dominance and altcoins; TradingView cross-pair metrics. Breadth confirmation can be monitored via TOTAL2 or TOTAL3 breakouts and rising altcoin market cap ex-BTC, while applying risk controls to guard against market-wide drawdowns if BTC weakens. source: TradingView crypto market cap indices (TOTAL2, TOTAL3); Binance Academy risk management guidance.

According to Cas Abbé, the altcoin market capitalization index has broken out of a four-year consolidation range after multiple failed attempts during 2024 rallies (source: Cas Abbé on X, Aug 14, 2025). According to Cas Abbé, this move suggests alts are now catching a bid, with momentum he indicates could persist, contrasting with prior non-confirmed rallies in 2024 (source: Cas Abbé on X, Aug 14, 2025). According to Cas Abbé, the breakout marks a structural shift he describes as this time is different, making the reclaimed level a key pivot for market participants tracking follow-through (source: Cas Abbé on X, Aug 14, 2025). According to Cas Abbé, no specific tickers or levels were disclosed in the post, and the focus is on the aggregate altcoin market cap chart he shared (source: Cas Abbé on X, Aug 14, 2025).

According to Trader Tardigrade, the 3-day chart of the altcoin market cap index TOTAL2 is showing conditions that could precede an altseason, as highlighted in his X post with a chart on Aug 9, 2025 (source: Trader Tardigrade on X, Aug 9, 2025). TOTAL2 tracks the total crypto market capitalization excluding Bitcoin, making it a direct gauge of altcoin breadth and trend strength for traders (source: TradingView symbol description for CRYPTOCAP TOTAL2). His call implies a potential bullish rotation into altcoins, with traders commonly seeking breakout confirmation on TOTAL2 before increasing risk exposure to altcoin positions (source: Trader Tardigrade on X, Aug 9, 2025; source: Edwards and Magee, Technical Analysis of Stock Trends, breakout confirmation guidance).

According to @cas_abbe, the total altcoin market cap (TOTAL2) has broken out of a 3-month consolidation range, confirming that a rotation of liquidity into altcoins is underway. This technical breakout is driving simultaneous key level breaches across multiple cryptocurrencies, signaling increased trading opportunities for altcoin traders. Source: @cas_abbe.

According to @rektcapital, the Total2 index, which excludes Bitcoin and tracks the aggregate market capitalization of altcoins, is currently consolidating above a critical resistance level. This technical pattern mirrors similar consolidations seen in 2016 and 2020, which preceded significant altcoin market rallies known as Altseasons. Traders should monitor this price action closely, as confirmed consolidation above resistance could indicate a continuation of bullish momentum and heightened trading opportunities in the altcoin sector. Source: @rektcapital on Twitter.

According to Trader Tardigrade (@TATrader_Alan), the $TOTAL2 index, which tracks the total market capitalization of altcoins excluding Bitcoin, has reversed its previous downtrend and is now exhibiting a clear uptrend with higher highs and higher lows. This structural shift indicates renewed bullish momentum for altcoins, suggesting the onset of a new altseason. Traders are advised to monitor $TOTAL2 for confirmation of continued strength, as this trend could lead to significant capital inflows into major altcoins and trending DeFi tokens. Source: Trader Tardigrade on Twitter, May 8, 2025.

According to Trader Tardigrade, the $Total2 index is showing a bullish hidden divergence on the RSI 3-day chart, with a higher low on the Total2 index and a lower low on the RSI. This pattern suggests potential upward movement in altcoins, indicating we may be approaching an altseason. Trader Tardigrade highlights multiple signals pointing towards this market condition shift.