Altcoins show strength as Solana draws capital — is 2023 all over again?

Altcoin rallies often follow a recognizable pattern: capital flows into Bitcoin during risk-on periods, while altcoins tend to remain capped unless Bitcoin faces resistance. That dynamic is currently under scrutiny as Bitcoin dominance (BTC.D) fails to break above 60%, prompting speculation that another correction may be forming.

BTC dominance at a key level and historical reversals

Historically, BTC.D has shown sharp reversals when it reaches its resistance line, also referred to as the Altcoin Accumulation Line. In 2018, BTC.D reached 72%+ and was followed by a crash. In 2021, it climbed to 73%+ and triggered another crash. In 2025, BTC.D has reached 64%+ and, at the time of writing, appeared to be forming a potential breakdown structure.

Source: TradingView (BTC.D)

Why 2021’s altcoin rally looked different

The 2021 altcoin rally—described as the most bullish on record, when the Altcoin Season Index broke above 100—aligned with Ethereum’s breakout against Bitcoin. Technically, the ETH/BTC pair surged by more than 212% during that period, positioning ETH/BTC as the key trigger for the altseason.

Current cycle: weaker ETH support

In contrast to 2021, there is limited evidence of capital flowing into Ethereum. While ETH staking has reached a record 31.6% of total supply, ongoing ETF outflows are described as capping the effect of that supply squeeze. As a result, the ETH/BTC ratio is down nearly 10% so far this year, putting pressure on the typical ETH-led altcoin rally.

Solana as a potential catalyst

Solana’s role in sparking altcoin rallies remains a focal point. In 2023, the SOL/BTC ratio finished the year up nearly 300%, while ETH/BTC fell by around 30%. That move coincided with the Altcoin Season Index breaking out, contributing to a full-blown altseason by early Q1 2024.

Institutional flows into SOL: data points

The article highlights differences between the 2023 cycle and the current one. In 2023, SOL/BTC broke out in tandem with the Altcoin Season Index. This time, SOL/BTC is already down nearly 16%, described as making it almost twice as weak as ETH/BTC—suggesting the cycle could develop differently.

It also points to Solana’s ETF activity. According to Lookonchain data, Solana’s ETF inflows have been relatively stronger than both Bitcoin and Ethereum. Over the past 7 days, Solana’s net flows were -$12 million, which is characterized as less negative than its peers. Over the past 1 day, Solana’s net flow rose to +$1.26 million, the strongest among the three.

Fundamentals: revenue and the SOL/ETH relationship

The piece also links on-chain fundamentals to market positioning. It argues that stronger network revenue reflects higher usage, since more transactions typically translate into higher fees and greater on-chain activity. Over the past 24 hours, Solana reportedly pulled in 2x the revenue of Ethereum.

Against that backdrop, the SOL/ETH ratio holding around 0.04 is presented as a potentially meaningful signal. However, the article emphasizes that a full-blown altcoin rally would still require a breakout in SOL/BTC.

Impact and what to watch next

While it is described as too early to determine whether the current market is repeating 2023, the conditions being tracked are: SOL/BTC gaining traction while BTC.D continues to weaken. If that combination develops, it could indicate early stages of a SOL-led altcoin rally, making SOL/BTC a key trend to monitor in the coming weeks.

Final summary

• ETH/BTC is down this year, limiting a typical altseason, while SOL has seen relatively stronger flows lately.
• A SOL/BTC breakout alongside weakening BTC.D could signal early stages of a SOL-led altcoin rally.