According to Cas Abbé, the ETH/BTC trading pair has recently retested its multi-cycle support level, a critical signal for altcoin holders. Historically, when ETH/BTC rises, altcoin markets experience significant gains, making this pair a key indicator for altcoin portfolio performance. Conversely, declines in ETH/BTC often result in sharp losses for altcoin investors. Cas Abbé also notes that with the Federal Reserve expected to shift towards a risk-on environment in 2025, traders should closely monitor ETH/BTC for early signs of altcoin market momentum, as this could dictate trading strategies and portfolio reallocation (Source: Cas Abbé on Twitter, May 6, 2025).