According to Wei (@thedaoofwei), the phrase 'ETH summer' highlights renewed bullish sentiment in Ethereum as trading volumes and price action accelerate in late May 2025. On-chain data confirms a significant uptick in ETH transactions and DeFi activity, with analysts attributing the surge to increased institutional inflows and Layer 2 adoption (source: @thedaoofwei tweet, Glassnode data, DeFiLlama). Traders are closely monitoring resistance levels near $4,000, as a breakout could set the stage for further gains in the broader crypto market. The current trend supports Ethereum's leadership in the altcoin sector, with spillover effects on related DeFi tokens and NFT platforms.