According to jesse.base.eth (@jessepollak), 'Onchain summer is coming,' signaling increased activity and opportunities in the Ethereum (ETH) and DeFi ecosystems (source: Twitter, June 19, 2025). Historically, 'Onchain summer' refers to a seasonal surge in blockchain-based applications, on-chain trading volumes, and DeFi participation, especially on the Ethereum network. Traders should monitor ETH price action, DeFi token volumes, and NFT market trends during this period, as past onchain summers have led to significant short-term volatility and elevated trading opportunities across decentralized exchanges and protocols.