The Ethereum mainnet has been targeted by four smart contract attacks within 48 hours, resulting in losses exceeding $1.5 million. According to GoPlus Security, the attacks included a breach of the Onchain aggregator contract, leading to a $983,000 loss, and a theft from a third-party vault contract linked to TradingProtocol, resulting in a $398,000 loss. Additionally, a reentrancy vulnerability in the BCB contract caused a $39,800 loss, while an arbitrary call vulnerability led to a $124,900 loss in QNT assets. GoPlus Security highlighted the increasing precision and speed of hacker attacks as AI technology advances, reducing vulnerability discovery times significantly.