Wu Blockchain has learned that the cross-chain execution protocol Relay team disclosed a vulnerability in its API interface, which leaked pending order information before transaction execution. This allowed MEV searchers to exploit the routing state for sandwich attacks. The attackers profited approximately $136,000 in total, affecting around 5,600 users, with a median loss of about $11.88 per user. Relay stated that it has paid a $50,000 bug bounty to the security team Outputlayer, who discovered the vulnerability, and plans to automatically issue full compensation to affected users. The total compensation amount is approximately $312,000, and users do not need to apply manually—the funds will be directly transferred to the corresponding wallet addresses. https://www.(wublock123.com)/news/relay-api-vulnerability-sandwich-attacks-full-compensation-5600-users-69168