Bitcoin DeFi platform ALEX Lab was hit by an $8.3M exploit involving STX, sBTC, USDC/USDT, and WBTC.ALEX Lab Foundation has pledged full reimbursement in USDC to affected users based on on-chain exchange rates.Claim process involves submitting a form by June 10, with verified users receiving reimbursement within 7 business days.The incident highlights ongoing security concerns in Bitcoin DeFi protocols despite commitment to repayment.