Bitcoin DeFi platform Alex Protocol has been hit by an $8.3 million exploit, significantly impacting the Stacks (STX) token price. The breach, attributed to a vulnerability in the platform's self-listing verification logic, resulted in substantial digital asset losses. Alex Lab Foundation has pledged full reimbursement to affected users.
Key Takeaways
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Alex Protocol suffered an $8.3 million exploit due to a vulnerability in its self-listing verification logic.
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The breach led to the loss of STX, sBTC, USDC/USDT, and WBTC.
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Alex Lab Foundation has pledged full reimbursement in USDC to all affected users.
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The incident significantly impacted the price of Stacks (STX) tokens.
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This is the second major exploit for Alex Protocol in a short period, raising concerns about security in Bitcoin DeFi.
Alex Protocol Suffers Major Exploit
On June 6, 2025, Alex Protocol, a prominent Bitcoin decentralized finance (DeFi) platform operating on the Stacks blockchain, experienced a significant security breach. The exploit led to the loss of approximately $8.3 million in various digital assets. The vulnerability was identified in the protocol's self-listing verification logic, which allowed an attacker to drain liquidity from several asset pools.
The attacker siphoned off a substantial amount of digital assets, including:
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8.4 million Stacks (STX) tokens, valued at approximately $5.69 million
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21.85 Stacks Bitcoin (sBTC), worth around $2.24 million
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149,850 in USDC and USDT
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2.8 Wrapped Bitcoin (WBTC), valued at approximately $287,000
This incident marks one of the largest exploits within the Stacks ecosystem to date and is the second major security incident for Alex Protocol in a short period, following a $4.3 million cross-chain bridge attack in May 2024.
Commitment to Full Reimbursement
In response to the exploit, the Alex Lab Foundation, the organization supporting the protocol, has committed to fully reimbursing all affected users. The reimbursement will be made in USDC tokens, utilizing the foundation's treasury reserves. The total repayment value is stated to be $8,373,227.13.
Reimbursement calculations will be based on the average on-chain exchange rates recorded between 10:00 AM UTC and 2:00 PM UTC on June 6, 2025, the day of the attack.
Alex Lab has outlined a clear process for affected users to claim their funds:
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By June 8, 23:59 UTC: Affected wallets will receive an on-chain notification containing a private link to a claim form.
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By June 10, 23:59 UTC: Users must submit the completed form and confirm their receiving wallet address.
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Within 7 Business Days: Verified users will receive their USDC reimbursement.
Users who do not receive a form are advised to contact the Alex Protocol team via email.
Impact on Stacks (STX) Price
The exploit had a noticeable impact on the price of Stacks (STX) tokens. Following the news of the breach, STX saw a sharp decline, falling to $0.6532. The token experienced a 1.37% drop in 24 hours, a 9.64% decrease in a week, and a significant 31.12% reduction over the past month. This highlights the immediate market reaction and concerns regarding the security of the Stacks ecosystem.
Sources
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Alex Protocol to Reimburse Users After $8.3M Exploit on Bitcoin DeFi Platform, Cointelegraph.
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Bitcoin DeFi platform Hit by $8.3M Exploit, Promises Full USDC Reimbursement, Coindoo.
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Stacks [STX] down 31% after Alex Protocol exploit - Details, AMBCrypto.
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