APIs present a security risk—that much is a given. Attacks on APIs have caused some of the most significant security incidents of the past decades. But the question now is: How can we flip the script and leverage their power to enhance security? Bybit might just have the answer.  

Bybit—one of the world’s leading cryptocurrency exchanges— recently leveraged the power of an API in the wake of a devastating security breach that resulted in a staggering $1.5 billion loss. This blog post explores how Bybit’s innovative API-driven approach is setting a new standard in cybersecurity and why API security is essential for today’s digital landscape.

The Heist That Shook Crypto

On February 21, 2025, Bybit detected unauthorized activity within one of its Ethereum cold wallets during a routine transfer. Upon inspection, they found that Lazarus Group, a North Korean cybercriminal gang, had exploited vulnerabilities stemming from a compromised Safe{Wallet} developer machine. By injecting malicious JavaScript into critical infrastructure, the attackers manipulated the smart contract logic, redirecting over 400,000 ETH and stETH—totaling more than $1.5 billion—to an unknown address.

The attack rocked the crypto world and stands as the largest crypto heist in history. The past half-decade has seen a string of major crypto heists, highlighting the inherent vulnerability of these platforms and, more importantly, the dire need for improved security and response efforts.

Source: https://www.comparitech.com/crypto/biggest-cryptocurrency-heists/ 

Bybit’s Swift API-Driven Response

However, the incident has had an unexpected silver lining. In response to the attack, Bybit released a revolutionary new API designed to help ethical security experts recover the compromised funds. Let’s dive deeper into Bybit’s response. 

Collaboration is at the core of Bybit’s API-driven response. The organization immediately recognized the need for rapid and coordinated action between external and internal security experts and, in light of this, released a groundbreaking API containing a “black list” of identified suspicious wallet addresses. The black list API is foundational to Bybit’s comprehensive Recovery Bounty Program and is designed to empower ethical hackers and security professionals to intercept fraudulent transactions quickly.

Bybit’s API initiative marks an enormous step forward for coordinated, industry-wide responses to security incidents. It has the potential to completely transform the way we respond to threats and is powered by the following features:

• Real-Time Threat Intelligence: The API allows security partners and white hats to receive continuous updates on malicious wallet addresses. This real-time data is critical in preemptively stopping further fraudulent activities, ensuring that any suspicious behavior is flagged and intercepted immediately.
• Automated Collaboration: Bybit’s API is not just a tool—it’s a bridge connecting a vast network of cybersecurity experts. Within just three days of the heist, Bybit received thousands of tips from industry peers, constituting an unprecedented level of collaboration. The API facilitates this response by automating the dissemination of vital threat intelligence.
• Incentivized Security Measures: To further galvanize the community, Bybit offers a 10% bounty for successful interceptions. This incentive not only rewards proactive measures but also underscores the vital role that a cooperative, API-driven ecosystem plays in modern cybersecurity.

How to Contribute to Bybits’s LazarusBounty Program

Want to join Bybit’s initiative? Just follow these steps:

• Link Your Wallet: To join, connect your crypto wallet to LazarusBounty. This lets you submit reports and see your contributions. 
• Find and Report Stolen Funds: Use the platform's live API updates, which provide real-time data from top blockchain analysis companies, to track stolen funds linked to the Lazarus Group. Report suspicious transactions or wallet activity. 
• Get Rewarded: If your report helps freeze stolen funds, you get 5% of the frozen amount. Another 5% is shared among everyone who helped, including exchanges and mixers. 
• Track Your Progress: See how you rank on the leaderboard based on your successful reports and frozen funds. Check the lists of "good" and "bad" actors to promote transparency. 
• Give Feedback: Help improve LazarusBounty by sharing your comments and suggestions. Version 2, with real-time tracking and more tools, is coming soon.

The Strategic Role of APIs in Cyber Defense

APIs have the potential to revolutionize the way organizations respond to security incidents. Bybit’s response to the $1.5B hack is a textbook example of this fact. APIs have powerful features that can transform your security strategy, including: 

• Enhanced Monitoring & Rapid Updates: With an API at their core, security systems can continuously monitor network activity, instantly flag anomalies, and update threat databases in real-time. This minimizes the window of opportunity for hackers to exploit vulnerabilities.
• Streamlined Incident Response: APIs' automated nature allows for immediate communication between disparate security tools and teams. When a suspicious transaction is detected, the system can quickly isolate the threat, reducing potential damage.
• Cross-Industry Collaboration: The Bybit incident highlighted the importance of shared security intelligence. APIs break down silos, enabling disparate organizations and individuals to contribute to a collective defense mechanism. This unified approach is essential for tackling sophisticated threats that often cross traditional boundaries.

Learning from Bybit’s Experience

So, what does the Bybit incident teach us? It teaches us that the digital battleground is constantly evolving on both sides of the fence. While attackers are growing more sophisticated and rendering traditional security measures obsolete, emerging technologies – like the Bybit API – are rapidly leveling the playing field. Bybit’s strategy—integrating real-time threat intelligence, automated updates, and industry-wide collaboration—illustrates the future of cybersecurity:

• Unified Defense Ecosystems: Collaborating is critical to effective incident response. The shared insights and rapid response enabled by Bybit’s API have shown that when security experts work together, they can mitigate even the most sophisticated and impactful attacks.
• Continuous Improvement: The ongoing updates and enhancements to Bybit’s API and its upcoming HackBounty platform reflect security’s dynamic nature. To truly protect against threats, continuous innovation, adaptation, and a willingness to learn from past incidents are essential. 

Conclusion

Bybit’s move to deploy a real-time API for blacklisting suspicious wallet addresses is transformative. It is not only helping to mitigate the fallout of a $1.5 billion crypto heist but also setting a new benchmark for the role of APIs in cybersecurity. This incident serves as a wake-up call for all organizations to invest in advanced API security solutions. In an era where digital threats are both complex and relentless, the power of APIs lies in their ability to provide rapid, automated, and collaborative defenses that keep hackers at bay.

For API security companies, the message is clear: embrace the API revolution. Equip your clients with the tools they need to detect, respond to, and ultimately stop cyber threats before they can inflict lasting damage.

Wallarm is the only solution that unifies best-in-class API Security and real-time blocking capabilities to protect your entire API portfolio in multi-cloud, cloud-native, and on-premises environments. With Wallarm, you can worry less about the costs of an API incident. Book a demo today to find out more.