How 0x Secures $200B with Harmony's AI AppSec agents
0x is the DeFi infrastructure layer behind Coinbase, Robinhood, MetaMask, and Phantom — moving more than $200 billion across 14 million wallets. After the ease and quality of their first security review, 0x rolled Harmony out across all their security surface areas. Their VP of Engineering, Chris Braun, on why: "I can actually see Harmony testing the code. It gives me confidence. I wouldn't do pentests another way moving forward."
Background
0x lets fintechs, wallets, and exchanges embed crypto trading with just a few lines of code, without building their own liquidity network. They have moved more than $200 billion across more than 211 million transactions, and security is foundational to how they are built and how they operate. To best support their growing customers, 0x keeps their applications safe with continuous security testing powered by Harmony's AI agents and human cyber experts.
The Challenge
0x isn't just protecting its own source code, it's protecting the millions of wallets and apps users that trust its infrastructure. Traditional cybersecurity vendors just weren't keeping up with the increasing risks of attackers exploiting vulnerabilities faster than ever. As Chris Braun put it: "traditional pentesters, they never know the application... they didn't really give me confidence that we had everything covered."
The Solution
Getting started with Harmony took almost no lift: as 0x Engineer Ahmed put it, "There wasn't much to do to get started — I just made a new branch." Then, Harmony's AI agents read every line of code, found vulnerabilities, and validated them dynamically against staging. This resulted in findings with clear prioritisation and close remediation support. That combination is what changed Chris's calculus: "when I see that you guys are looking at and evaluating the code, it means a lot because it builds confidence." 0x now leverages Harmony for security reviews across its full product suite, including its trading frontend matcha.xyz.
Key Benefits
AI agents read every line
Finds and dynamically validates vulnerabilities across the entire application.
Noise-free findings
High quality, noise-free findings with clear remediation guidance.
Low engineering lift
No new tool to learn or prompts to tune — just point to code and staging server.
About Harmony Intelligence
Harmony Intelligence builds AI agents that continuously battle-test your web app or API to find exploitable vulnerabilities. Our fully-managed continuous security testing platform empowers engineering teams to ship fast without worrying about waking up to a breach. We work incredibly hard as long-term infosec partners to keep you at the bleeding edge of AI and cybersecurity.