OpenZeppelin Defender is a mission-critical developer security platform to code, audit, deploy, monitor, and operate blockchain applications with confidence.

Integrating directly into the developer workflow, Defender makes it easy and fast for developers and operators to prevent and fix security issues pre and post-deployment.

Defender legacy is now deprecated in favor of Defender. Learn how to migrate here! On June 1st 2024, you will no longer have access to Defender 1.0 UI and API.

Available networks

Defender works with most mainnet and testnet networks, as well as local mainnet forks.

If there is any other network or layer-2 solution you would like to use from Defender, please reach out to us via the form on Defender!


You can check the status of Defender and the supported networks on our status page, where you can also subscribe to receive notifications. If a supported network experiences issues, some features in Defender for that network may not work properly.


Integrations throughout Defender allow users to connect with other services and tools. Find the list of integrations and more information here.

Service Level and Support Agreement

For our paid subscriptions, we’re offering enhanced service reliability, guaranteed uptime, and priority support. You can learn more on our Service Level and Support Agreement (SLA) page.


As a Defender user, your feedback is important! Please provide us feedback by accesing the form on the bottom-right corner of your screen.

Feedback form button bottom-right corner