Securely Code, Deploy and Operate your Smart Contracts

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From testnet to mainnet, at any scale.

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Trusted by the world’s leading projects

Code

Comprehensive developer security: from day one to audit

Battle-tested Contracts

Develop using security best practices, community-vetted libraries, and the most commonly adopted ERC standards.

Explore Contracts Library

Security on every Pull Request

Automatic code analysis for differences, vulnerabilities, improvements, gas costs, and test runs. Powered by machine learning intelligence and state-of-the-art tools.

Scan your project

Deploy

Test, execute, and verify deployments and upgrades across chains securely, by adding just 5 lines of code to your Hardhat and Foundry configuration

config.js deploy.js

// hardhat-config.js
require('@openzeppelin/hardhat-upgrades');
require('dotenv').config();
  
module.exports = {
    defender: {
        apiKey: process.env.API_KEY,
        apiSecret: process.env.API_SECRET,
    }
}

 import { ethers, defender } from "hardhat";
    
 async function main() {
    const Box = await ethers.getContractFactory("Box");
    const deployment = await defender.deployProxy(Box);
    await deployment.waitForDeployment();
    console.log(`Contract deployed at ${deployment.getAddress()}`);
 }

Transact, Monitor, and Automate

Operate applications from testnet to mainnet, at any scale

Relayers

Send onchain transactions with ease via dashboard UI, API, or SDK. Automate signing and approvals in compliance with your policies. Defender does the heavy lifting of monitoring the transaction lifecycle, optimizing gas fees, repricing, and resubmissions.

Send a transaction

Monitor

Gain full visibility into your smart contracts' risks and behaviors. Detect threats, get alerts on threats and anomalies, and automatically respond and resolve issues.

Monitor your contacts

Extend the Defender platform with custom code

Use Actions to implement custom app logic for on-chain and off-chain operations. Enable automated response to threats detected by OpenZeppelin's Monitor.

Create your first Action

+30 networks supported

Ethereum, Polygon, Arbitrum, Optimism, ZKSync, Moonbeam, and many more

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Native integrations with your favorite tools

Defender seamlessly integrates with your existing tools and workflows, so you can easily operate and secure your project throughout the whole development lifecycle

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