Welcome to the OpenZeppelin Docs

The official documentation for OpenZeppelin Libraries and Tools

Smart Contracts
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OpenZeppelin Solidity Contracts

The world's most popular library of Solidity contracts for Ethereum and EVM blockchains. Battle-tested, community-reviewed, and trusted by thousands of projects worldwide.

Contracts Upgrades Icon

Upgrades Plugins

Deploy and manage upgradeable contracts with built-in safety checks and best practices

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Contracts Wizard

Interactive smart contract generator with security best practices built-in

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Contracts MCP

AI-powered assistant for smart contract development and security analysis

Open Source Tools
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Relayer

Enable gasless transactions and automate smart contract operations. Build better user experiences with meta-transactions and scheduled executions.

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Monitor

Real-time monitoring and alerting for your smart contracts. Get notified about important events, transactions, and state changes across multiple chains.

Transaction Proposal Icon

UI Builder

Create user interfaces for deployed contracts

Defender

Secure operations platform

Blockchains and Developer Ecosystems

Choose your blockchain platform to explore available contracts and tools

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Ethereum & EVM

Solidity smart contracts for Ethereum and EVM-compatible chains

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Starknet

Essential contracts library written in Cairo for Starknet

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Arbitrum Stylus

Essential contracts library for Arbitrum Stylus written in Rust

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Uniswap Hooks

Advanced Uniswap V4 hooks in Solidity

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Stellar

Soroban contracts library for Stellar

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Midnight

Privacy-preserving smart contracts for Midnight blockchain

Polkadot

Polkadot

ink! smart contracts for Polkadot and Substrate chains

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Zama FHEVM

Fully homomorphic encryption contracts for confidential smart contracts

Learn & Play

Master smart contract security through interactive challenges

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Ethernaut CTF

Learn smart contract security by hacking! A Web3/Solidity based capture-the-flag game where each level is a smart contract that needs to be 'hacked'. Perfect for learning vulnerabilities and security best practices through hands-on challenges.

Community & Support

Connect with the community for technical discussions and support

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Forum

Deep technical discussions, architectural questions, and detailed support. Best place for in-depth conversations about smart contract development, security patterns, and implementation details.

Telegram

Quick questions, community support, and real-time chat. Join our active community for faster responses, general help, announcements, and casual discussions about OpenZeppelin tools.