The standard for secure onchain applications at any scale. Build, secure, and operate across 30+ chains with OpenZeppelin Contracts and open source tools. Lock down your code with our gold-standard smart contract and blockchain infrastructure audits.

Connect with other builders, talk to teams looking for talent, meet your users, or showcase your app at the Ethereum World’s Fair. Explore what Ethereum is for and what it enables, test applications, and win in some fun challenges.