Robinhood serves 28 million users. They chose Arbitrum.

BlackRock manages $12.5 trillion. They chose Arbitrum.

Ubisoft builds for 134 million players. They chose Arbitrum.

In four days, you could build what comes next.

Open House India IRL connects the world’s largest pool of builders with the infrastructure that the world’s largest companies stake their reputations on.

Four days in Bengaluru for teams who turn ideas into products.

Four days working with teams that have delivered billions in value.

Four days building in an ecosystem designed for growth.

Four days that could change everything.

Build the way you think.

Write in Rust, C++ or Python with Stylus. Use Solidity if that’s home. Deploy on Arbitrum One for shared liquidity or chart the path to a custom Orbit chain if your design calls for dedicated blockspace.

DeFi. Gaming. Social. Developer tools. Something no one has seen yet.

What you build, that’s up to you. And you won’t be building alone.

Work side-by-side with Arbitrum engineers and founders who have gone from zero to one, with support from the Ethereum Foundation, OpenZeppelin, Couchbase and Appwrite.

Expect focused morning checkpoints, intensive build sessions, technical workshops and mentorship that will sharpen the narrative and the code.

Prizes recognise outcomes.

First place takes $40,000. Second takes $20,000. Third takes $10,000.

But winning is just a milestone, not the finish line.

Because the competition is just the beginning.

Demo day connects winning teams with VCs who back this space. Outstanding projects will be fast-tracked into Arbitrum's growth programmes. Exceptional work opens doors to ecosystem partnerships that extend far beyond the event.

The foundation is ready. The ecosystem is waiting.

Now it’s time to build.

Build in Bengaluru. Build Everywhere.

Arbitrum Everywhere.