Arbitrum Open House — London
Arbitrum Open House 2026 — London 🇬🇧
Arbitrum Open House 2026 is a global builder experience touring across four cities (New York, London, Singapore, and Dubai) with $1.8m in prizes and bi-annual in-house mentorship programs.
Following a high-impact kickoff in New York City with 88 teams participating, we’re now bringing that energy to London, one of the most dynamic and fast-growing builder ecosystems in the world.
Whether you're just getting started or already deep in the stack, Open House is designed to meet you where you are and help you go further.
About This Event
Arbitrum Founder House is an application-only, in-person experience designed for teams building seriously on Arbitrum and looking to turn momentum into real execution.
It comes with $415k in prizes and grants up for grabs for the winning projects across Open House London Buildathon and the IRL Founder House. Please note that the exact prize and grant details, amounts, and conditions are subject to change and will be updated.
If selected, you’ll join us in London from July 10 – 12, 2026 for a focused, high-touch program built around collaboration, mentorship, and shipping.
The Founder House is part of the broader Open House journey:
The Buildathon runs from May 25 – June 14, 2026
Teams who participate in the Buildathon are fast-tracked
Applications are open to all eligible teams
📌 Round 1 applications for Founder House close on June 10, 2026
This Luma form is for builders interested in participating in the IRL Founder House.
What to Expect
Across the Open House journey, participants can expect:
Direct access to the Arbitrum Foundation, Offchain Labs, and ecosystem mentors
Structured support around execution, GTM, and fundraising readiness
Dedicated time to build alongside other top teams
An environment built for focus, momentum, and real progress
Who Should Apply
Founders and early-stage teams exploring scalable onchain products
Developers building or interested in building on Arbitrum
Builders who value hands-on learning, collaboration, and shipping
Both solo builders and teams are welcome.
Important Information
Selected participants will receive full event details well in advance of the Founder House
Limited seats: applications will be reviewed based on quality, intent, and alignment with Arbitrum
Event logistics, swag, meals, and on-ground support will be provided
More details about the Open House program can be found here:
👉 https://openhouse.arbitrum.io/
Media Release
By attending, you grant the event organizer and its affiliates the right and permission to use and publish, in any media or format, for any lawful business purposes, your image, likeness, name, voice, and other identifying characteristics as captured at the event, without compensation or liability. Please refer to Arbitrum’s privacy policy for more details.