Gitcoin Virtual Hackathon

Hack the Horizon

Nov 12, 2020 - Jan 18, 2021

This hackathon event had ended at Jan. 18, 2021, 7:59 a.m., please check the ongoing hackathons.

Hack the Horizon

Nov 17th - Jan 17th

Up to $50,000 in prizes

Hack the Horizon is a collaborative, creative, and inclusive cross-chain hackathon focused on building applications that utilize the Horizon Bridge. Our singular aim to work with Ethereum and Harmony developers to build the most interesting, useful, and innovative applications that take advantage of Ethereum and Harmony's strengths.

Go to the Harmony Discord Channel to connect with other hackers and with Harmony Devs.

What is Harmony?

Harmony is a proof-of-stake, sharded, EVM-compatible blockchain with 5 second finality and low costs (0.00001 fee).

What is Horizon?

Horizon is a bi-directional bridge that connects Ethereum and Harmony. Connecting these two vibrant communities enables the free flow of assets and protocols across each other and allows developers to take advantage of inherent strength in each protocol.


We are awarding up to $50,000 in Harmony ONE Tokens plus the addition of other prizes provided by our generous hackathon prize partners.

We have also partnered with Band Protocol to give a prize for Best Use of Band on Harmony: $3,000 ($1,500 in BAND & $1,500 in ONE).

Judges and Mentors

We've assembled an amazing list of judges and mentors to help you during the hackathon and to judge hacker submission after the hackathon. We're super thankful to each one for participating.


Join the Hackathon Airmeet to attend live events!

Before and During the Hackathon, we'll provide a series of workshops ranging from "how-to" to panel interviews with blockchain superstars, focused on helping you learn and succeed. Coming soon!


How long is the hackathon?

Nov 9, Open registration

Nov 17, Hackathon begins

Jan 17, Submission Deadline (11:00PM Pacific Standard Time)

Jan 18, Closing Ceremonies

Jan 19-24, Judging

Jan 25, Winners Announced

Who can participate in the Hackathon?

If you're a hacker, builder, designer we want you. The hackathon is open to individuals and small teams and must be 13 years or older to participate. Teams are limited to no more than 4 members.

I want to join a team, what do I do?

Before and during the hackathon, we'll provide ways for you to find other team members and to form a team. More details on this later.

What's up with the workshops?

Before and during the hackathon, we'll provide opportunities for developers and hackers to learn and apply what you're learning. We want you to learn and grow and, we hope, that you'll come up with an amazing app to submit for judging. Workshops will range from "how-to" to panel interviews with technical leaders in blockchain.

What are your submission requirements?

First and foremost, we want you to build on Harmony. Preference will go to submissions that utilize the Ethereum-to-Harmony Horizon Bridge. We'll publish a wish-list of applications we want to see on Harmony in a blog post soon. Of course, all submissions need to be linked to a public Github repository and if, selected, be ready to join demo day and present your submission as a team.

Do you have a grant program?

YES. Ultimately, we don't want a bunch of applications submitted that have no users and are dead-on-arrival. We want to continue to support a select handful of projects by fast-tracking them through our Grant program. One of the workshops will discuss our Grant process. More on that later. But, yes, we do have a Grant program and would love for all submissions to be sooooo gooooood that each one receives a Grant and further support after the hackathon.

So, I'm a retail token holder, a huge fan of Harmony, and a massive $ONE holder. Can I be part of this party?

Awesome. We appreciate your support. But, no. This hackathon is for builders only.

So, I thought Harmony was an Ethereum Killer. What's up?

Yeah, the phrase "Ethereum Killer" was never our favorite and we've never used it ourselves. Each chain has trade-offs and, frankly, why would we build a bridge only to tear it down? We want to work with our Ethereum partners and developers. That's how this whole ecosystem can grow is if we work together.

What's your Code of Conduct?

Glad you asked.

Be Respectful: Be kind to all participants and supportive of each other. No insults, verbal threats, or put downs will be tolerated. If you have to say something, be constructive. We're all here to learn. Go be a jerk elsewhere, not here.

Be Welcoming: We celebrate the open source community and that means we are welcoming. This hackathon is open to everyone in the world. So be cool and inclusive.

Do Something New: In an environment where everything is forked every farm imaginable is copied, do something different. If you fork something, that's ok but be sure to add your own flare to the fork. Add value, however you choose to do it.

What's your Discord Channel?

Go to our Discord Channel to connect with other hackers and with Harmony Devs.

bounty explorer
Check out the Prizes

Visit the Prize Explorer to check out the prizes posted by our hackathon sponsors. Click each prize to show important details, including the submission requirements, submission deadline, etc.

express interest
Join the Hackathons Chat Workspace

Chat with other hackers, ask sponsors and the Gitcoin team questions, find or create a team, and communicate real-time. Click here to join the party!

bounty explorer
Start Work via Gitcoin

When your team is formed please have one of your teammates navigate to each prize page you plan to compete for and click the “Start Work” button.

express interest

Build your cool ideas and make your vision come true with your team!

bounty explorer
Submit Work via Gitcoin

When your project is completed, submit your work by clicking the “Submit Work” button on the prize page/