About the Campaign

What is this?

A two-week builder competition where vibe coders and builders can build something creative and viral with Nansen API. Best build wins $10,000 USDC

Get double credits for any API purchase made between now and the deadline—that’s 100% additional credits on every dollar spent!

Who can enter?

Anyone who can build with Nansen API. If you can make an API call, you can enter.

You do not need prior Nansen experience, and you do not need to be a professional developer. Vibe coding and AI-assisted development are welcome.

What are the prizes?

• 🥇 1st: $10,000 USDC

• 🥈 2nd: Vibe Coder Stack: AirPods Max + Ledger Stax + Keychron Q Pro

• 🥉 3rd: Sony WH-1000XM5 + Ledger Stax

• Honorable Mentions: 100K API credits each

When does the competition run?

The competition will run for approximately two weeks from September 14th until September 27th—submissions close at 23:59 UTC.

Do I get free API credits for participating?

Every Nansen account gets 100 free API credits, but we have some special offers for the Meridian Buildathon:

• 1,000 free API credits: Claim 1,000 API credits through the Points hub

• Double API credits: Get 100% extra credits on your purchases in the campaign period

These offers are available from Sept 14th-27th.

Can I use the CLI?

Yes, you can use the CLI to explore and build with Nansen data. The CLI is powered by the Nansen API.

Building

What should I build?

Anything that uses Nansen data in a meaningful way.

For example:

• A game

• An AI agent

• An alerting system

• A wallet monitoring tool

• A trading or execution bot

• A research or profiling tool

• A dashboard or visualization

• Something we haven't thought of yet

The key requirement is that Nansen data should drive an important part of the build's functionality or logic — not simply be displayed as decoration.

Do I need to build a trading bot?

No, that's one option, not a requirement. Try building a game, a visualization, or a novel tool using Nansen data.

We’re encouraging users to be creative and try something new. Consider building a viral app, a creative visualization, or something completely new! Judges will consider how good a submission is at capturing attention and keeping users engaged.

If I build a trading bot, do I need real capital?

You'll need a small amount of your own capital to demonstrate the trade execution. The trades don’t need to happen live, but the demonstration needs to shows real trades.

What have other users built with the Nansen API?

Earlier this year Nansen ran a CLI builder’s campaign and catalogued some of our favourite submissions. View past submission here!

All work belongs to the original creators. Data powered by the Nansen API. The repos are user submissions and Nansen doesn't have any affiliation with the repos themselves.

Can I use AI tools to build?

Yes, vibe code it, use Claude, use Cursor, or whatever tool suits. We're judging the output, not the process.

Entry & Submission

How do I enter?

1. Create a Nansen API key

2. Log 1,000+ API calls against your key

3. Post your demo on X, tag @nansen_ai and the Github link. Include a 30–60s screen recording.

4. ❗️IMPORTANT: Submit via the the entry form — email, X post URL, GitHub link

When do submissions close?

Submissions close on September 27th, 23:59 UTC.

What should the screen recording show?

Your build running with live Nansen data visible. No narration needed - a judge should be able to follow it silently.

Does my GitHub repo need to be public?

Yes, judges need to review the code and README. Private repos won't qualify.

Can I submit more than once?

No, it’s one submission per account.

How do I get API access?

Sign up at Nansen during the sprint window.

Judging & Prizes

How are submissions judged?

Four criteria, equal weight: Data Integration, Functionality, Creativity & Originality, Documentation & Submission.

When are winners announced?

October 1st, 2026.

How are prizes paid?

• $10,000 first place paid in USDC.

• Physical prizes shipped internationally.

• Honorable mention credits applied directly to your Nansen account.

What if I win but don't have a Nansen account?

You'll need to create one to claim credits. Hardware prizes are claimed via the contact details you provided in the submission form.