Colosseum runs the hackathons that Solana used to run itself, and it has spent three years being a Solana competition. This one is not. The Crypto World's Fair puts eight ecosystems on the same page and asks builders to pick one.

Crypto World's Fair dates

14 September to 12 October 2026 — four weeks, entirely online. Colosseum describes it as “a global, online competition where founders sprint over 4 weeks to build impactful products”, and as “an online hackathon bringing together builders and founders across blockchain ecosystems to launch breakout startups.”

Who is on the page

The ecosystem logos shown are Solana, Ethereum, Hyperliquid, Base, Tempo, Arbitrum, Zcash and Robinhood Chain.

What is actually on offer

Non-dilutive prizes and, for the teams that get through, a place in Colosseum's full-time accelerator with $250,000 in capital from its venture fund. The prize table itself had not been published as of 6 September.

The signal to read

The registration counter stood at 778 builders when we checked. That is early — the last Colosseum competition finished with a registration figure an order of magnitude higher, and most teams sign up in the final week.

A cross-ecosystem hackathon changes what a good submission looks like. In a single-chain competition the judges know the ecosystem's gaps and you can win by filling one; here the field is eight ecosystems wide, so a project whose whole argument is a chain-specific optimisation has to explain itself to a judge who does not share the premise. The teams that tend to do well in that format are the ones whose product makes sense to somebody who does not care which chain it is on, and which then have a specific, defensible reason for the chain they chose. The four-week length also matters: it is a business sprint as much as an engineering one, and Colosseum has been explicit for two years that it funds founders rather than repositories.

Crypto World's Fair

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