Hackathons
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Arbitrum Open House 2026A four-city global builder program from the Arbitrum Foundation with $800,000 in prizes plus a $1,000,000 commitment from Robinhood Chain for teams building on its testnet, combining a multi-week online buildathon with in-person Founder Houses in each city.
$1.8m
Always open
Hackathon
Colosseum Crypto World's Fair HackathonColosseum's first multi-chain online hackathon, September 14 to October 12, 2026, with ecosystem prize tracks for Solana, Ethereum, Hyperliquid, Base, Tempo, Arbitrum, Zcash and Robinhood Chain, a general cross-chain prize pool, and a path into Colosseum's $250K accelerator for Solana-integrated winners.
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Oct 12, 2026
Hackathon
DevfolioA hackathon hosting platform, India-centric but global, running its own flagship events like ETHIndia alongside hundreds of organiser-run hackathons with Ethereum, Base and Starknet sponsor tracks.
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Always open
Hackathon
Encode ClubA free, community-run hackathon organiser running chain-specific events (Hyperliquid, Solana, Arc/Circle) across Europe and beyond, that also runs a separate 8-week Solana accelerator sourced from its hackathon pipeline.
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Always open
Hackathon
ETHGlobalEthereum's largest hackathon series, running in-person and online events worldwide with sponsor bounties across every major chain and L2, plus Pragma founder summits alongside major events.
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Sep 27, 2026
Hackathon
This month and next
Deadlines
2 closing