When: Submissions due May 6, 2026 (async build; submissions wrap early May)
Format: Online / Async
Ecosystem: Ethereum
ETHGlobal’s latest flagship is built entirely around the agentic paradigm – and it’s one of the most technically ambitious online hackathons running right now. Open Agents challenges builders to move beyond single-prompt AI interactions and into genuinely decentralized agent architectures: systems with onchain identity, autonomous coordination, verifiable execution, and composable decision-making.
The sponsor roster tells you where serious ecosystem investment is flowing – 0G, Uniswap Foundation, and World are all running dedicated tracks, meaning builders can target specific bounties aligned with their stack rather than competing for a single prize pool. That structure also makes it unusually accessible: a strong, focused submission in one track can win even without competing on every dimension.
The async format is a genuine advantage for international teams. No time zone sprint required – you build on your own schedule through early May. If you’ve been watching the AI-on-chain space develop and haven’t found the right entry point, this is it. Applications still open.
When: Phase 1 through May 7, 2026 (Phase 2 continues into June; awards in June)
Format: Hybrid / In-person finale option
Where: MIT Media Lab, Cambridge, MA + Global
A competition to build the missing infrastructure layer for AI agents — battle-tested in a networked decentralized arena across multiple challenges. Ideal for builders focused on coordination, scalability, and real-world agent deployment, with natural overlaps into Web3 and decentralized systems. Hosted by MIT Media Lab and HCLTech.
When: May 5-7, 2026 (72-hour sprint)
Format: In-person
Where: Miami, FL (Consensus Miami show floor)
Co-located with Consensus Miami, this is as high-visibility as in-person hackathons get. EasyA has built a reputation for running well-organized, sponsor-rich events where builders get genuine face time with protocol teams, investors, and ecosystem leads.
The 72-hour format is intense but well-suited to the Consensus environment: the conference floor gives you access to advisors and subject matter experts that you’d normally only meet through warm introductions. Teams that have used previous EasyA events well have walked away with both prize money and investor conversations that continued well past submission day.
Spots are limited and have been filling fast as Consensus Miami draws closer. If you’re planning to attend the conference anyway, building while you’re there is an obvious move. If you’re flying in specifically to hack, the combination of prize potential and network density makes it worth the trip.
When: May 7–9, 2026
Format: Hybrid (in-person option available)
Where: Jakarta, Indonesia + Online
While much of the agentic AI conversation stays theoretical, this hackathon makes production-readiness a core judging criterion. The focus is on agents that solve specific, demonstrable real-world problems – and a significant portion of submissions incorporate Web3 components for payments, onchain execution, or decentralized coordination, which is what lands it in the blockchain category on Devpost.
Jakarta as the anchor city is a deliberate signal: Southeast Asia’s developer community is large, technically strong, and underrepresented in the global hackathon circuit. The hybrid format keeps it genuinely global – online participants compete on equal footing – but the in-person component in Jakarta gives the event a regional gravity that most async builds lack. $15k prize pool. Open to solo builders and teams at any experience level.
When: May 8–10, 2026
Format: In-person
Where: Municipal House, Prague
Ecosystem: Ethereum
ETHPrague has quietly become one of Europe’s most respected Ethereum events – not the largest, but consistently one of the most technically serious. The Municipal House venue in central Prague sets a tone that’s a long way from the typical convention center: it attracts builders who are there to work, not network for the sake of it.
The programming centers on network economies, DeFi innovation, sustainability, and real-world impact themes that reflect a maturing Ethereum ecosystem moving past speculative narratives into infrastructure with lasting utility. Three days of talks, workshops, and dedicated hacking time, with a builder community that skews toward protocol depth rather than consumer apps.
For European-based developers especially, ETHPrague offers something harder to find at larger events: a focused environment where you can actually get deep on a problem, get meaningful feedback, and ship something you’re proud of by the end of the weekend. Registration and applications are open.
When: May 8–10, 2026 (pre-bootcamp May 3–7)
Format: Hybrid (~50 IRL hubs worldwide + remote)
Ecosystem: Solana
dev3pack’s model is worth understanding before you write it off as a student event. Yes, it skews early-career – but the infrastructure behind it is serious: ~50 physical hubs across multiple continents, a pre-hackathon bootcamp week that actually prepares teams rather than dropping them cold into a sprint, and direct pipeline connections to Colosseum-style accelerator programs.
The Web3 and AI tracks are genuinely broad, with Solana alignment giving Solana-native builders a natural home. But the real draw is the mentorship density and the post-hackathon pathways. For builders who are earlier in their journey and looking for an event that invests in them rather than just collecting submissions, this structure is hard to beat.
When: Submissions due May 11, 2026
Format: Online / Global
Ecosystem: Solana
Colosseum’s Frontier is the Solana ecosystem’s flagship builder competition, and with 14k+ historical participants it operates at a scale that few online hackathons match. The prize structure and ecosystem visibility that come with a Colosseum win are substantial – past cohorts have gone directly into accelerator programs and early-stage funding conversations.
The build window is still open, which means teams can still enter, get organized, and put together a meaningful submission before May 11. The scope is wide: high-impact dApps, DeFi primitives, consumer applications, and agentic tools on Solana all have competitive tracks. If you’ve been sitting on a Solana idea, this is the deadline to build around.
When: May 13–20, 2026 (online build May 13–19; onsite finale May 19–20)
Format: Hybrid
Where: Online + Milan, Italy (Fiera Milano)
lablab.ai’s Agent Olympics leans into the competitive framing deliberately – this is less about exploration and more about shipping production-grade agent systems that hold up under scrutiny. The emphasis on enterprise and market-ready use cases means the judging bar is real-world performance, not just technical cleverness.
The Web3 overlap is organic: teams building agents for trading, payments, DeFi execution, or onchain coordination find natural homes in the evaluation criteria. The Milan finale gives the event a physical endpoint and a moment of genuine visibility for the top teams, even for participants who built entirely remotely. $15k prize pool. Open to solo and team entries.
When: May 15–17, 2026 (48 hours)
Format: Online
Ecosystem: Midnight
Midnight occupies a specific and underexplored niche: a privacy-focused blockchain built around selective disclosure, letting users and applications reveal only what they choose to reveal, For builders who’ve been frustrated by the privacy tradeoffs in mainstream EVM development, Midnight represents a genuinely different design space.
This MLH-partnered 48-hour event is structured to be accessible – beginners are explicitly welcomed alongside experienced blockchain developers. Prizes go beyond cash: accelerator spots, ecosystem fellowships, and direct Midnight network invites make this valuable for builders who want to go deep on privacy infrastructure rather than collect a one-time bounty.
When: 6-week program, submissions due May 25, 2026
Format: Online
Ecosystem: Bitcoin
A 6-week builder program focused squarely on Bitcoin-native finance. Three tracks: Bitcoin (yield, lending, payments, treasury tools), MUSD (consumer experiences powered by Bitcoin-backed stablecoin), and MEZO (staking, governance, liquidity, and new utility models). Every project must integrate MUSD and MEZO, and a working demo deployed on testnet is required for submission. Organized by Encode Club in partnership with the Supernormal Foundation. $30,000 in veMEZO prizes, with additional incentives for teams that keep building after the program ends. Builders can still register during the early weeks.
Tracking Web3 Hackathons Worldwide
The spread across this list reflects something real about where the builder ecosystem is in 2026: the monoculture is gone. A single month contains serious Ethereum infrastructure work in Prague, Bitcoin-native finance with Meno, privacy-first dApps on Midnight, and fully autonomous agent systems at MIT – each pulling from distinct communities, distinct stacks, and distinct theses about where the industry goes next.
Explore the full interactive Web3 hackathon calendar on Web3Voyager with filters by ecosystem, format, and location. If you’re organizing a hackathon (or know of one we missed), submit it here to reach thousands of active builders.
