When: June 2–3, 2026
Format: In-person
Where: Hilton Istanbul Bomonti Hotel & Conference Center, Istanbul
IstanHack is the developer track inside Istanbul Blockchain Week, and one of the few hackathons in the calendar that genuinely sits at the East-meets-West crossroads – drawing builders from over 60 blockchain communities across Europe, MENA, and Asia. Türkiye’s position as the largest crypto market in MENA (nearly $200B in annual on-chain volume, per Chainalysis) means the audience composition is meaningfully different from the typical Western-Europe or US hackathon: more emerging-markets fintech, more stablecoin and remittance focus, more deal-making happening in the corridors than at the demo stage.
The hackathon runs across the two days of the main IBW summit, which gives builders direct access to the wider event’s programming – DeFAICon Istanbul (DeFi × AI), the RWA Builders Summit, and DealFlow Den for founder-investor matching. If you’re building something with strong relevance to emerging markets, this is the hackathon where that work actually lands with the right audience.
When: Registration closes June 6, 2026; qualifier June 7–10; build phase June 14–21; winners announced June 27
Format: Online / Async
This is an AI hackathon with growing crypto-adjacent participation – every team has to identify a real-world risk in their AI system (bias, misinformation, misuse, over-reliance) and design around it, which is exactly the framing that pushes builders toward verifiable execution, on-chain provenance, and decentralized coordination as solutions rather than afterthoughts.
The structure is unusually deliberate. Registration on Devpost doesn’t guarantee participation: every team has to pass a 30-minute AI Readiness Qualifier (no code required, just a written scenario walkthrough) between June 7 and 10. Teams that clear the qualifier get a week of actual building, June 14 to 21, with results announced June 27. The $15,000 prize pool is split across High School, College, and Graduate tracks at $5,000 each, plus USAII certification scholarships layered on top.
The catch worth flagging: this one is students-only. Full-time degree or doctoral students are eligible; working professionals enrolled in degree programs are not. If you fit, the multi-phase structure is one of the better-designed online hackathons running this year. Applications open until June 6.
When: June 4–5, 2026
Format: In-person
Where: Unicorn Factory Lisboa, Lisbon
VIBE-A-THON is a 24-hour AI build event running inside NFC Summit (June 4–6), organized by CoLab Lisbon in partnership with the summit. The premise is deliberately broad: builders, founders, developers, artists, and complete beginners in the same room for a day, with AI tooling carrying most of the technical lift. No prerequisites, no gatekeeping – the organizers’ bet is that the entry barrier in tech has collapsed enough that a beginner with the right tools and mindset can ship something real in a matter of hours.
The format runs two tracks. Creative AI focuses on image, video, and generative tools producing original visual, interactive, or cultural output, with selected projects featured in the Creative AI Showcase at the close of NFC Summit. Productivity (Startups & Agents) is the practical track – vibe-coding tools and mentor support turning ideas into working prototypes, with bounty prizes and a Grand Jury Prize on the line. AI tool specialists and developer advocates roam the floor; creative leaders, VCs, and partners sit on the jury.
The venue choice signals the vibe: 42 Lisboa is one of Europe’s most respected coding schools, free, peer-to-peer, project-based. Combined with NFC Summit’s broader programming (the 2026 edition adds the inaugural KAWAII summit and ACAI days for AI-creative crossover), this is a builder event embedded in a festival – closer in atmosphere to a creative residency than a typical 48-hour grind. Registration is via Luma and gated by token-ownership verification.
When: Submissions due June 11, 2026 @ 2:00 PM PDT
Format: Online
The largest agent-focused hackathon running into June, and the one with the most interesting prize structure. Instead of one giant pool with everyone competing for grand prizes, Google has split the competition into six partner-specific “buckets” – tracks aligned with Arize, Elastic, Fivetran, GitLab, MongoDB, and additional partner technologies. Each bucket awards $5,000 for first, $3,000 for second, $2,000 for third. That means a focused team building deeply against one partner’s MCP server can win without having to be the best submission overall.
The technical stack is Gemini 3 for reasoning, Google Cloud Agent Builder for orchestration, and the Model Context Protocol (MCP) for tool and data integration. The brief is explicit about wanting agents that move beyond chat: systems that reason, plan, and execute multi-step tasks under human oversight. Submission requirements are strict – functional agent integrated with at least one partner solution via MCP, public open-source repo, demo video, full Devpost form.
With 2,777+ registered participants and a global reach, this is one of the more competitive online builds running, but the bucket structure makes it more winnable than the participant count suggests. Open to all skill levels worldwide (with standard country exclusions). Deadline is firm.
When: June 9, 2026
Format: In-person
Where: New York, NY
Ecosystem: Monad
Monad Blitz is the Monad Foundation’s traveling one-day hackathon series – 40+ editions since May 2025 across Shanghai, San Francisco, Lagos, Lisbon, and now NYC during ETHConf week. The NYC edition keeps the same compressed format that’s defined the series: morning workshops to get builders up to speed on Monad’s high-performance EVM, seven hours of heads-down building, demos to the room, prizes to the winners. One day, no overnight grind.
The technical premise is Monad itself – a parallel-execution EVM-compatible L1 targeting up to 10,000 TPS, which gives builders a meaningfully different performance ceiling to design against than mainnet Ethereum. Whether that’s interesting depends on what you’re building: high-frequency onchain games, orderbook DEXs, real-time agent coordination, anything where Ethereum L1 throughput is the bottleneck. The Blitz format is deliberately beginner-friendly – Web2 devs new to crypto are explicitly welcomed alongside EVM veterans – and the “vibe-coding” framing means mentor support is built into the day.
Prize pool is $5,000 – small relative to ETHGlobal’s $225K running at Metropolitan Pavilion the same week, but the value proposition is different. Blitz is the direct line into the Monad ecosystem: founders, ecosystem leads, and investors actively building on Monad are in the room with you for the day. Registration is approval-required via Luma with wallet token-ownership verification, and capacity is capped. Apply early.
When: June 12–14, 2026
Format: In-person
Where: Metropolitan Pavilion, NYC
Ecosystem: Ethereum
ETHGlobal’s second flagship of 2026 lands in Manhattan with a structural change that’s bigger than it sounds. For the first time in ETHGlobal history, teams don’t have to start from an empty repo. The new Continuity Track debuts in NYC and lets builders extend an existing open-source repo or ship a new feature to an existing product – alongside the classic from-scratch path. It’s a meaningful acknowledgment that the most useful work in Web3 increasingly happens at the edges of existing systems rather than in green-field rebuilds.
The numbers are typical ETHGlobal flagship: 36 hours of building, $225,000+ in prizes, 15 partners. Google Cloud is in for $20K with cloud infrastructure, blockchain nodes, and onchain data tooling; World is in for $15K focused on private proof of human, financial infrastructure, and human-first experiences for the age of AI. Past NYC editions have featured Coinbase, Uniswap, Arbitrum, Polygon, Aave, Chainlink, and the rest of the protocol top tier as sponsors and mentors.
For builders who’ve been frustrated watching good ideas die at the 36-hour mark, the Continuity Track is the real story here – it lets you ship something with actual depth and a real upgrade path post-hackathon. Application deadline is May 29, which leaves a tight window if you’re reading this in late May.
Tracking Web3 Hackathons Worldwide
The hackathon as a 48-hour green-field sprint is quietly dying, and June 2026 is where you can see it. ETHGlobal’s Continuity Track – debuting in NYC – lets teams extend an open-source repo or ship a feature against an existing product, not just start from an empty folder at midnight. Google’s Rapid Agent splits its $50K pool across six MCP-partner buckets, so a team going deep on one integration can win without out-building everyone else. USAII won’t even let you touch code until you’ve passed a written qualifier on the problem you’re solving. Three different organizers, same direction: depth over adrenaline, post-event continuation over weekend demos.
That’s a real bet on what hackathons are for. The 2017-era version optimized for clever one-night hacks that mostly died Monday morning. The 2026 version is trying to produce things that ship. Whether the bet works is an open question – these formats are brand new, the bucket model fragments attention, and a qualifier filter cuts out the curious. But it’s the first month in a while where the format itself is the story, not the prize pools.
Explore the full interactive Web3 hackathon calendar on Web3Voyager with filters by ecosystem, format, and location. Hosting a hackathon, or know of one we missed? Submit it here and we’ll get it in front of thousands of active builders.
