It's June 2026, and the hackathon landscape has quietly become one of the most interesting places to be if you're building at the intersection of AI, Web3, and open infrastructure. Whether you have a half-baked idea or a production-grade prototype gathering dust, there's likely a competition with your name (and some serious prize money) on it.
Here are five virtual hackathons with open registration right now, plus what makes each one worth your time.
🏆 5 Virtual Hackathons Open for Registration Today
1. HackerNoon Decentralize AI Hackathon
Prize Pool:$51,750+ in cash, compute credits & ecosystem rewards
Timeline:Two rounds, June 2026 - October 2026 | November 2026 - February 2027
Enter at: decentralizeai.tech
This one is running on a mission. Organized by HackerNoon in partnership with Nosana, Arweave, and MEXC, the Decentralize AI Hackathon is for developers and early-stage startups building open AI infrastructure — decentralized GPU orchestration, permanent model storage, verifiable AI, open inference, data sovereignty tooling. The format is unusually flexible: you can submit a proposal, a prototype, or even a well-argued technical idea. Publish your work as a HackerNoon blog post, tag it #decentralize-ai, and you're in. The grand prize winner also receives full ownership of the decentralizeai.tech domain and codebase. Nosana compute credits and Arweave storage credits are available for participants to claim while building.
2. HackerNoon Proof of Usefulness Hackathon
Prize Pool: $150,000+
Timeline:Ongoing; ends August 2026
Sponsors:Bright Data, Neo4j, Algolia, Storyblok, HackerNoon
Enter at: https://proofofusefulness.com/submit
No pitch decks. No mockups. Just code that works. HackerNoon's Proof of Usefulness hackathon scores projects on real-world utility - traction, audience reach, technical innovation. The judging criteria are rigorous: does it solve a real problem, and do people actually use it? Projects are reviewed on a rolling basis, with the first set of winners already announced - read the announcement here. This one is open globally and welcomes both solo developers and teams.
3. Hack-Nation Global AI Hackathon
Prize Pool:$35,000+ in cash & credits
Timeline:Builds July 18–19 · Next application deadline: June 20 (Batch 4)
Enter at: hack-nation.ai
Hack-Nation runs a 24-hour AI product sprint with a post-event venture track for selected finalists. Previous participants have gone on to Y Combinator and raised seed rounds. The format: pick a challenge at kickoff, ship a working AI product in 24 hours, pitch live to judges. Selected teams then enter a structured program with customer discovery support, founder coaching, and investor readiness prep. Open to developers, researchers, and founders globally. Applications are free.
4. Sui Overflow 2026
Prize Pool:$500,000+ across core and sponsored tracks
Format:Global virtual hackathon (pre-registration open)
Enter at: overflow.sui.io
If you're building at the intersection of AI and decentralized infrastructure, Sui Overflow is the most generously funded open hackathon right now. Core tracks include autonomous AI agents on Sui's object model, financial primitives and payment rails, developer tooling and SDKs, and data applications on Walrus. No experience requirements - there are dedicated mentors and workshops per track.
5. Snowflake CoCo CLI Hackathon
Prize Pool:$10,000
Timeline:June 15 – August 2, 2026
Format:Virtual, Global
Enter at: hack2skill.com/event/cococlihack/
Run through Hack2Skill and Snowflake, this global virtual hackathon challenges developers to build AI-native applications and intelligent agents using Snowflake’s newly updated CoCo CLI platform. Teams build solutions across four core tracks: workflow automation agents, unstructured data systems, domain-specific AI copilots, and conversational data tools. You get access to live starter workshops and technical AMA sessions to help you deploy multi-step AI agents directly on top of enterprise data stacks. If you want to dive headfirst into building practical, agentic AI tools rather than just simple prompt wrappers, this one is absolutely worth your time.
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