Open House Archive
Welcome to the Open House Archive - your central repository for accessing all previous Open House buildathons and projects.
Builder Highlight
Most Hackathon Won
Most Project Built
Welcome to the Open House Archive - your central repository for accessing all previous Open House buildathons and projects.
Most Hackathon Won
Most Project Built
Manobendra Mandal
Vivek Sahu
simp1e
zorzalcripto
zcy22606
David Barasa
Plexi is a composable ERC-4626 vault on Arbitrum that lets users deposit USDC and automatically gain exposure to yield strategies with real-time transparency. Instead of leaving capital idle or manually chasing yields, Plexi aggregates deposits, allocates them into a strategy, tracks TVL, shares, and hedge ratios on-chain, and provides a clean dashboard to monitor performance. The current MVP focuses on core vault mechanics—deposit, withdraw, and live stats—serving as the foundation for future integrations with protocols like GMX (GLP) and Hyperliquid for real yield and automated hedging.
A SuperApp for Payment and Loyalties
Yield Sphere Mini App is an AI-powered SocioFi companion that simplifies one of DeFi’s most complex protocols: Pendle. Built as a Farcaster mini app during the buildathon, it turns advanced concepts like yield tokenization, principal and yield tokens, and even stablecoin innovation into interactive, conversational learning. With chat-based guidance, structured lessons, and gamified quests, Pendle Agent lowers the barrier to understanding and experimenting with yield strategies — while helping onboard more users and transactions to the Arbitrum ecosystem.
Yield Sphere Mini App is an AI-powered SocioFi companion that simplifies one of DeFi’s most complex protocols: Pendle. Built as a Farcaster mini app during the buildathon, it turns advanced concepts like yield tokenization, principal and yield tokens, and even stablecoin innovation into interactive, conversational learning. With chat-based guidance, structured lessons, and gamified quests, Pendle Agent lowers the barrier to understanding and experimenting with yield strategies — while helping onboard more users and transactions to the Arbitrum ecosystem.
ZapGift is a decentralized peer-to-peer micro-gifting platform on Arbitrum, enabling users to send ARB-based gifts with customizable messages stored on IPFS . It supports charitable donations also
Flabitrum is not just another dApp — it’s a playground. We’re bringing back the raw fun of simple, addictive games and mixing it with the power of on-chain rewards. No confusing jargon, no boring dashboards — just instant fun, friendly competition, and provably fair outcomes secured by crypto rails. Whether you’re here to play, stake, or flex your streaks, Flabitrum gives you a reason to come back every day. Every tap, every choice, every move is on-chain — meaning your wins are yours to keep, trade, or show off.
Stogram is a Social x Predictions platform that blends content creation, prediction markets, and staking into a single, creator-driven ecosystem that aims to prioritize user privacy and monetizing engagement.
Smart Cross-Border Remittances, Send money globally with AI-powered FX hedging. Minimize volatility risk while maximizing recipient value through intelligent hedge ratios on Arbitrum
A SuperApp for Payment and Loyalties
Smart Cross-Border Remittances, Send money globally with AI-powered FX hedging. Minimize volatility risk while maximizing recipient value through intelligent hedge ratios on Arbitrum
SmartCache is an automated caching-as-a-service system for Arbitrum Stylus contracts. It allows developers to optimize contract performance directly from their code, without needing to manually interact with the CacheManager through a GUI or CLI. Using a simple annotation such as #[auto_cache], developers can indicate which contracts or functions should be evaluated for caching. An off-chain service then handles the entire process: benchmarking gas usage, analyzing cost-efficiency, and submitting a bid through Arbitrum’s CacheManager if the caching decision is financially beneficial.
Connect your X account and turn followers into rivals. Challenge them to epic games, let others bet and spectate live, and finally prove who’s the best - no talk, just play and win.