Open House Archive
Welcome to the Open House Archive - your central repository for accessing all previous Open House buildathons and projects.
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
Akan
Skia Variants
Rinat
StonkBrokers is an onchain launch + trading ecosystem built on Robinhood Chain Testnet that combines community formation, liquidity, and incentive-driven price action into one cohesive product. At the foundation is our fully minted-out NFT collection. The collection was intentionally designed as a go-to-market mechanism: it created an immediate, finite group of holders, aligned incentives, and a shared identity from day one. By minting out, it proved demand early and established a core community and user base that could later participate in token launches, trading, and liquidity. On top of that community layer, we introduced a token launch and exchange system, then extended it with call options to create reflexive incentives. Call options give users upside exposure to price moves, which naturally motivates participants to accumulate and support tokens they believe in—and, in practice, encourages “pump” behavior (buy pressure) because the payoff is directly tied to pushing spot price above the strike. At the same time, the system counterbalances speculation with lock-based yield incentives: users who want to earn yield from LP fee flows stake/lock their tokens (a lockup is required). That lock converts holders into long-term participants, reduces circulating supply, and aligns them with sustained trading volume and fee generation rather than short-term flips. The result is a flywheel: NFT holders bootstrap community and early participation Calls reward bullish conviction and incentivize demand/price expansion Token lockups for LP-fee yield restrict supply and promote long-term alignment Trading activity drives fees, which reinforces staking/yield participation
A universal cross-chain messaging protocol that positions Arbitrum as the central hub for multi-chain communication, enabling developers to build once on Arbitrum and reach users on any blockchain.
Making DeFi yield accessible to the next billion — starting with Africa.
An AI-driven onchain interactive confession quest where self-exploration is the core mechanic.Out of Jail 808347 is a narrative Web3 quest built at the intersection of AI, music, and blockchain — designed for a worldwide audience
Making DeFi yield accessible to the next billion — starting with Africa.
SettlX is a Web3 payment platform for global merchants in volatile markets like Nigeria. It lets them accept USDC and receive instant NGN settlements at a locked rate, eliminating FX risk completely.
ERC8004 verifier for Agents and Humans on Arbitrum
ERC8004 verifier for Agents and Humans on Arbitrum
A private "offline-first" chat app with built-in Post-Quantum ethereum wallet. Sign transactions and broadcast them over bluetooth mesh network to find a peer connected online to relay it to a RPC.
Hardware identity primitive for Arbitrum Stylus — binding ESP32-S3 silicon to on-chain execution. Sybil-resistant DePIN verification without TEE or secure elements.
Sentinel DAO is an on-chain treasury firewall powered by Arbitrum Stylus. We prevent treasury hacks by enforcing dynamic risk policies and trust scores at the execution level using Rust logic.
DeFi tokenized the asset side of finance but has no repo - the backbone of institutional funding. Repo Protocol brings title transfer and rehypothecation on-chain. The missing funding primitive.