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
Aaditya Rawat
Skia Variants
Akan
Etesia Research is building institutional-grade portfolio construction infrastructure for digital assets. Our platform enables users to access systematic investment frameworks through non-custodial tokenized vaults, bringing diversification, risk management, and quantitative portfolio construction on-chain. We believe the next phase of DeFi will be defined not by access to more assets, but by better tools for allocating capital across them.
KeySpot is a runtime credential security layer for agents, scanning checkpoints to detect and vault exposed credentials. No raw secrets persist in agent state. x402 enables per-call payments on Arb
CryptoSplitter is a decentralized Web3 application that lets groups split shared expenses on-chain. Whether it's a trip, dinner, or shared accommodation — simply create an event, add your friends' wal
A fully on-chain, FHE-encrypted 4-player card bluffing game with Russian Roulette elimination and USDC stakes. Built on Fhenix CoFHE. Deployed on Arbitrum Sepolia.
AI-agent-driven decentralized VC fund with automated yield and on-chain project auditing
Elysia-Perps is a Quanto-based perpetual exchange that makes ARB itself the settlement currency—deposit ARB, trade global assets, and settle PnL in ARB.
StockShield eliminates liquidations on tokenized stock perpetuals. Instead of liquidating, positions auto-rebalance within price bands when leverage gets risky. Built for equity-specific risks: overnight gaps, earnings volatility, market halts. AI agent monitors every position 24/7.
A self-custodial onchain firewall. The instant a verifiable threat hits, it auto-evacuates your funds — at rest in your wallet AND deposited in DeFi — to a vault only you control, inside the reaction window non-atomic hacks leave open. It turns the same EIP-7702 delegation attackers use to drain wallets into your defense. Live end-to-end on Robinhood Chain testnet: full GuardianModule + RulesEngine firewall, 90 tests, real Aave V3 exit fork-verified on Arbitrum One.
MiTanda puts the Latin American tanda, the rotating savings and credit circle used by millions, fully onchain. Members pool USDC or MXNB, and a smart contract holds the funds and pays out fairly each round, so no organizer can disappear with the money. No seed phrases, and it is live on Arbitrum One at mitanda.online.
Adjudex — AI-judged prediction markets on Arbitrum. Bet YES/NO with USDC against other users (peer-pool parimutuel — no house), and an AI judge settles the outcome with an optimistic, on-chain verdict anyone can dispute. Markets auto-ingest from real sports, esports, and crypto feeds.
Block one unsafe RWA agent trade and save proof in 60 seconds. 1 NO receipt names wallet and hashes, then links the refusal to Arbitrum Sepolia proof at https://refusalrail.veithly.workers.dev.