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
Hafiidh Luqmanul Hakim
The Pit is a prediction market you play like a fighting game. Instead of betting against an anonymous crowd, you go up against an autonomous AI fund manager we call the Pit Boss. You both draft a portfolio of tokenised stocks or crypto, stake USDG, and whoever's book is up more when the bell rings takes the pot. A round takes about sixty seconds.
HSwarm is a decentralized AI agent orchestration protocol on Arbitrum. It solves the ERC-8004 "reputation monopoly" problem where only top-reputation agents get hired. Instead, HSwarm randomly groups low-reputation agents into cooperative "Black Box" swarms, has them collectively analyze DeFi markets, standardizes their outputs via LLM, and then deploys ERC-4626 tokenized vaults on Arbitrum based on swarm consensus — all on-chain, automated, and governed by agent competition.
A composable DEX with HFT-grade liquidity for RWA.
Forward Contracts Platform
The Back-office platform for Humans and agents. Privacy preserving on-chain treasury & payroll
The agent economy is forming an open stack — MCP for tools, A2A for communication, ERC-8004 for identity, x402 for public payments — but every rail is public by design, broadcasting prices, balances, and revenue to anyone with a block explorer. For a real business, that's a non-starter. Velum adds the missing layer: confidential transfers on Arbitrum Stylus, where the two most commercially sensitive numbers — the price paid in each transfer and each agent's running balance — are kept private, proven with zero-knowledge and verified on-chain. Balances live as ElGamal ciphertexts that only the key holder can decrypt — no committee, no coprocessor, no master key, which is the key difference from FHE-based confidential tokens. It plugs into the agents you already run in a few lines of SDK: your agents don't move into Velum, Velum integrates into them.
Autonomous ERC-7857 agent on Robinhood Chain (Arbitrum Orbit). LP Guardian uses TEE-verified AI to diagnose LP risks & secure migrations, providing verifiable on-chain liquidity protection.
FounderSea is a decentralized idea funding & development platform built on Mantle
Bastion Protocol is an autonomous threat detection agent deployed on Robinhood Chain (Arbitrum Orbit L2, Chain ID 46630). It monitors the mempool in real time, scores every block using an 8-element feature vector, runs a 4-state FSM (NORMAL→ELEVATED→TRIPPED→COOLDOWN), and writes hash-committed detection proofs on-chain before exploits confirm. 5,880 scan cycles. 24/7 on Railway. 2 smart contracts deployed. 11 Alchemy components. 5 exploit patterns detected. Telegram alerts. Zero-cost gas-sponsored attestations. DeFi lost $1.8B to exploits in 2025. Flash loans, oracle manipulation, reentrancy, rug pulls, and MEV sandwiches execute in seconds. Existing tools alert after funds are gone. Bastion detects before the transaction lands.
Sellers publish AI agents. Buyers hire them in one wallet signature. USDC settles on Arbitrum the same block. Optional FHE-encrypted memory carries state between iterations.
Dynamic LP protection instead of guaranteed wipeouts!! A Partially Active AMM with zero-liquidation lending, powered by a high-performance Rust kernel on Arbitrum Stylus.
ROSA digitises rotating savings circles (Sou-Sous) on-chain using Arbitrum Stylus & ZeroDev Passkeys: features gasless onboarding, multi-chain support, and smart collateral default protection.