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
songsu
elpabl0.eth
contact ai
zorzalcripto
Rick
Amaan Sayyad
HashFit is a sportswear brand taking the Web3 cultural layer beyond DeFi, proof that physical consumer brands can be built natively on-chain from day one.
Open protocol and reference SDK for Ethereum transaction safety. Decode calldata, simulate, preview before sign. ERC-8265 (Prepared Transaction Envelope) reference implementation.
AI-powered tools and agents for the Powers Protocol: making it easy to create on-chain governed organisations and keep them adaptive through AI-assisted deliberation and reform.
On-chain AI compliance infrastructure for autonomous AI agents. Immutable audit trails, ZK-proof verification, and automated EU AI Act reporting (Articles 9-15, 50, 53, 72) deployed on Arbitrum One and 4 other EVM mainnets. 169/169 tests passing. EU AI Act enforcement deadline August 2026.
Eliezer Suite is an AI freight logistics platform on Arbitrum that reduces payment risk and fraud using confidential escrow, on-chain compliance, and digital Bills of Lading for secure trade.
Palpitada is live on Arbitrum since Dec/25 with a dual-engine prediction market — LMSR for cold-start liquidity + on-chain CLOB for liquid markets. Nobody else combines both. Add gasless EIP-712 transactions, native USDC settlement, $1 minimum bets, and a mobile-first PWA, and you get prediction markets that actually work on a phone — for everyone, everywhere. We're an Arbitrum Foundation grant recipient ($49k, Nethermind audit in progress). Beta in production, organic users, real volume. The hard tech is shipped: smart contracts, subgraph, EIP-712 gasless transactions, embedded wallets with social login, USDC settlement, PIX rails in Brazil — all built solo, all live on Arbitrum mainnet. Buildathon = scale what's already shipped.
Bivium turns your wallet into its own lending venue. You set the rate, you pick the collateral, and people borrow from you not from an anonymous pool. Built on EIP-7702, every wallet is a resting limit order. When risk shows up, it stays with the lender who signed it.
Delta-neutral vault capturing perp funding spreads on Nado and Extended. Exchange points distributed weekly to depositors. ~31% APY on USDC. https://atoma.fi/
Bastion is live security coordination infrastructure for Arbitrum and Robinhood Chain escrow-backed bug bounties with onchain-verifiable payouts, so researchers know the money exists before they hunt and projects can prove every payout. USDC held in escrow, reports hashed onchain, a six-stage disclosure lifecycle with 90-day windows, and a Launch Readiness Program that gives pre-mainnet projects a verifiable security history before they ship. New chains launch with zero security infrastructure; Bastion is built to be there from day one. Live at bastion.report.
Atrium is a 3-tranche principal-first primitive for on-chain RWA and yield-bearing stablecoins, targeting institutional LPs.
KwesPay is building the payment rails for the programmable economy, starting with Africa. Built with Arbitrum and designed for multichain commerce, KwesPay enables merchants to accept stablecoins and volatile crypto assets through seamless embedded checkout infrastructure with fast settlement, onchain verification, and borderless payments built for modern commerce. We’re turning crypto from speculation into real world payment infrastructure.
Middleware for Compliant Agents. The Layer that makes agentic interactions traceable to a human to enforce human accountability even in an agentic era