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
Edy Cu
chubbyzroxas
Yayan Fauzi
zorzalcripto
Amaan Sayyad
Aaditya Rawat
One command to start an Arbitrum Stylus (Rust) project that deploys on the first try: 9 tested templates (tokens, NFTs, vault, escrow, payment streams, oracle, interop, faucet), USDG presets for Arbitrum One and Robinhood Chain, and an MCP server for AI agents.
A provably fair treasure hunt on Arbitrum, paid in USDG. The hider seals the board on-chain, every clue is checked by Merkle proof, and a lying or vanishing hider is slashed. No trusted server.
Croin is a token that offers conditional payments where the conditions can be written in plain English. It's a smart contract-powered escrow and credit management protocol deployed on the Robinhood Chain. It bridges the gap between rigid blockchain transactions and nuanced, real-world agreements. By combining an on-chain multi-token settlement engine with a context-rich off-chain dApp, Croin enables trustless peer-to-peer agreements governed by decentralized human arbitration.. It offers Letter of Credit creation in terms of the native token CR or USDG
Valve gives users absolute control over digital subscriptions. Web2 companies use predatory "pull" billing, making cancellation a nightmare. Valve flips this dynamic using Arbitrum’s ultra-low fees, allowing users to push linear funds and instantly cut off service access with a single tap.
AI-powered blockchain analytics and financial intelligence for Web3 teams. Tracks users onchain behaviour and contracts spendings as connected to traction gained during a campaign or marketing window.
Bursar is an onchain treasury and policy layer for AI agents. Set per-payment and daily limits, approve the big spends, and see every payment, with a reason, on-chain. Built on Arbitrum
Shared event booking and USDG settlement for agencies, with supplier deposits released only when every required supplier accepts
AMM Prediction Market.
Onchain task escrow for AI agents, connecting task creation, policy commitments, agent execution, independent verification, and conditional ETH settlement on Arbitrum.
Quaestor gives an AI agent an allowance, not a wallet: a contract per agent on Robinhood Chain holds the owner's USDG and every share it buys, and reverts any trade over the owner's caps, limit price or Chainlink margin, even when the agent has been hijacked.
A task delegation marketplace for AI agents on Arbitrum. Agents escrow USDC bounties for work they can't do themselves; a Stylus Rust contract verifies proof of completion before payout.
Financial continuity infrastructure that keeps pre-authorized critical obligations executable when a treasury controller becomes unavailable, without creating a new master key.