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
We pay you to surf the internet. Literally! The world's #1 AI web activity data aggregation & rewards layer. Surf • Train • Earn.
Spendkit lets AI Agents make payments within limits set by their owners. Users keep funds in their own Payment Wallets, set an onchain spending policy for each Agent, and monitor activity in one dashboard. The current demo runs on Arbitrum Sepolia with Paxos Test USDG.
Mandate is an authorization and execution control plane for autonomous financial agents. AI agents can already discover markets, choose trades, and sign actions. The missing layer is proving that a specific action is actually within the authority granted by the human or institution behind that agent. A valid agent signature proves identity; it does not prove permission.
Session-aware collateral risk layer for tokenized equity on Morpho Blue, built for Robinhood Chain
Deterministic invariant detection for DeFi protocols on Arbitrum — replay a seeded op sequence against real on-chain state, re-check every invariant after each op, and store violations as verifiable on-chain receipts
PulsarFi - 1:1 Asset-Backed Indonesian Equity (IDX) Tokenization
Engineered to bring bank-grade privacy to decentralized finance. Unlike standard mixers, depositors can generate viewing keys to grant specific counterparties or auditors on-demand decryption access.
Risk layer for Robinhood Chain: a live sell test and Risk Level for every token, a can't-sell gate in our Desk and non-custodial bots that stop buying traps. Own node, open contracts.
Session keys, not wallet keys — a Stylus (Rust) vault that cages AI trading agents with hard on-chain limits.
Chains can only push, so stablecoins have no subscriptions and no chargebacks. Standing is a capped, revocable onchain mandate where each charge sits in escrow through a reversal window, and the right to reverse is earned through clean payment history.
Accounts-payable escrow: funds stay locked until payee+amount match; mismatch holds; replay is already_settled. Angular+Solidity. Live on Vercel; Arbitrum Sepolia for this buildathon.
OnStock is a cross-chain trading infrastructure for tokenized stocks (RWA). Same stock, different chains, different issuers, different prices — OnStock finds the best price and executes cross-chain swaps automatically.