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
A tokenized Real-World Asset (RWA) city-building sandbox powered by Arbitrum Sepolia & Robinhood testnet.
Programmable lending platform for tokenized stocks. Borrow against your tokenized stock. Custos pays the debt down while you sip your coffee, and it can never borrow or sell so no worries
Chroma is a launchpad and trading terminal live on Robinhood Chain mainnet. Launch a coin in one signature through Pons with the creator's buy first, trade any Robinhood Chain coin with live charts and contract checks, and earn on-chain referral fees on every trade.
Robinhood just declared the agentic-finance era — 30M agent transactions a day. Every one of them needs proof. We built it.
We are entering a world where artificial intelligence will touch nearly every part of life — how we work, learn, build, create, heal, and solve problems. That future is already being built. The question is who builds it, who owns it, and who benefits from it. Right now, the answers are troubling. AI development is fragmented and centralized. Access is expensive. Ownership is unclear. Trust is nearly impossible to verify. Creators struggle to protect what they build and earn from it. Businesses struggle to find reliable AI tools without assembling entire engineering teams. And communities are left consuming AI rather than owning, shaping, or benefiting from it. Joy Marketplace exists to change that. We're building the economic infrastructure for the agentic era — a decentralized Web3 marketplace where AI models, agents, datasets, workflows, tools, and digital assets can be protected, published, discovered, licensed, and monetized. A place where creators turn their intelligence into income. Where businesses find trusted AI solutions without the overhead. Where communities participate in the AI economy instead of being bypassed by it. The vision is simple, but the scale is massive. Joy Marketplace is becoming the Shopify + Hugging Face of Agentic Commerce — built not to trap creators or centralize control, but to return ownership to the people who earned it. Trust isn't a feature we bolted on. It's built into the infrastructure: blockchain-backed proof of ownership, smart contract licensing, decentralized identity, on-chain reputation, and AI-powered discovery — all running on Arbitrum with Stylus powering the contract layer. Intelligence should not be locked behind closed doors. Opportunity should not belong only to the largest corporations. The people creating the future should have a real stake in it. Welcome to Joy
Send and Recieve USDG money across the sea and instantly spendable to any of 44M+ indonesian QRis merchants. Simplest user onboarding with Passkey and Google sign in, no private keys, no seed phrase
Outlay is a payment scheduling app for USDG on Robinhood Chain. It lets you set up one-off or recurring payments by choosing a recipient, amount, and schedule, then funding them in advance.
MIST ER is a compliant privacy layer on top of USDG on Arbitrum. Zero-knowledge transfers stay hidden from the public, readable by the auditor of the reserve, and private even against quantum attackers.
Safety and execution orchestration for onchain vault rebalances. Built on Robinhood Chain with live liquidity, exact simulation, and fail-closed execution.
Layer 1 Bellguard verifies token origin on Robinhood Chain mainnet and testnet. Layer 2 Bellswap swaps on testnet only. Layer 3 is the bsX0 token layer, a USDG-collateralised synthetic. Unaudited.
Make your position capital efficient. Laxu tokenizes your perp positions on Robinhood Chain so you can borrow USDG against it and earn creator fees when others buy in.
Sell a pending Arbitrum withdrawal now instead of waiting 6.4 days. Exit Market proves it is real and unclaimed on-chain, against the rollup's own commitments. No oracle, no committee.