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Open House Archive

Welcome to the Open House Archive - your central repository for accessing all previous Open House buildathons and projects.

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Project Highlight

Project Highlight

EduBricks

EduBricks is a platform enabling fractional ownership of tokenized real estate, making investments more accessible

Champion

7th Place

Arbitrum X EDU Chain Mini-Hack

Pencil Finance

Bringing $3 Trillion in Student Loans On-Chain

Champion

1st Place

Arbitrum X EDU Chain Mini-Hack

Stylish Course to Stylus Smart Contract Development

A comprehensive course on deploying and interacting with Stylus smart contracts on Arbitrum and EDU Chain, featuring a full-fledged Stylus IDE for seamless deployment and interaction.

Champion

First Prize

Arbitrum X EDU Chain Mini-Hack

VineFinance

Vine Finance is a decentralized, modular revenue strategy protocol.

Champion

Third Prize

Arbitrum X EDU Chain Mini-Hack

Orbital

A next-gen AMM that supports 2, 3, or even 10,000 stablecoins in a single pool, scaling concentrated liquidity into higher dimensions.

+1
Champion

Second prize

Arbitrum Open House India: Online Buildathon

zkArb SDK

zkArb SDK is a developer toolkit that makes building zero-knowledge apps on Arbitrum simple and fast. It provides plug-and-play Circom circuit compilation, proof generation, and ready-to-deploy verifier contracts, so developers can focus on dApps instead of cryptography.

Champion

Honorable Surprise Mention

Arbitrum Open House India: Online Buildathon

Orinx

Orinx allows users to receive, hold, and send funds onchain while protecting their financial privacy.

Tech StackReact, Next, Vue, Web3, Ethers, Node, Solidity
Builder
SShubham
DeFiInfraOther

Megamint

A transparent, on-chain lottery and giveaway platform that lets creators and projects engage their fans with fair, verifiable, and fun community experiences.

Tech StackReact, Ethers, Solidity, Web3
Builder
KKen Juniour
GamingNFT

TXExplain

TXExplain is a transaction explainer project that generates a fully detailed explanation of a transaction on Arbitrum One using the transaction hash

Tech StackEthers, Web3
Builder
JJoel Akudike
DeFiDAOAIOther

Quid

imagine what the biggest Uniswap pool could be

Tech StackReact, Next, Solidity, Ethers, Web3
Builder
RRichard Tiutiun
DeFi

bitchat - dstealth

A private "offline-first" chat app with built-in Post-Quantum ethereum wallet. Sign transactions and broadcast them over bluetooth mesh network to find a peer connected online to relay it to a RPC.

Tech StackRust, Solidity, Swift, Helios, TOR, Dilithium , ML-DSA44, BLE mesh
Builder
TTanto Defi
SocialFiDeFiInfra

RoboLend

Borrow WETH against tokenized equities on Robinhood Chain.

Tech StackSolidity, Next, React, Rust
Builder
MMintu Gogoi
DeFiRWA

Minimax

Multi-DEX LP Battle Arena on Arbitrum where liquidity providers compete head-to-head in time-bound PvP matches.

Tech StackReact, Web3, Ethers, Solidity
Builder
CCapin Ho
DeFiGamingAI

Detective

Farcaster native game (mini app) where players wager ETH spotting AI clones. Built on Arbitrum with Solidity + Rust for on-chain reputation & Proof of Humanity.

Tech StackReact, Next, Rust, Web3, Ethers, Node
Builder
Ppapajams
GamingAI

Diversifi

Get stable, or die trying! Diversifi leverages real world assets like gold on arbitrum alongside global & regional stablecoins on celo to enable users to protect their savings & income from inflation

Tech StackReact, Next, Web3, Ethers, Node
Builder
Ppapa jams
DeFiAIRWA

Doba

Doba is an onchain audio streaming service.

Tech StackNext, Solidity, TypeScript, Alchemy Account Kit, LayerZero (OApp v2), Arbitrum One, Base, Vercel
Builder
IIan Njuguna
DeFiNFTRWA

Repo Protocol

DeFi tokenized the asset side of finance but has no repo - the backbone of institutional funding. Repo Protocol brings title transfer and rehypothecation on-chain. The missing funding primitive.

Tech StackSolidity, Ethers, Web3, React
Builder
AAJ Park
RWADeFiInfra

Stealthpay

Instead of turning the blockchain into a fully opaque privacy layer (which undermines the transparency that made blockchains valuable in the first place), we built StealthPay—an opt-in privacy primitive for users who don’t want their on-chain activity easily trackable, while still preserving the public verifiability of transactions. StealthPay is built on ERC-5564 (Stealth Addresses) and ERC-6538 (Stealth Meta-Address Registry), using the stealth “announcer” flow to enable users to send and receive funds on-chain via one-time stealth addresses rather than their public wallet address. For this hackathon, we shipped an MVP focused on core stealth transfers. Post-hackathon, we plan to expand with features like P2P flows, ENS-based routing (we hit an ENS resolver issue on Arbitrum during implementation, which we also want to support as a first-class feature), a message/inbox experience, and other privacy-forward UX improvements.

Tech StackReact, Node, Ethers, Web3, Solidity
Builder
Oowoeyejuju
OtherDeFi
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Builder Highlight

Most Hackathon Won

Most Project Built

Builder Highlight

Most Buildathon Won
M

Manobendra Mandal

Kolkata, India
Champion
3
No.1
V

Vivek Sahu

India
Champion
2
No.2
s

simp1e

china
Champion
2
No.3
Most Project Built
z

zorzalcripto

regencia
Champion
51
No.1
z

zcy22606

chengdu
Champion
26
No.2
D

David Barasa

Kenya
Champion
19
No.3