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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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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
53
No.1
R

Rick

California
Champion
44
No.2
n

nescampos

Chile
Champion
26
No.3

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

RefusalRail

RefusalRail refuses unsafe RWA agent trades in 60 seconds and records the NO as an on-chain-ready Arbitrum Sepolia receipt.

Tech StackReact, Web3, Ethers, Node, Solidity
Builder
RRick Shao
DeFiInfraRWAAI

vault pay

VaultPay is a PayPal-style crypto savings app built on Arbitrum Stylus. It helps users create named savings vaults, add funds over time, and withdraw based on transparent maturity and penalty rules enforced by a Rust smart contract.

Tech StackReact, Node, Rust, Next
Builder
BBERNARD KARABA
DeFi

kura

KURA brings ROSCAs on-chain on Arbitrum. Communities save, coordinate capital, bid for liquidity, build reputation, and govern transparently while sensitive financial data remains confidential through

Tech StackEthers, Solidity, React, Web3
Builder
Nnoah kowa
DeFiSocialFiDAORWA

Shielded (Dapp & Private wallet extension)

Private ERC-20 payments on Arbitrum. Deposit once, pay teams without exposing who paid whom or how much, withdraw when ready. ZK proofs in-browser and onchain verifier, live on Arbitrum Sepolia.

Tech StackEthers, Solidity, Next, Web3, privacy, zero knowledge
Builder
KKehinde Akinbola
DeFiOtherInfra

INJCOPILOT

AI copilot that turns crypto intent into Injective onchain action plans with risk-aware review.

Tech StackReact, Rust, Web3
Builder
BBranham Kola
Other

Mandate

First ERC-8226 implementation: AI-managed tokenized equities on Robinhood Chain with atomic on-chain mandate enforcement, two-agent reasoning, correlation-aware risk, and examiner-ready compliance rec

Tech StackNext, Node, Solidity, Foundry
Builder
NNidhi Singh
DeFiAIRWA

LEVER

LEVER is the derivatives layer for prediction markets. It builds on top of the leading prediction markets, letting traders go long or short with leverage on any listed outcome.

Tech StackWeb3, Ethers, Solidity, React, Next, Node
Builder
JJames Park
DeFiInfraOther

Nyxora AI

Nyxora is Your Personal Web3 Assistant—a highly secure, non-custodial AI Middleware that bridges on-chain DeFi execution with off-chain OS automation. Built with a Zero-Trust 3-Tier IPC Architecture and an advanced 4-Layer Cognitive Memory, it empowers users to execute natural language smart-swaps, automate DeFi habits, and connect external agents via MCP on Arbitrum—all without ever exposing their private keys to the AI.

Tech StackReact, Node, Rust, Web3, Ethers, @napi-rs/keyring, viem, MCP
Builder
PPrasetyo Yudhanto
InfraAIDeFi

PHANTOM Protocol

Privacy-preserving prediction markets powered by Fhenix FHE on Arbitrum. Trade forecasts, automated price rounds, and multi-outcome markets while keeping market sentiment and positioning private.

Tech StackSolidity, React, Web3, Ethers
Builder
Mmr ben
DeFiAIOther

Mandate —— Safe Automation for Tokenized Assets

Mandate is a policy firewall for AI-agent finance. It keeps user funds in a smart account and lets agents act only when onchain rules approve, blocking unsafe actions before funds move.

Tech StackNext, Solidity, Web3, React
Builder
SStarry Desert
AIDeFiInfra

ArbiGame Agent

ArbiGame Agent is an AI-powered onchain game builder for Arbitrum. Describe a game idea, and the app uses Gemini to generate a structured GameSpec, Solidity game template, and playable frontend preview. The current demo includes a live solo dice game on Arbitrum Sepolia where players connect a wallet, start a round, roll dice, and claim prizes onchain.

Tech StackReact, Next, Web3, Ethers, Solidity
Builder
TTomoya Hatanaka
GamingAIInfra

FlowState

A hybrid payment protocol that solves the N+1 Signature Problem for AI agent payments. Combining x402's HTTP-native service discovery with continuous MNEE token streams on Ethereum.

Tech StackSolidity, Typescript, React, Vite, Javascript, Tailwind CSS, Gemini API, Arbitrum Ethereum
Builder
DDavid Pratama
AINFTDeFi
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