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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

x

Arbitrum X EDU Chain Mini-Hack

Pencil Finance

Bringing $3 Trillion in Student Loans On-Chain

Champion

x

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

x

Arbitrum X EDU Chain Mini-Hack

VineFinance

Vine Finance is a decentralized, modular revenue strategy protocol.

Champion

x

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

x

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

x

Arbitrum Open House India: Online Buildathon

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
A

Aaditya Rawat

Champion
29
No.1
S

Skia Variants

The Blockchain
Champion
14
No.2
A

Akan

Lagos, Nigeria.
Champion
14
No.3

GrantOS

GrantOS is the first onchain grant protocol that enforces milestone delivery with cryptographic proofs not trust, not screenshots, not committee opinion. The contract verifies. The code runs.

Tech StackNext, Web3, Ethers, Node, Solidity, Nestjs, Noir
Builder
YYusrah Mohammed
DAOAIInfraOther

Himaya Agent: Security Shield for Arbitrum Retail

"A frictionless, AI-driven security agent on WhatsApp/Telegram that provides real-time transaction risk analysis and dApp auditing for the Arbitrum ecosystem."

Tech StackWeb3, Move, Solidity, Node
Builder
MMuthahid Sabeel
DeFiAI

Rentline Sandbox

Rentline Sandbox is an onchain real estate environment on Robinhood Chain. For investors, it is a turn-based simulation where you trade fractional property tokens with macro-driven real estate finance products like mortgages and liens. For developers, it is an RWA toolkit for token design, recurring cash flows, and fiat to stablecoin servicing conversion.

Tech StackWeb3, Python, Solidity, Ethers, Node, Next, React
Builder
BBrandyn Hamilton
RWAInfraAI

AI Agent Blockchain Execution Platform

One API that gives any AI agent the ability to simulate, execute, and track on-chain actions autonomously

Tech StackRust, Solidity, Html, Web3
Builder
AArdent Research
AIInfraDeFi

HashFit

HashFit is a sportswear brand taking the Web3 cultural layer beyond DeFi, proof that physical consumer brands can be built natively on-chain from day one.

Tech StackReact, Ethers, Solidity, Typescript
Builder
IIbrahim Oladotun
NFTOtherInfra

txKit

Open protocol and reference SDK for Ethereum transaction safety. Decode calldata, simulate, preview before sign. ERC-8265 (Prepared Transaction Envelope) reference implementation.

Tech StackReact, Web3, Node, Solidity, Next
Builder
MMike Diamond
AIInfraRWA

AI & Powers Protocol

AI-powered tools and agents for the Powers Protocol: making it easy to create on-chain governed organisations and keep them adaptive through AI-assisted deliberation and reform.

Tech StackReact, Next, Web3, Solidity, Node
Builder
TTeije Hidde Donker
DAOAI

AgentAudit AI

On-chain AI compliance infrastructure for autonomous AI agents. Immutable audit trails, ZK-proof verification, and automated EU AI Act reporting (Articles 9-15, 50, 53, 72) deployed on Arbitrum One and 4 other EVM mainnets. 169/169 tests passing. EU AI Act enforcement deadline August 2026.

Tech StackWeb3, Ethers, Node, Solidity, TypeScript, Foundry
Builder
EEwelina Guzik-Czenszak
AIInfra

Eliezer Suite

Eliezer Suite is an AI freight logistics platform on Arbitrum that reduces payment risk and fraud using confidential escrow, on-chain compliance, and digital Bills of Lading for secure trade.

Tech StackNext, Web3, Solidity, Rust
Builder
LLucky Nweke
DeFiRWAAIInfra

Palpitada

Palpitada is live on Arbitrum since Dec/25 with a dual-engine prediction market — LMSR for cold-start liquidity + on-chain CLOB for liquid markets. Nobody else combines both. Add gasless EIP-712 transactions, native USDC settlement, $1 minimum bets, and a mobile-first PWA, and you get prediction markets that actually work on a phone — for everyone, everywhere. We're an Arbitrum Foundation grant recipient ($49k, Nethermind audit in progress). Beta in production, organic users, real volume. The hard tech is shipped: smart contracts, subgraph, EIP-712 gasless transactions, embedded wallets with social login, USDC settlement, PIX rails in Brazil — all built solo, all live on Arbitrum mainnet. Buildathon = scale what's already shipped.

Tech StackReact, Web3, Solidity, Node, The Graph, Next
Builder
VVinicius Santiago Tenente
GamingDeFiSocialFi

Bivium

Bivium turns your wallet into its own lending venue. You set the rate, you pick the collateral, and people borrow from you not from an anonymous pool. Built on EIP-7702, every wallet is a resting limit order. When risk shows up, it stays with the lender who signed it.

Tech StackReact, Next, Web3, Ethers, Solidity, Tailwind
Builder
AAlvaro Teran
DeFi

Atoma Vault

Delta-neutral vault capturing perp funding spreads on Nado and Extended. Exchange points distributed weekly to depositors. ~31% APY on USDC. https://atoma.fi/

Tech StackSolidity, Ethers, Python, Vue, Web3
Builder
AAnton Kazintsou
RWAOtherDeFi
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