Open House Archive

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

All Projects

By Project By Buildathon

Arbitrum YieldGuard

An intelligent AI agent that helps you manage USDC yields on Arbitrum by automatically fetching live APYs, supplying to the best protocol (Aave V3), and tracking your deposit/withdrawal history.

Tech StackPython

Builder

AIDeFi

PayGuard

PayGuard is an AI agent that lets you send one-time and recurring payments on Arbitrum using natural language.

Tech StackPython, Web3, langGraph, langChain, AppScheduler

Builder

DeFiAI

ShadowBid

Confidential Sealed-Bid Auctions

Tech StackSolidity, React, Web3

Builder

DeFiRWA

GrantOps Sentinel live privileged config scanner

Live proof pages for Arbitrum/Base contracts, showing current permission state: owner, proxy admin, implementation, pause state, and Safe config.

Tech StackReact, Next, Web3, Node, Solidity, Python

Builder

InfraAIOther

ArbiSense

Autonomous AI agent monitoring Arbitrum DeFi (DeFiLlama, Uniswap v3, Aave v3), producing a 0-100 sentiment score and recording each report immutably on-chain via a Solidity contract.

Tech StackSolidity, Web3, Python

Builder

Reign Alter World copy

X-platform Survival MMORPG w/ unique gameplay-mechanics & “inGame DeFi” (various payment methods & Yield Farm) to be “Self-Sustaining” economic, allowing players to earn through Player Supply & Demand

Tech StackWeb3, Solidity, Unity3D, Firebase, Photon, Blender, GIMP, Audacity

Builder

GameFiGamingDeFi

Kabon

AI-powered DeFi treasury copilot on Arbitrum that routes supported assets through ERC-4626 vaults and explains yield, liquidity, and withdrawal decisions.

Tech StackNext, Web3, Ethers, Solidity, thegraph, React, Arbitrum

Builder

DeFiAIRWA

Andromeda Core

Andromeda Core is a Verifiable Reputation Layer that transforms on-chain behavior into actionable TrustScores using the AVIP protocol. By utilizing Shannon Entropy for Sybil detection and asymmetric temporal decay, we provide the Arbitrum ecosystem with a tamper-proof infrastructure to audit contributor integrity and secure decentralized governance.

Tech StackReact, Next, Web3, Ethers, Python, Solidity, Rust

Builder

DAOInfraAI

ClawLens

ClawLens is building the credit score for AI agents. Today, agents can use tools and make payments, but almost every action still requires upfront capital because there is no reliable way to assess agent risk. We solve this by creating a credit score and credit file for agents based on identity, behavior, and repayment history, helping lenders and infrastructure providers decide who to trust, how much credit to extend, and at what risk. Our first use case is enabling agents to access x402 endpoints on credit and settle later.

Tech StackNode, Next

Builder

AI

ETour - Pure Competition

ETour is tournament infrastructure on the blockchain. Developers inherit this infrastructure by implementing a simple game contract. Players connect their wallets and compete. ETH-in, ETH-out. ETour handles matchmaking, brackets, timeouts, prize distribution, and more.

Tech StackEthers, React, Web3

Builder

GamingInfra

teste11 copy

teste 11

Tech StackNode, Move, depin

Builder

DeFiNFTDAO

AuctionSwipe

Swipe-first live auction marketplace on Robinhood Chain with real-time bidding, admin controls, analytics, and an auto-bid agent.

Tech StackReact, Next, Web3, Ethers, Node, Solidity, AI, Robinhood

Builder

SocialFiDeFiNFTAI

Learn

Explore Course

Build

Hack

Hack Coming Soon

Project Highlight

EduBricks

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

7th Place

Arbitrum X EDU Chain Mini-Hack

Pencil Finance

Bringing $3 Trillion in Student Loans On-Chain

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.

First Prize

Arbitrum X EDU Chain Mini-Hack

VineFinance

Vine Finance is a decentralized, modular revenue strategy protocol.

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

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.

Honorable Surprise Mention

Arbitrum Open House India: Online Buildathon

Project Highlight

EduBricks

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

7th Place

Arbitrum X EDU Chain Mini-Hack

Pencil Finance

Bringing $3 Trillion in Student Loans On-Chain

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.

First Prize

Arbitrum X EDU Chain Mini-Hack

VineFinance

Vine Finance is a decentralized, modular revenue strategy protocol.

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

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.

Honorable Surprise Mention

Arbitrum Open House India: Online Buildathon

Builder Highlight

Most Buildathon Won

M

Manobendra Mandal

Kolkata, India

3

No.1

V

Vivek Sahu

India

2

No.2

s

simp1e

china

2

No.3

Most Project Built

z

zorzalcripto

regencia

51

No.1

z

zcy22606

chengdu

26

No.2

D

David Barasa

Kenya

19

No.3

Builder Highlight

Most Hackathon Won

Most Project Built

Builder Highlight

Most Buildathon Won

M

Manobendra Mandal

Kolkata, India

3

No.1

V

Vivek Sahu

India

2

No.2

s

simp1e

china

2

No.3

Most Project Built

z

zorzalcripto

regencia

51

No.1

z

zcy22606

chengdu

26

No.2

D

David Barasa

Kenya

19

No.3

Arbitrum YieldGuard

An intelligent AI agent that helps you manage USDC yields on Arbitrum by automatically fetching live APYs, supplying to the best protocol (Aave V3), and tracking your deposit/withdrawal history.

Tech StackPython

Builder

AIDeFi

PayGuard

PayGuard is an AI agent that lets you send one-time and recurring payments on Arbitrum using natural language.

Tech StackPython, Web3, langGraph, langChain, AppScheduler

Builder

DeFiAI

ShadowBid

Confidential Sealed-Bid Auctions

Tech StackSolidity, React, Web3

Builder

DeFiRWA

GrantOps Sentinel live privileged config scanner

Live proof pages for Arbitrum/Base contracts, showing current permission state: owner, proxy admin, implementation, pause state, and Safe config.

Tech StackReact, Next, Web3, Node, Solidity, Python

Builder

InfraAIOther

ArbiSense

Autonomous AI agent monitoring Arbitrum DeFi (DeFiLlama, Uniswap v3, Aave v3), producing a 0-100 sentiment score and recording each report immutably on-chain via a Solidity contract.

Tech StackSolidity, Web3, Python

Builder

Reign Alter World copy

X-platform Survival MMORPG w/ unique gameplay-mechanics & “inGame DeFi” (various payment methods & Yield Farm) to be “Self-Sustaining” economic, allowing players to earn through Player Supply & Demand

Tech StackWeb3, Solidity, Unity3D, Firebase, Photon, Blender, GIMP, Audacity

Builder

GameFiGamingDeFi

Kabon

AI-powered DeFi treasury copilot on Arbitrum that routes supported assets through ERC-4626 vaults and explains yield, liquidity, and withdrawal decisions.

Tech StackNext, Web3, Ethers, Solidity, thegraph, React, Arbitrum

Builder

DeFiAIRWA

Andromeda Core

Andromeda Core is a Verifiable Reputation Layer that transforms on-chain behavior into actionable TrustScores using the AVIP protocol. By utilizing Shannon Entropy for Sybil detection and asymmetric temporal decay, we provide the Arbitrum ecosystem with a tamper-proof infrastructure to audit contributor integrity and secure decentralized governance.

Tech StackReact, Next, Web3, Ethers, Python, Solidity, Rust

Builder

DAOInfraAI

ClawLens

ClawLens is building the credit score for AI agents. Today, agents can use tools and make payments, but almost every action still requires upfront capital because there is no reliable way to assess agent risk. We solve this by creating a credit score and credit file for agents based on identity, behavior, and repayment history, helping lenders and infrastructure providers decide who to trust, how much credit to extend, and at what risk. Our first use case is enabling agents to access x402 endpoints on credit and settle later.

Tech StackNode, Next

Builder

AI

ETour - Pure Competition

ETour is tournament infrastructure on the blockchain. Developers inherit this infrastructure by implementing a simple game contract. Players connect their wallets and compete. ETH-in, ETH-out. ETour handles matchmaking, brackets, timeouts, prize distribution, and more.

Tech StackEthers, React, Web3

Builder

GamingInfra

teste11 copy

teste 11

Tech StackNode, Move, depin

Builder

DeFiNFTDAO

AuctionSwipe

Swipe-first live auction marketplace on Robinhood Chain with real-time bidding, admin controls, analytics, and an auto-bid agent.

Tech StackReact, Next, Web3, Ethers, Node, Solidity, AI, Robinhood

Builder

SocialFiDeFiNFTAI