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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
s

songsu

Hong Kong
Champion
1
No.1
e

elpabl0.eth

Indonesia
Champion
1
No.2
c

contact ai

Champion
1
No.3
Most Project Built
z

zorzalcripto

regencia
Champion
55
No.1
R

Rick

California
Champion
44
No.2
A

Amaan Sayyad

Navi Mumbai, India
Champion
33
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

dehix copy

web3 and ai support ecosystem, one stop solution for anyone who is part of or interested in web3 and ai ecosystem

Tech StackNext, Web3, Ethers, Solidity, Node
Builder
AArpit Chauhan
DeFiNFTDAO

PayID Apps

PAY.ID: programmable payment rules for humans and AI agents. Rules as NFTs. Privacy-first transfers. On-chain enforcement. The payment layer for 0G's modular ecosystem.

Tech StackWeb3, React, Solidity
Builder
RRaihan Ardianata
OtherInfra

valen

VALEN is the governance layer for Agentic Finance, enabling AI agents to execute payments, transfers, and tokenized asset operations with mandates, budgets, compliance checks, and verifiable on-chain

Tech StackNext, React, Rust, Solidity, Ethers, Web3
Builder
Ggowe hanter
AIDeFiInfraRWA

Alpha-attest

The accountability layer for financial AI agents. Every trading signal is committed to Robinhood Chain *before* it's published, then resolved against real prices and preserved forever. No agent can quietly delete its bad calls. Verify any signal's fingerprint in your own browser. Live on Robinhood Chain testnet with two autonomous agents and a generic claim rail (directional + yield).

Tech StackNext, Web3, React, Node, Solidity
Builder
Ddamilola mustapha
AIDeFiInfra

CredFlow

CredFlow enables undercollateralized borrowing by combining multi-chain DeFi history, machine learning, optional off-chain bank verification, and a portable credit registry synchronized across chains.

Tech StackNext, Solidity, Python
Builder
SSam Felix
DeFiAI

Phantom Bounty

Phantom Bounty is a decentralized task marketplace that works as both a browser extension and web app. on-chain escrow, flash tasks (2h), reputation system, local discovery by WiFi/region,referral rew

Tech StackReact, Solidity, Web3, Node
Builder
RRaihan Ardianata
SocialFiInfraDeFi

crucible

Crucible is a trustless proving ground for DeFi agents. It forces autonomous AI to survive simulated extreme market conditions before they can trade real capital or mint on-chain attestations.

Tech StackReact, Next, Web3, Ethers, Node, Solidity
Builder
AArpit Chauhan
DeFiInfra

kickoff

KickOff 3D is a 3D browser soccer game where you stake crypto, play 1v1 matches, win KO3D tokens, and mint or trade player NFTs.

Tech StackEthers, Node, Web3, Next, React, Solidity
Builder
AAdrian Rivera
DeFiNFTGaming

OPENCAST

AI-resolved prediction markets on Arbitrum. Create markets in natural language, settle them with verifiable AI agents, and verify every decision through on-chain proofs and 0G Storage.

Tech StackReact, Next, Solidity, Web3, Ethers, Node
Builder
EEmmanuel Haankwenda
DeFiAISocialFi

Cathena

Cathena builds infrastructure for composable onchain markets. It turns uncertainty into a programmable primitive by allowing two or more outcomes to combine, form markets through liquidity, and settle transparently on-chain.

Tech StackReact, Web3, Solidity, Node, Python, Ethers, tanstack
Builder
VVijay Lakshminarayanan
AIRWA

ArcPay Arbitrum

ArcPay Arbitrum is a live treasury control plane for AI-agent businesses. It gives operators one place to manage agent identity, x402 paid work, escrowed orders, policies, USDC spend cards, privacy intents, GMX/ZeroDev/Fhenix/Dune execution evidence, and audit records on Arbitrum Sepolia.

Tech StackReact, Next, Web3, Ethers, Solidity, Node, x402, Typescript
Builder
HHenry Marfo
AIInfraDeFi

lattice

Prediction markets are powerful, but they were built for isolated outcomes. Once users start combining related events, traditional pricing breaks because it assumes every leg is independent. Lattice fixes that. Lattice is a correlation-aware structured prediction market that uses semantic analysis and Gaussian-copula mathematics to price multi-market stacks more accurately. Users can build, share, and copy structured theses, while liquidity providers earn through a protected USDC vault. Every quote is signed, risk-checked, and executed on-chain through a gas-sponsored smart account.

Tech StackReact, Rust, Solidity, Web3, Ethers, solidjs
Builder
AAbraham Anavheoba
DeFiAISocialFi
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