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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

Akan

Lagos, Nigeria.
Champion
14
No.1
S

Skia Variants

The Blockchain
Champion
13
No.2
H

Hafiidh Luqmanul Hakim

Indonesia
Champion
7
No.3

coincoin

A self-custodial onchain firewall. The instant a verifiable threat hits, it auto-evacuates your funds — at rest in your wallet AND deposited in DeFi — to a vault only you control, inside the reaction window non-atomic hacks leave open. It turns the same EIP-7702 delegation attackers use to drain wallets into your defense. Live end-to-end on Robinhood Chain testnet: full GuardianModule + RulesEngine firewall, 90 tests, real Aave V3 exit fork-verified on Arbitrum One.

Tech StackSolidity, React, Node, Foundry, TypeScript, viem, Vite, Tailwind
Builder
SSofiane Ben Taleb
InfraDeFi

MiTanda

MiTanda puts the Latin American tanda, the rotating savings and credit circle used by millions, fully onchain. Members pool USDC or MXNB, and a smart contract holds the funds and pays out fairly each round, so no organizer can disappear with the money. No seed phrases, and it is live on Arbitrum One at mitanda.online.

Tech StackNext, React, Node, Solidity, Web3
Builder
GGeorge Guadagno
SocialFiDeFiNFT

Adjudex

Adjudex — AI-judged prediction markets on Arbitrum. Bet YES/NO with USDC against other users (peer-pool parimutuel — no house), and an AI judge settles the outcome with an optimistic, on-chain verdict anyone can dispute. Markets auto-ingest from real sports, esports, and crypto feeds.

Tech StackReact, Next, Web3, Node, Solidity
Builder
DDmytro Kravchuk
DeFiAIGaming

RefusalRail

Block one unsafe RWA agent trade and save proof in 60 seconds. 1 NO receipt names wallet and hashes, then links the refusal to Arbitrum Sepolia proof at https://refusalrail.veithly.workers.dev.

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

Call It

Call It is a composable reputation layer for crypto opinions. Be right in public.

Tech StackReact, Next, Web3, Node, Solidity, Rust, wagmi, viem
Builder
DDavid Odiase
SocialFiDeFi

Megamint

Megamint is the infrastructure layer for transparent community rewards, enabling creators and projects to run verifiable fully on-chain lotteries, giveaways, and engagement campaigns.

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

Tollkit SMS

Pay-per-call SMS for AI agents. x402 V2 + AP2 mandates on Arbitrum. Buyers fund one Intent Mandate, agents send N transactional SMS off-chain, we batch-settle every 5 sends. Twilio toll-free verified, TCPA compliant. Part of tollkit.dev.

Tech StackEthers, Web3, Solidity, TypeScript, Foundry
Builder
JJoseph Henry
AIInfraOther

FaucetDrops

An automated onchain reward distribution and engagement platform. It helps Web3 projects, DAOs, and communities run token drops, campaigns, quests, and user onboarding at scale

Tech StackNext, Web3, Ethers, Python, Solidity, React
Builder
JJeremiah Oyeniran
GamingInfra

UX Hub

UX Hub — AI-Powered UX Audit Infrastructure for Arbitrum Builders

Tech StackNext, Postgres, Strapi, Viem
Builder
VValeria Caracciolo
AIOtherInfra

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

ClashFi

Competitive AI arena on Arbitrum where autonomous agents stake real tokens to prove intellectual superiority.

Tech StackNext, Node, Solidity, React
Builder
AAndreas Setyo
DeFiGamingAIInfra
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