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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
M

Manjeet Sharma

india
Champion
16
No.1
R

Rick

California
Champion
16
No.2
D

DHRUV PANCHOLI

jaipur
Champion
15
No.3

Blackrocq - Private DeFi in Arbitrum

Privacy DeFi powered by FHE. Swap, transfer, earn yield with fully encrypted balances. Prove compliance cross-chain without revealing amounts. Your trades are invisible, your credit travels

Tech StackNext, Web3, Node, Solidity, React, FHE, LayerZero
Builder
MManish
DeFiInfraOther

Orlance

Arbitrum's Fixed Income infrastructure for tradable yield tokens, powered by automated rolling vaults and risk-free lotteries.

Tech StackNext, React, Web3, Solidity, AMM
Builder
FFerdinand

TrainChain

TrainChain is a decentralized ticketing platform that transforms train travel through blockchain technology. By minting tickets as NFTs on Arbitrum, TrainChain eliminates counterfeiting, enables secur

Tech StackWeb3, Ethers, Node, Java, Solidity, React, Next
Builder
MModiti Rabalao
NFT

Cadence

Subscription infrastructure built on Arbitrum that enables autonomous recurring payments in USDC.

Tech StackReact, Ethers, Node, Solidity
Builder
MMuhammed Musa
DeFiInfra

vacuum

Arbitrum-native execution layer and superapp: swap (Uniswap V3), ERC-4626 vaults, strategy NFTs, DAO automation, non-custodial agents, and an optional private RPC with MEV protection. Fully permission

Tech StackWeb3, Ethers, Solidity, Next, Compact, React, Go
Builder
HHarsh Sharma
InfraDeFiRWADAO

ArbShield

Privacy-Preserving Compliance Verification Engine for Institutional Real-World Assets (RWAs) on Arbitrum

Tech StackStylus, Next, Web3, Ethers, Node, Solidity, React, Rust
Builder
AAaditya Rawat
RWADeFiInfra

Tozlow

This is Tozlow: a simple, elegant app that turns casual plans into real commitments (penalizes friends who flake on agreed-upon meetups with USDC). Built for groups, powered by blockchain, designed for humans.

Tech StackNext, Rust, Stylus, Wagmi
Builder
Aarroz
DAOSocialFiInfra

robinbulk

bulksent for robin testnet

Tech StackWeb3, Node, Solidity, Python
Builder
Ggeneral general
DeFiOtherInfra

compose.market

compose.market is a drag&drop builder to launch monetized, composable agents & workflows with infinite memory - powered by payable APIs (x402), globally reachable by humans & agents alike.

Tech StackSolidity, React, IPFS, MongoDB, Thirdweb, Mem0, Temporal, Hugging Face
Builder
AAlex
AIDeFi

Cryptoun

Turn USDC into PDF coupons anyone can redeem onchain — powered by Arbitrum

Tech StackNext, Web3, Ethers, Solidity, circle dev wallet, Circle CCTP
Builder
SSai Ram
DeFiSocialFi

Minimax

Multi-DEX LP Battle Arena on Arbitrum where liquidity providers compete head-to-head in time-bound PvP matches.

Tech StackReact, Web3, Ethers, Solidity
Builder
CCapinho
DeFiGamingAI

TransPaY

Making cross-chain payments as simple as Web2 payments.

Tech StackSolidity, Ethers, Web3, Next
Builder
CCipher Hex
DeFiInfra
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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

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