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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

Foundersea

FounderSea is a decentralized idea funding & development platform built on Mantle

Tech StackReact, Next, Node, Python
Builder
Vvictor ezealor
DeFiDAOAIRWA

Bastion protocol

Bastion Protocol is an autonomous threat detection agent deployed on Robinhood Chain (Arbitrum Orbit L2, Chain ID 46630). It monitors the mempool in real time, scores every block using an 8-element feature vector, runs a 4-state FSM (NORMAL→ELEVATED→TRIPPED→COOLDOWN), and writes hash-committed detection proofs on-chain before exploits confirm. 5,880 scan cycles. 24/7 on Railway. 2 smart contracts deployed. 11 Alchemy components. 5 exploit patterns detected. Telegram alerts. Zero-cost gas-sponsored attestations. DeFi lost $1.8B to exploits in 2025. Flash loans, oracle manipulation, reentrancy, rug pulls, and MEV sandwiches execute in seconds. Existing tools alert after funds are gone. Bastion detects before the transaction lands.

Tech StackPython, Solidity, Web3
Builder
Oog xavier
AIInfra

OpenX

Sellers publish AI agents. Buyers hire them in one wallet signature. USDC settles on Arbitrum the same block. Optional FHE-encrypted memory carries state between iterations.

Tech StackNext, Web3, Solidity
Builder
PPham Nim
AIInfraSocialFi

OmniVerse

Dynamic LP protection instead of guaranteed wipeouts!! A Partially Active AMM with zero-liquidation lending, powered by a high-performance Rust kernel on Arbitrum Stylus.

Tech StackReact, Solidity, Rust, Viem, Ponder, Web3, Wagmi
Builder
Vvihaan jain
DeFiInfra

ROSA

ROSA digitises rotating savings circles (Sou-Sous) on-chain using Arbitrum Stylus & ZeroDev Passkeys: features gasless onboarding, multi-chain support, and smart collateral default protection.

Tech StackReact, Next, Rust, Web3, Ethers, Node
Builder
TTochukwu Nnanemelu
RWASocialFiDeFiDAO

Robinlend

A compliant, institutional-grade lending protocol deployed on Robinhood Chain L2 using tokenized real-world equities as collateral.

Tech StackEthers, Web3, React, Solidity, Node
Builder
RReginald Chinazom Olugbue
DeFiRWA

RAXCLAW-ARBITRUM

A deterministic orchestrator that scans smart contracts, simulates attacks, proves every result cryptographically, and stores immutable audit reports on-chain via Stylus on Arbitrum. No LLM override.

Tech StackNext, Ethers, Node, Solidity, Rust
Builder
KKongphop Kingpeth
AINFTInfra

NairaStable

NairaStable is a decentralized stablecoin pegged to the Nigerian Naira, built on Arbitrum. Users deposit ETH as collateral and mint nNGN. No bank, no custodian, just code.

Tech StackReact, Solidity, Node, Ethers, wagmi, Tailwind CSS, Foundry, Typescript
Builder
AAfeez Adams
DeFi

Tacet

Tacet is a sealed coordination protocol where autonomous agents commit privately, wait for a shared Drand cue, and settle deterministically on Arbitrum.

Tech StackReact, Web3, Node, Solidity, TypeScript, Arbitrum, Drand, Foundry
Builder
EEmin Karagöz
AIInfraDeFi

OmniCurve

One continuous curve instead of a hundred yes/no pools — a Gaussian-priced prediction market, with all the math running on-chain via Arbitrum Stylus.

Tech StackRust, Web3, React, Node, Solidity, Stylus, Goldsky, Websockets
Builder
TTathagat Gupta
DeFiInfraOther

Proof-of-Model

A verifiable-inference marketplace for the agent economy, on Arbitrum

Tech StackSolidity, Rust, Java, Next
Builder
EEmmanuel Akinleye
AIInfra

Coffhee Finance

Coffhee is an encrypted privacy-preserving DEX (eAMM).

Tech StackReact, Web3, Ethers, Solidity, Python, Node
Builder
LLamont Veal
DeFi
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