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

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

AIInfraSocialFi

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

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

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

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

AIInfraDeFi

Proof-of-Model

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

Tech StackSolidity, Rust, Java, Next

Builder

AIInfra

Coffhee Finance

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

Tech StackReact, Web3, Ethers, Solidity, Python, Node

Builder

DeFi

Blank

Private payments for public blockchains. Blank keeps transaction amounts encrypted using FHE while preserving on-chain auditability through invoices, escrow, payroll, and agent payments.

Tech StackReact, Solidity, Web3, Ethers, Fhenix CoFHE

Builder

DeFiInfraRWAAI

Arbitrum Agent Kit

The first MCP-compatible autonomous AI agent framework on Arbitrum. On-chain safety enforced by AgentWallet.sol. Deployed on Arbitrum Sepolia + Robinhood Chain.

Tech StackNext, Web3, Ethers, Solidity, React

Builder

DeFiAI

ArbiProof

Onchain proof on Arbitrum that an AI agent stayed within the authority it was granted.

Tech StackReact, Web3, Node, Solidity

Builder

DeFiInfraAI

Tychi AI

Tychi: terminal wallet for humans, MCP wallet for agents — keys local, Arbitrum onchain.

Tech StackNode, MCP, Ethers, TypeScript, Web3

Builder

AIInfra

Morbit

Non-custodial lending infrastructure for tokenized real-world assets, built on Robinhood Chain Testnet and Arbitrum.

Tech StackReact, Ethers, Solidity, Web3, Next

Builder

DeFiRWAInfra

Learn

Explore Course

Build

Hack

Hack Coming Soon

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

54

No.1

R

Rick

California

44

No.2

n

nescampos

Chile

26

No.3

Builder Highlight

Most Hackathon Won

Most Project Built

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

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

54

No.1

R

Rick

California

44

No.2

n

nescampos

Chile

26

No.3

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

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

AIInfraSocialFi

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

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

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

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

AIInfraDeFi

Proof-of-Model

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

Tech StackSolidity, Rust, Java, Next

Builder

AIInfra

Coffhee Finance

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

Tech StackReact, Web3, Ethers, Solidity, Python, Node

Builder

DeFi

Blank

Private payments for public blockchains. Blank keeps transaction amounts encrypted using FHE while preserving on-chain auditability through invoices, escrow, payroll, and agent payments.

Tech StackReact, Solidity, Web3, Ethers, Fhenix CoFHE

Builder

DeFiInfraRWAAI

Arbitrum Agent Kit

The first MCP-compatible autonomous AI agent framework on Arbitrum. On-chain safety enforced by AgentWallet.sol. Deployed on Arbitrum Sepolia + Robinhood Chain.

Tech StackNext, Web3, Ethers, Solidity, React

Builder

DeFiAI