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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
E

Edy Cu

Jakarta
Champion
1
No.1
c

chubbyzroxas

Champion
1
No.2
Y

Yayan Fauzi

Champion
1
No.3
Most Project Built
z

zorzalcripto

regencia
Champion
61
No.1
A

Amaan Sayyad

Navi Mumbai, India
Champion
34
No.2
A

Aaditya Rawat

Champion
29
No.3

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

Offmint

Robinhood Stock Tokens can't be minted on weekends or US holidays (about 31% of the year), but they keep trading onchain. Thin new listings spike: HIMS ran more than 300% above its Friday price on 29 Aug. Offmint is session-gated liquidity: a vault that places a four-step sell ladder above the reference price only while minting is off, and buys back after reopen with a price cap. Plus a live monitor, a weekend report of every past spike, and a personal sell order from your own wallet.

Tech StackSolidity, Next, React, Node, Web3, Foundry, Uniswap v4, viem
Builder
CCmg
DeFiRWAInfra

Bell

A stock feed's price does not say which market session produced it. Bell does: one call on Robinhood Chain mainnet returns ALLOW, WAIT or REJECT, with the reason, for any of its 35 Chainlink equity feeds

Tech StackSolidity, Python, Foundry, Chainlink, Paxos USDG, Morpho Blue, Uniswap v3
Builder
BBusiness
DeFiRWAInfra

Robotania

Robotania is an on-chain arena on Arbitrum where AI agents build, play, back and judge every match, and humans watch. Live on Arbitrum Sepolia with test USDC.

Tech StackSolidity, Python, Next, React
Builder
OOTA
AI

OpenRampKit

The RainbowKit for onramps and deposits. Open-source, unified deposit infrastructure for crypto apps: pay with a card, a bank transfer or a local QR rail, and land on Arbitrum in one step.

Tech StackSolidity, React, Next, Vue, Web3, Node
Builder
YYos Riady
InfraDeFiAI

Potluck

Rotating savings circles (hui, arisan, tanda, chit funds) as smart contracts: collateral and a winner's bond instead of trust, discount auctions, and a portable on-chain savings record.

Tech StackSolidity, Web3, React
Builder
Mmo yoyi
DeFiSocialFi

Nullfill

An escrow for Robinhood Chain that doesn't strand your money when a transaction is screened at the sequencer.

Tech StackSolidity, Node, Web3, Foundry, OpenZeppelin, Javascript
Builder
RRobert Moore
DeFiInfraRWA

Janus

Weekend cover for Robinhood Stock Tokens, paid in USDG if Monday opens lower

Tech StackSolidity, Rust, Arbitrium Stylus, Robinhood Mainnet
Builder
Kkamal
DeFiRWA

Kickoff.Cash

Proximity Markets on Robinhood built for Agents and Humans.

Tech StackWeb3, React, Next, Node, Solidity, TypeScript, MCP, PostgreSQL
Builder
NNnabugwu-ohuke Emmanuel
AIGamingOther

ReserveProof: USDG & Robinhood Stock Token Reserves

Fail-closed proof of reserves + ExitRight for USDG and Robinhood Stock Tokens. Live on Robinhood testnet and Arbitrum Sepolia; Morpho-gated oracle; 150 tests.

Tech StackReact, Next, Web3, Ethers, Node, Solidity
Builder
MMaitreya Gaikwad
DeFiInfraRWA

thebelief.fun

thebelief.fun is a prediction market for how events unfold, not only how they end.

Tech StackSolidity
Builder
MMike Claw
OtherGaming

Moment

Moment is a next-generation prediction market built on Robinhood Chain.

Tech StackSolidity, Web3, Rust
Builder
Mmarker chen
DeFi

SilentSea

Confidential perp trading on Arbitrum, with encrypted orders and hidden positions.

Tech StackReact, Web3, Node, Rust, Solidity
Builder
AAbdulla Faraz
DeFi
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