Solidity Projects: 22+ Open-Source Web3 Examples

Browse 22+ open-source Solidity Web3 projects from ETHGlobal hackathons. Find production-ready code, learn from winning implementations, and discover inspiration for your next blockchain build.

Solidity is an object-oriented programming language for writing smart contracts on various blockchain platforms, most notably, Ethereum. It's used to implement smart contracts on blockchain platforms.

Token Voting

Launch custom ERC20 tokens and use them for decentralized governance on the blockchain

SolidityReactTypeScriptJavaScriptPostgreSQLNode.jsnftdaoprivacy

🏆 Celo L2 Pool Prize (Celo)

ETHGlobal Taipei • 2025

Taifei Bazaar

Taifei Bazaar: 2D DeFAI multiplayer arena inspired by Taiwanese night markets - Explore AI stalls

SolidityReactRustNext.jsNode.jsdefinftinfrastructuregamingsocial

🏆 Everyday DeFi1st place (Rootstock)🏆 Celo L2 Pool Prize (Celo)

ETHGlobal Taipei • 2025

Seedy

On-chain VDF verifier enabling trustless, tamper-resistant randomness on EVM.

SolidityTypeScriptNode.jsprivacy

🏆 Celo L2 Pool Prize (Celo)

ETHGlobal Taipei • 2025

BrickFi

Tokenizes real-world assets, enhance liquidity, platform which bridge between TradFi and DeFi.

SolidityReactTypeScriptNext.jsdefinftinfrastructuresocial

🏆 Compliance Innovation Track2nd place (HashKey Chain)🏆 Celo L2 Pool Prize (Celo)🏆 Real World Assets (Polygon)

ETHGlobal Taipei • 2025

BENS

ENS-based resolver for private, deterministic B2B wallet addresses

SolidityTypeScriptNext.jsprivacy

🏆 World Pool Prize (World)🏆 Celo L2 Pool Prize (Celo)

ETHGlobal Taipei • 2025

NameFlow

NameFlow is an AI-driven gateway for domain-based identity, seamlessly managing on-chain records.

SolidityReactRustNext.jsdefinftdaoinfrastructuregamingsocialprivacy

🏆 World Pool Prize (World)🏆 Celo L2 Pool Prize (Celo)

ETHGlobal Taipei • 2025

merhaba-wallet

merhaba-wallet boosts mass adoption of social recovery wallets with a practical, enhanced recovery mechanism.

Soliditysocialprivacy

🏆 Best dApp utilizing Account Abstraction or SocialConnect on Celo (CELO)🏆 Best use of Axiom for on - chain identity and reputation (Axiom)🏆 Most outstanding prizes using Hashi (Gnosis Chain)🏆 Deploy on Scroll (Scroll)

ETHGlobal Istanbul • 2024

ChainCart

"ChainCart" streamlines shopping via Celo mini pay or any other wallet. Scan barcodes, access product info, pay securely with blockchain, and enjoy prizes. Simplify budgeting with receipt downloads. Empowering, efficient, and accessible on mobile browsers.

SolidityReactTypeScriptJavaScriptprivacy

🏆 Pool Prize (Chiliz)🏆 Best Dapp for MiniPay2nd place (Celo)🏆 Qualifying Arbitrum Submissions (Arbitrum)🏆 Build Data Economies & Tools Together with Filecoin2nd place (Filecoin)

ETHGlobal London • 2024

GeoDash

Challenge your friends in real-time running challenge and win all amount staked in smart-contract.

SolidityReactnftgaming

🏆 Pool Prize (Chiliz)🏆 Best Dapp for MiniPay3rd place (Celo)🏆 Qualifying Arbitrum Submissions (Arbitrum)

ETHGlobal London • 2024

FlashFi

A flash loan enabled multi sig that enables DAO treasury to earn yield

Soliditynftdao

🏆 Blockscout Explorer Big Pool Prize (Blockscout)🏆 Best Open - Source Tool Built on Celo L22nd place (Celo)🏆 Best DeFi dApp on Rootstock (Rootstock)🏆 Best Omnichain Solution2nd place (LayerZero)

ETHGlobal Bangkok • 2024

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