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Cross-Chain Token Bridge

This project implements a cross-chain token bridge between Arbitrum Sepolia and Optimism Sepolia testnets using Gelato's Web3 Functions, Relay service and 1balance.

Overview

This bridge allows users to transfer tokens between Arbitrum Sepolia and Optimism Sepolia testnets. It consists of:

  1. Smart Contracts: MockERC20 tokens deployed on both networks.
  2. Web3 Function: A Gelato Web3 Function that listens for burn events and mints tokens on the destination chain.
  3. Frontend: A React application that provides a user interface for the bridge.

Features

  • Burn tokens on the source chain
  • Automatically mint tokens on the destination chain
  • Support for bridging between Arbitrum Sepolia and Optimism Sepolia
  • User-friendly interface for initiating bridge transactions

Prerequisites

  • Node.js and npm
  • MetaMask or another Web3 wallet
  • Test ETH on Arbitrum Sepolia and Optimism Sepolia

Installation

Clone the repository:

git clone https://github.com/dianalokada/gelato-bridge

Install dependencies:

npm install

Contracts Quick Start

Compile the contrac

npx hardhat compile

Deploy the contracts on arbitrumSepolia and optimismSepolia

npx hardhat run scripts/deploy.ts --network arbitrumSepolia
npx hardhat run scripts/deploy.ts --network optimismSepolia

Create a .env file in the root directory and add your contract addresses and privite key

CONTRACT_ADDRESS_ARBITRUM_SEPOLIA=0x...
CONTRACT_ADDRESS_OPTIMISM_SEPOLIA=0x....
PRIVATE_KEY=...

Smart Contracts block explorers

Frontend Quick Start

From the project root, navigate to the frontend folder:

cd frontend

Install project dependencies

npm install

Run the frontend

npm run dev

Update contract addresses in the App.tsx

Replace MY_ARBITRUM_CONTRACT_ADDRESS and MY_OPTIMISM_CONTRACT_ADDRESS with the actual deployed contract addresses.

Configure MetaMask

  • Add Arbitrum Sepolia and Optimism Sepolia networks to MetaMask.
  • Fund your MetaMask account with testnet tokens for both networks.

Open your browser and navigate to http://localhost:5173

Connect your Web3 wallet (ensure you're on either Arbitrum Sepolia or Optimism Sepolia network)

  • First, use the "Mint Test Tokens" button to mint ERC20 tokens for testing
  • After, enter the amount you want to bridge and click "Bridge Tokens"

Web3 Function

The Web3 Function code is located in web3Function/bridge/index.ts. It listens for TokensBurned events on both networks and mints corresponding tokens on the destination chain.

Interact with the UI

  • Connect MetaMask to your app.
  • Switch between Arbitrum Sepolia and Optimism Sepolia in MetaMask to test bridging from both directions.

Test the bridge

  • Mint tokens before bridging
  • Input an amount to bridge
  • Select the source chain
  • Click "Bridge Tokens"
  • Approve the transaction in MetaMask
gelato.bridge.mov

Verify the result

  • Check that tokens were burned on the source chain
  • Switch to the destination chain in MetaMask
  • Verify that tokens were minted on the destination chain