CCTP Sample App

This sample application demonstrates Cross-Chain Transfer Protocol (CCTP) step-by-step capabilities on testnet networks. The app showcases CCTP functionality across multiple testnets:

• Arc Testnet
• Ethereum Sepolia
• Avalanche Fuji C-Chain
• Base Sepolia
• Linea Sepolia
• Arbitrum Sepolia
• Sonic Testnet
• Worldchain Sepolia
• Optimism Sepolia
• Solana Devnet
• Codex Testnet
• Unichain Sepolia
• Polygon PoS Amoy
• Sei Testnet
• XDC Testnet
• Plume Sepolia
• HyperEVM Testnet
• Ink Sepolia
• Monad Testnet

Environment Setup

1. Copy the .env.example file to .env.local:

   cp .env.example .env.local

2. Update the .env.local file with your configuration:

   • EVM Private Key: Add your EVM private key (32-byte hex string, with or without 0x prefix) to NEXT_PUBLIC_EVM_PRIVATE_KEY
   • Solana Private Key: Add your Solana private key (Base58 encoded string) to NEXT_PUBLIC_SOLANA_PRIVATE_KEY

   The application will automatically use the appropriate private key based on the source/destination chain:

   • EVM chains: Uses NEXT_PUBLIC_EVM_PRIVATE_KEY
   • Solana chains: Uses NEXT_PUBLIC_SOLANA_PRIVATE_KEY

   Note: For backward compatibility, NEXT_PUBLIC_PRIVATE_KEY is still supported for EVM chains if NEXT_PUBLIC_EVM_PRIVATE_KEY is not set.

Getting Started

1. Clone this repository:

   git clone https://github.com/circlefin/circle-cctp-crosschain-transfer.git

2. Install dependencies.

   npm install

3. Run the development server.

   npm run dev

The sample app will be running at http://localhost:3000.