Quick Start

This guide will help you bridge tokens between Casper Network and EVM chains using the AstralBeam interface at astralbeam.io.

Prerequisites

Before you start bridging, you'll need:

1. Wallets

• Casper Wallet: Install Casper Wallet browser extension
• EVM Wallet: Install MetaMask or another compatible wallet

2. Testnet Tokens

For testing on testnet, you'll need:

• Sepolia ETH - For gas fees on Ethereum
• Testnet CSPR - For gas fees on Casper
• Bridgeable tokens - USDC, WETH, LINK, etc.

See Getting Testnet Tokens for faucet links.

Bridge Flow Overview

EVM → Casper (Lock & Mint)

1. Connect both wallets
2. Select "Ethereum" as source network
3. Choose token and enter amount
4. Approve token spending
5. Confirm lock transaction
6. Wait for finality (~13 minutes on Ethereum)
7. Receive CEP-18 tokens on Casper

Casper → EVM (Burn & Unlock)

1. Connect both wallets
2. Select "Casper" as source network
3. Choose token and enter amount
4. Confirm burn transaction
5. Wait for relayer attestations (~1-2 minutes)
6. Receive ERC-20 tokens on your EVM wallet

Step-by-Step Guide

Step 1: Access the Bridge

Navigate to astralbeam.io in your browser.

Step 2: Connect Your Wallets

You'll need to connect both a Casper wallet and an EVM wallet:

1. Click the Connect button next to Casper wallet
2. Select your Casper wallet (e.g., Casper Wallet)
3. Approve the connection in your wallet
4. Click the Connect button next to Ethereum wallet
5. Select your EVM wallet (e.g., MetaMask)
6. Approve the connection in your wallet

Both wallets must be connected before you can bridge.

Step 3: Select Bridge Direction

Choose your source and destination networks:

• From: Select the source network (Ethereum, Base, etc.)
• To: Destination is automatically set to the opposite network

Click the swap arrows to reverse direction.

Step 4: Select Token and Amount

1. Click "Select token" to open the token selector
2. Choose from the available bridgeable tokens
3. Enter the amount you want to bridge
4. Your balance will be displayed below the input

Step 5: Review and Confirm

1. Click "Review Bridged Transfer"
2. Check the summary:
   • From/To networks
   • Token and amount
   • Recipient address
3. Click "Start Bridged Transfer"

Step 6: Complete Wallet Transactions

For EVM → Casper:

1. Approve the token spending (first transaction)
2. Confirm the lock transaction (second transaction)
3. Wait for Ethereum finality (~13 minutes)

For Casper → EVM:

1. Sign the burn transaction in Casper Wallet
2. Wait for relayer attestations

Step 7: Track Your Transfer

The modal will show real-time progress. You can also:

• Close the modal and track on the Transactions page
• View transaction hashes on block explorers

Transfer Times

Fees

• Source Chain Gas: You pay gas fees on the source chain
• Bridge Fee: 0.0001 ETH (paid on EVM locks)
• Destination Chain: Relayers pay destination chain gas

Next Steps

• Connecting Wallets - Detailed wallet setup guide
• Supported Tokens - Full list of bridgeable tokens
• Troubleshooting - Common issues and solutions