Cross-chain

Key Features

• Cross-chain Swaps & Bridges

  • Seamless token swaps between Solana and EVM chains
  • Bridge functionality for moving assets across chains
  • Quote system for cost estimation
  • Support for both native and wrapped tokens

• Token Operations

  • ERC20 approval management for cross-chain bridges
  • Token allowance verification
  • Automatic address resolution based on chain type

Main Tools

The module exposes several key tools for cross-chain operations:

#![allow(unused)]
fn main() {
get_multichain_quote()  // Get cost estimate for cross-chain swaps
multichain_swap()       // Execute cross-chain token swaps/bridges
check_approval()        // Verify ERC20 token approvals
approve_token()         // Approve ERC20 tokens for bridge contracts
}

Configuration

The module requires an Ethereum RPC URL which can be set via the ETHEREUM_RPC_URL environment variable. It supports multiple EVM-compatible chains through provider configuration.

Important Notes

1. Token Decimals: Amount parameters must account for token decimals:

   • USDC: 6 decimals (1 USDC = 1000000)
   • SOL: 9 decimals (1 SOL = 1000000000)
   • ETH: 18 decimals (1 ETH = 1000000000000000000)

2. Gas Requirements: Users must have native tokens (SOL/ETH) on both chains to cover gas fees, unless using sponsored transactions (coming soon).

3. Token Identification: Tokens can be specified using:

   • Symbol (e.g., "USDC")
   • Solana public key
   • EVM contract address

4. Chain Support: Currently running Solana and Arbitrum, EVM is not fully multi-tenant, need some tweaks. Full coverage on the way