Vault Token

struct TokenInfo {
    uint8 decimals;      // Decimals of the underlying token
    uint256 depositFee;  // Fee in basis points (e.g., 50 = 0.5%)
    uint256 withdrawalFee; // Fee in basis points
    uint256 maxDeposit;  // Maximum allowable deposit
    bool isSupported;    // Whether the token is supported
}

function deposit(address token, uint256 amount) external {
    // 1. Verify token is supported
    // 2. Check deposit limits
    // 3. Transfer underlying token to vault
    // 4. Apply deposit fee if configured
    // 5. Mint vault tokens to user
}

function withdraw(address token, uint256 amount) external {
    // 1. Burn vault tokens from user
    // 2. Apply withdrawal fee if configured
    // 3. Transfer underlying token to user
}

function _update(address from, address to, uint256 value) internal override {
    // Consult rate limiter before any transfer
    rateLimits.update(from, to, value, totalSupply());
    super._update(from, to, value);
}

// Add support for a new underlying token
function addSupportedToken(
    address token,
    uint8 decimals,
    uint256 depositFee,
    uint256 withdrawalFee,
    uint256 maxDeposit
) external onlyOwner;

// Add liqudity for a new crosschain token
function depositAndBurn(address token, uint256 amount) external;

## Query Methods

```solidity
// Get vault reserves for all supported tokens
function getVaultReserves() external view returns (
    address[] memory tokens,
    uint256[] memory balances
);

// Get complete token configuration and balances
function getAllTokenInfo() external view returns (
    address[] memory tokens,
    TokenInfo[] memory infos,
    uint256[] memory reserves
);