ZetaDocs

The Universal Token standard enables ERC-20 fungible tokens to be minted on any chain and seamlessly transferred between connected chains.

When transferring tokens between chains, a token is burned on the source chain. The token's amount is sent in a message to the token contract on the destination chain, where a corresponding token is minted.

The Universal Token standard works the same way as Universal NFT.

contracts/Connected.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.26;
 
import "@zetachain/standard-contracts/nft/contracts/evm/UniversalNFT.sol";
 
contract Connected is UniversalToken {
    constructor(
        address payable gatewayAddress,
        address owner,
        string memory name,
        string memory symbol,
        uint256 gasLimit
    )
        UniversalToken(gatewayAddress, gasLimit)
        Ownable(owner)
        ERC20(name, symbol)
    {}
}

contracts/Universal.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.26;
 
import "@zetachain/standard-contracts/nft/contracts/zetachain/UniversalNFT.sol";
 
contract Universal is UniversalToken {
    constructor(
        address payable gatewayAddress,
        address owner,
        string memory name,
        string memory symbol,
        uint256 gasLimit,
        address uniswapRouter
    )
        UniversalToken(gatewayAddress, gasLimit, uniswapRouter)
        Ownable(owner)
        ERC20(name, symbol)
    {}
}