Bank Precompile

The Bank precompile allows smart contracts to interact directly with the x/bank module, effectively bringing ERC-20 tokens on-chain. Any ERC-20 contract using the Bank precompile will be represented as erc20:0x... denom on-chain. Technically, this means that tokens reside only on-chain, with the EVM providing a view to the chain state rather than maintaining a separate copy. Unlike traditional bridging, where two token versions require user actions to switch, the Bank precompile offers real-time, dual-environment reflection for any transfer using either the on-chain bank denom or the ERC-20 transfer() method.

A range of ERC-20 implementations backed by the Bank precompile, alongside precompile interfaces and abstract contracts, are available at Injective’s Solidity Contracts Repository. Key contracts include:

• Bank.sol – precompile interface

• BankERC20.sol – abstract ERC20 implementation backed by the Bank precompile

• FixedSupplyBankERC20.sol – decentralized ERC20 with fixed supply (no owner, no minting or burning)

• MintBurnBankERC20.sol – ERC20 with an owner authorized to mint and burn tokens

These implementations are based on OpenZeppelin’s ERC20 contracts. Developers can freely create custom ERC20 contracts utilizing the Bank precompile.

ERC20 Contract Deployment

ℹ️ Note:

To prevent denom spam, deploying an ERC20 contract via the ERC20 module is a payable operation and requires a deployment fee of 1 INJ. Make sure your ERC20 contract deployment transaction includes this amount, or the operation will be rejected.

Bank Precompile Interface

interface IBankModule {
    function mint(address,uint256) external payable returns (bool);
    function balanceOf(address,address) external view returns (uint256);
    function burn(address,uint256) external payable returns (bool);
    function transfer(address,address,uint256) external payable returns (bool);
    function totalSupply(address) external view returns (uint256);
    function metadata(address) external view returns (string memory,string memory,uint8);
    function setMetadata(string memory,string memory,uint8) external payable returns (bool);
}

Start building

We've prepared a handful of demos that show how to build contracts using the Bank, Exchange, and Staking precompiles. These examples also demonstrate how to interact with the Injective EVM using the most common Ethereum development framework—Foundry.

See the bank precompile demo here and follow the corresponding README.