Auric ERC-20

src/Auric.sol — extends OpenZeppelin ERC20 + Ownable.

Constructor

constructor(address initialOwner, address _treasury)

Token Parameters

Mint

function mint(address to, uint256 amount) external onlyOwner

Owner-only. Calls _mint directly, bypassing the tax hook (mint is tax-exempt).

Burn

function burn(uint256 amount) external

Permissionless. Any holder can burn their own tokens. Calls _burn directly — burn is tax-exempt.

Transfer Tax

Non-exempt transfers are subject to a configurable tax routed to the treasury. Mint and burn operations are never taxed.

Setting the tax

function setTaxBps(uint16 newBps) external onlyOwner

Reverts with TaxTooHigh() if newBps > MAX_TAX_BPS. Emits TaxUpdated(oldBps, newBps).

Tax calculation

Implemented in _update, which overrides the OZ ERC-20 internal hook:

tax = value * taxBps / 10_000
net transfer = value - tax

Two _update calls are made: one to send tax to treasury, one to send value - tax to the intended recipient.

Tax exemptions

1. from == address(0) → mint (skipped)
2. to == address(0) → burn (skipped)
3. taxBps == 0 → no tax computed taxExempt[from] || taxExempt[to] → protocol transfer (skipped)

The owner manages exemptions with setTaxExempt(account, isExempt). The v2 deployment script exempts the vesting and AMM contracts so their exact-balance accounting remains valid even when transfer tax is enabled.

Events

Custom Errors