# Constants

[Git Source](https://github.com/traderjoe-xyz/joe-v2/blob/16f011d25e6bf6d0a0c479974345b623d491104f/src/libraries/Constants.sol)

**Author:**\
Trader Joe

Set of constants for Liquidity Book contracts

## State Variables

### SCALE\_OFFSET

```solidity
uint8 internal constant SCALE_OFFSET = 128;
```

### SCALE

```solidity
uint256 internal constant SCALE = 1 << SCALE_OFFSET;
```

### PRECISION

```solidity
uint256 internal constant PRECISION = 1e18;
```

### SQUARED\_PRECISION

```solidity
uint256 internal constant SQUARED_PRECISION = PRECISION * PRECISION;
```

### MAX\_FEE

```solidity
uint256 internal constant MAX_FEE = 0.1e18;
```

### MAX\_PROTOCOL\_SHARE

```solidity
uint256 internal constant MAX_PROTOCOL_SHARE = 2_500;
```

### BASIS\_POINT\_MAX

```solidity
uint256 internal constant BASIS_POINT_MAX = 10_000;
```

### MAX\_LIQUIDITY\_PER\_BIN

```solidity
uint256 internal constant MAX_LIQUIDITY_PER_BIN =
    65251743116719673010965625540244653191619923014385985379600384103134737;
```

### CALLBACK\_SUCCESS

*The expected return after a successful flash loan*

```solidity
bytes32 internal constant CALLBACK_SUCCESS = keccak256("LBPair.onFlashLoan");
```