Add/Remove Liquidity

1. Get Reserve

• You could fetch reserve by querying getReserves function on the pool directly. See here to know how to get pool address. This getReserve function is the only function you'll directly interact with the pool. For all other functions, including add/remove liquidity, you should call them through the vault (Router) contract.

function getReserves() public view returns (uint256, uint256, uint256) {
        return (
            _getPoolBalance(token0).toInt256(),
            _getPoolBalance(token1).toInt256(),
            block.timestamp
        );
    }    

2. Add Liquidity

function quoteAddLiquidity(
        address tokenA,
        address tokenB,
        bool stable,
        uint256 amountADesired,
        uint256 amountBDesired
    ) external view returns (uint256 amountA, uint256 amountB, uint256 liquidity);
    
function addLiquidity(
        address tokenA,
        address tokenB,
        bool stable,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB, uint256 liquidity);

 function addLiquidityETH(
        address token,
        bool stable,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);

3. Remove Liquidity

function quoteRemoveLiquidity(address tokenA, address tokenB, bool stable, uint256 liquidity)
        external
        view
        returns (uint256 amountA, uint256 amountB)
function removeLiquidity(
        address tokenA,
        address tokenB,
        bool stable,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) public returns (uint256 amountA, uint256 amountB);
function removeLiquidityETH(
        address token,
        bool stable,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) public returns (uint256 amountToken, uint256 amountETH);