How Is Rotation Charged for a CMK?

After key rotation is enabled, you will be charged for storing the key. Each rotated version is calculated as an independent master key resource. The fees for API calls are irrelevant to the number of rotations.

For example, if rotation is enabled for one CMK, and the rotation period is 30 days, the unit price is $0.001388 USD ($ 0.01 USD after erasure) per hour:

First month: the rotation version of a CMK is 0, the fee is $0.72 USD (0.001 x 24 x 30 + 0 x 0.001 x 24 x 30).

Second month: the rotation version of a CMK is 1, the fee is $1.44 USD (0.001 x 24 x 30 + 1 x 0.001 x 24 x 30).

Third month: the rotation version of a CMK is 2, the fee is $2.16 USD (0.001 x 24 x 30 + 2 x 0.001 x 24 x 30).

The other egresses follow the same rule.

Month n: the rotation version of a CMK is n, the fee is 0.001 x 24 x 30 + (n-1) x 0.001 x 24 x 30 = $0.72 x n USD.