-The Azure Key Vault Standard and Premium tiers are billed on a transactional basis, with an extra monthly per-key charge for premium hardware-backed keys. Azure Key Vault Managed HSM, Azure Cloud HSM, and Azure Payment HSM don't charge on a transactional basis; instead they are always-in-use devices that are billed at a fixed hourly rate. For detailed pricing information, see [Key Vault pricing](https://azure.microsoft.com/pricing/details/key-vault), [Cloud HSM pricing](https://azure.microsoft.com/en-us/pricing/details/azure-cloud-hsm/), and [Payment HSM pricing](https://azure.microsoft.com/pricing/details/payment-hsm).
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