All use of the Cloud Resource Manager API and Cloud Asset API are free of charge. However, using tags with other Google Cloud services could be subject to charges.

Using tags with Cloud Storage is subject to the following charges:

• Attaching and detaching tags from a bucket is charged as a Class A operation.
• Listing tags attached to a bucket is charged as a Class B operation.
• Each tag attached to a bucket is charged at $0.005 per month.

• Read the Resource Manager documentation.
• Get started with Resource Manager.
• Learn about Resource Manager solutions and use cases.