SNS

These stay near zero until there is traffic, and are the hardest to predict from source alone.

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  SNS

  aws_sns_topic

  Per million publishes plus per delivery, which varies by protocol.

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  SNS

  aws_sns_topic_subscription

  Per notification delivered, at a rate that depends on the protocol. SMS is far above the rest.

These carry no charge of their own, though some of them govern resources that do.

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  SNS

  aws_sns_topic_data_protection_policy

  A setting on another resource rather than a resource that bills. Whatever it governs is where the charge lands.

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  SNS

  aws_sns_topic_policy