# Detect metrics export pricing
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When you publish cloud-side, device-side, or custom metrics to an MQTT topic that you configure, you will not incur charges for this step of the export process. However, in the subsequent steps when you transfer the published metrics to a destination of your choice, by using Rules Engine or Messaging, you will incur costs based on the transfer method you choose. Amazon IoT Device Defender publishes batched metrics to MQTT topics as a single message that contains metrics data for multiple devices, which helps control costs. For more information regarding pricing, see the [Amazon Pricing Calculator.](https://calculator.aws/#/addService)