Hi Pramod Tunikipati •,
Thanks for your question.
Azure Cosmos DB bills for NoSQL database operations, consumed storage and optional dedicated gateways, across all selected Azure regions enabled on your Azure Cosmos DB account.
The cost of all database operations is normalized and expressed as either request units (RU) or vCore (compute and memory). Azure Cosmos DB offers three database operations models:
Configuring your Azure Cosmos DB databases and containers with the right amount of provisioned throughput, or Request Units (RU/s), for your workload is essential to optimizing cost and performance.
To control the cost you may need to adjust the RUs.
Here is the pricing calculator and explained how the cost getting calculated
Here is document on how to Plan and manage costs for Azure Cosmos DB
Please let us know if you have any further questions or need additional information.