The pricing of this flexible globally distributed multi-model data store is based on Request Units (RU/s). This is a throughput charge for read, write, and query operations and has a minimum of 400 RUs. There is a secondary charge for SSD storage of data. With CosmosDB being a premium service in Azure, it can get more costly. You can also replicate globally, as you can see in the following figure:
CosmosDB global view
I have learned that missteps in using CosmosDB can be costly. One main thing I had to learn to help with this is to read the x-ms-retry-after-ms header when my RU quota was exceeded.
Like SQL, CosmosDB data collections ...
