Azure Cosmos DB Cassandra API is a fully managed cloud service that is compatible with Cassandra Query Language (CQL) v3.11 API. It has no operational overhead, and you can benefit from all the underlying Azure Cosmos DB capabilities such as global distribution, automatic scale-out partitioning, availability and latency guarantees, encryption at rest, backups, etc.
At the time of writing this blog, the Azure Cosmos DB Cassandra API serverless is available in preview mode!