Amazon Kinesis is the appropriate service for dealing with high-velocity data streams, like customer transactions in real-time. It provides the ability to process and analyze data immediately, which is essential for real-time insights and pattern detection. Amazon Athena is used for querying data stored on Amazon S3 with SQL, which is not ideal for real-time analytics. AWS Glue is a fully managed ETL service that prepares and transforms data for analytics but is not designed for real-time processing. Amazon QuickSight focuses on business intelligence and visualization and does not specialize in data ingestion or real-time analysis.