To lower costs, start by batching API calls to minimize the frequency of requests. For example, instead of sending one event per API call, group multiple events into a single request. Reduce redundant tracking by ensuring only necessary events are captured, avoiding duplicates, and eliminating excessive data points. Leverage cloud-based solutions like Google Cloud Functions or AWS Lambda, which provide on-demand scalability. These services only charge for compute time used, making them cost-effective for handling variable traffic. Additionally, implement caching mechanisms for frequently accessed data to reduce server load and API costs further.