Propel's usage metering solution for ChatGPT-powered applications provides a scalable analytics backend, blazing-fast data API, and React component library to track usage, enforce limits, collect user feedback, and visualize insights. It enables developers to focus on building great products without worrying about the complexities of usage tracking, streamlining the development and operation of usage metering functionality. The solution supports OpenAI's ChatGPT API and plans to add support for more APIs and custom-built LLMs based on customer demand. It addresses the challenges of tracking usage by providing a powerful analytics backend, low-latency data API, and the ability to define custom metrics, query data via a GraphQL API, slice and dice on metadata, and build user-facing usage dashboards.