Modern businesses, particularly in the SaaS and AI sectors, are increasingly transitioning from flat-rate pricing to more dynamic billing models to better align revenue with customer value and usage. This shift aims to provide transparency, flexibility, and scalability, ultimately fostering growth and reducing churn. Dynamic billing models such as usage-based, credit-based, and hybrid billing offer significant advantages by matching costs with actual usage, but they also require sophisticated billing infrastructure capable of real-time metering, automated invoicing, and scalable event tracking. Lago, a metering and usage-based monetization platform, provides comprehensive support for these advanced billing models, allowing companies to automate billing operations effectively while maintaining flexibility and transparency. The platform's API-first design facilitates seamless integration with existing product and finance systems, enabling businesses to focus on expansion without being encumbered by billing complexities.