Moesif, in collaboration with Amazon Web Services (AWS), offers a solution for implementing usage-based billing in SaaS applications through the SaaS Builder Toolkit for AWS (SBT-AWS) and the Moesif Module. This open-source toolkit simplifies the integration of billing infrastructure, allowing SaaS providers to leverage usage-based models, which align costs with actual usage and offer consumers flexibility and cost control. Despite the advantages, implementing usage-based billing can be challenging due to the complexities of real-time usage metering, accurate invoicing, and cost prediction. Moesif addresses these issues with robust metering and analytics capabilities, enabling providers to create complex billing rules and integrate with payment platforms like Stripe and Zuora. The Moesif plugin for SBT-AWS facilitates accurate event ingestion, user and tenant management, and automated invoicing, supporting various pricing models such as prepaid credits and commitment plans. The toolkit and plugin aim to streamline the development of SaaS applications by handling essential functions, freeing developers to focus on innovation while ensuring revenue generation through effective billing strategies.