The article introduces five leading billing solutions tailored for Generative AI (GenAI) companies, including Togai, OneBill, Aria Systems, Metronome, and Amberflo. Each platform offers unique features and benefits, such as easy metering, flexible pricing models, user-friendly interfaces, advanced usage-based billing, and seamless integration with other systems. The right billing system is crucial for monetizing AI applications and driving revenue growth, with Togai being a particularly strong contender due to its smooth API integrations, unparalleled customization options, and extensive capabilities for usage-based billing.