Lago

Lago is an AI-native, open-source billing platform founded in 2021 and headquartered in Paris, France, with a presence in San Francisco.

The platform is designed for SaaS, AI, cloud, and fintech companies, enabling them to manage complex, usage-based, and subscription-based pricing models with transparency and flexibility. Lago offers a developer-first, event-based billing API that serves as a flexible alternative to proprietary solutions. The platform includes features such as usage metering, subscription management, flexible pricing iterations, customer portals, payment orchestration, and revenue analytics. It is available as both a cloud-hosted SaaS and a self-hosted open-source version, allowing businesses to customize their billing logic to fit their monetization strategies. Lago serves B2B product-led SaaS companies, including notable clients like Mistral AI and Groq, helping them scale revenue operations while maintaining control over their billing processes.