A million events per second: How Lago scales usage-based billing with ClickHouse Cloud

Lago, a French startup, utilizes ClickHouse Cloud to efficiently manage large-scale, real-time usage-based billing for complex enterprises by scaling its event ingestion from 10,000 to 1 million events per second. Originally, Lago's founders discovered the intricacies of billing systems while working at fintech company Qonto, realizing the importance of transparent, open-source systems that avoid the limitations of proprietary billing solutions. ClickHouse Cloud was chosen for its ability to handle high ingestion rates, fast analytical queries, and activity logs without requiring extensive configuration or maintenance efforts. This infrastructure supports Lago's goal of providing flexible billing solutions for businesses of varying complexity, including those with AI-driven and API-first models, by allowing accurate, low-latency billing and real-time usage insights. As Lago expands its customer base to larger enterprises, ClickHouse continues to be integral, enabling scalable and reliable performance as Lago aims to consolidate its data management around a single high-performance system.

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