Lago

Open-source billing platform for usage-based and hybrid pricing models, built for B2B SaaS companies.

📍 France 🇫🇷, Paris

Product overview

Lago is an open-source billing platform headquartered in Paris, built for companies with usage-based, subscription, or hybrid pricing models. It provides an API-first infrastructure for ingesting usage events in real time, configuring plans with multiple pricing dimensions, and generating invoices automatically. Lago supports prepaid credits, coupons, entitlements, and progressive billing. The company was founded in 2021, graduated from Y Combinator (S21), and has raised $22 million from FirstMark, SignalFire, and Y Combinator. Its customer list includes Mistral AI, Groq, CoreWeave, and Synthesia, mostly AI and cloud infrastructure companies dealing with complex metering needs. Lago can be self-hosted for free under the AGPLv3 license or used as a managed cloud service (contact sales for pricing). The platform integrates with Stripe, Adyen, and GoCardless for payment collection and with Salesforce, NetSuite, and Xero for accounting. The company has around 30 employees, all based in Paris. The open-source repository on GitHub has over 9,200 stars. KEY FEATURES: - Event-based usage metering with real-time aggregation - Support for graduated, tiered, volume, package, and percentage pricing models - Self-hosted deployment option for full data residency control - Payment provider integrations (Stripe, Adyen, GoCardless) - Revenue analytics and SOC 2 Type II certification