Lago
Open-source metering and usage-based billing API
10.4k stars 728 forks last commit first released AGPL-3.0
Actively maintained
Last commit 26 Aug 2026.
Lago is an open-source billing infrastructure platform focused on event-based usage metering and hybrid pricing (subscriptions plus consumption). It provides an API-first approach with a visual interface to help teams model pricing, track usage, and generate invoices.
Key Features
- Event-based usage metering and ingestion for consumption tracking
- Support for subscription, usage-based, and hybrid pricing models
- Plan and pricing configuration, including pricing iterations
- Invoicing with automatic charge calculation based on configured plans
- Coupons, add-ons (one-time charges), and prepaid credits
- Billing data visibility and revenue analytics to support finance and operations workflows
Use Cases
- Building product-led SaaS billing with usage-based components
- Centralizing billing logic while integrating with existing payment and business systems
- Processing high-volume billing events to generate accurate invoices
Lago is well-suited for organizations that want a programmable billing system with transparent billing logic and extensible integrations, while keeping billing data under their control.
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