Lago is an open-source app for metering and usage-based billing, designed for self-hosting and scalability in businesses.

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Lago is for software companies that need to charge customers for subscriptions, product usage, or a combination of both. It collects usage events—such as API calls, AI tokens, seats, or compute—and turns them into billable metrics. Teams can set recurring, metered, prepaid-credit, and hybrid pricing, then generate invoices with subscription fees and usage charges itemized together. Lago also supports customer-specific pricing, usage and credit tracking, and integrations with payment providers and other business systems. Developers can connect an app through its API, SDKs, and webhooks. Lago is available as a managed service or as software teams can self-host.

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