We raised $22 million to build an open-source alternative to traditional payments & billing platforms

Lago announced a $22 million funding round led by FirstMark, with participation from Y Combinator, New Wave, Script, and industry figures from MongoDB, Stripe/OpenAI, and Hugging Face, while FirstMark partner Matt Turck joins its board. Founded after a difficult post–Y Combinator pivot, the company identified billing as a major engineering problem through a widely read Hacker News post and has since built an open-source billing platform with more than 5,000 GitHub stars and customers including Mistral AI and Swan. Lago positions itself as more than an open-source alternative to Stripe Billing or Chargebee, emphasizing flexibility, composability, customer control of billing data, and developer-focused support for complex monetization models. Its roadmap includes expanding access to real-time billing data through integrations with payment, tax, quoting, reporting, and other revenue systems; adding organizational controls and analytics; and eventually fostering shared tools and community collaboration for pricing, forecasting, revenue recognition, margins, and industry-specific financial models.

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