About Bear Lumen
We build the financial infrastructure for the AI era.
Bear Lumen was founded to solve a critical engineering bottleneck: the complete lack of real-time visibility into LLM cost architectures and customer-level profit margins.
Zero latency overhead0 bytes of prompt data storedBuilt with SOC 2 standards in mind
The Backstory
Born out of production frustration.
As software engineers building AI-native products, we learned a painful lesson early on: traditional SaaS unit economics do not work for AI.
One morning we woke up to a massive, unexpected OpenAI bill. A handful of power users had deployed recursive autonomous agents that ran thousands of complex tokens in loops. On paper, our Stripe subscription revenue looked great. In reality, our profit margins were bleeding in real time.
We looked for a tool that could instantly map API token costs against real customer revenue and track unit economics by feature. Nothing existed. So we built Bear Lumen, and it has been founder-led ever since.
Our Mission
Empowering builders to create sustainable AI businesses.
Three principles guide every product decision we make, from how we ingest a single token event to how we surface margin data in your dashboard.
Transparency first
Product teams should never have to wait for an end-of-month cloud invoice to learn a feature is losing money. Real-time margin visibility is not a premium add-on, it is the baseline.
Developer-centric
Financial tooling should feel like good software. The SDK deploys in minutes with minimal configuration and zero performance overhead on your core API response times.
Data minimization
Security is non-negotiable. We track operational metadata and billing events, never your prompt contents, completions, or private customer data.
Engineering Standards
Built for mission-critical production infrastructure.
Infrastructure monitoring cannot introduce latency or points of failure into your product. Bear Lumen is built from the ground up to handle high-throughput event ingestion with zero impact on your core API response times.
Asynchronous by design
Cost events are queued and processed entirely out of band. There is zero blocking on your API path, no matter how high the throughput.
Ephemeral credentials
Tokenized API handshakes with rotating auth and zero long-lived credentials. Every handshake is ephemeral.
Strict data privacy
Built with SOC 2 standards in mind. Prompt contents and PII never enter our ingestion layer, by architecture rather than by policy.
SDK intercept →Async queue →Cost engine →Attribution →Dashboard
Your request returns to your user first. Cost attribution happens after, on our infrastructure, adding nothing to your response times.
Ready to stop guessing your AI margins?
Bear Lumen gives founders and engineers the real-time margin visibility to build profitable AI products.
No credit card required. Free tier included. Set up in minutes.