OpenMeter is an open-source usage-based billing and metering infrastructure platform that enables companies to accurately track, aggregate, and bill for AI API usage, compute resources, and feature consumption. As AI products increasingly need granular usage metering for fair pricing, OpenMeter provides the technical foundation for implementing sophisticated billing models including pay-per-token, per-API-call, tiered pricing, and consumption-based plans. It integrates with Stripe and other payment processors and provides real-time usage dashboards for both operators and customers.