BizGraph.app is a specialized 2026 AI billing software for agencies managing AI services. It automates client usage tracking, applies custom markups (percentage, flat fee, fixed), calculates profits in real-time, and generates invoices—built on enterprise LLM gateway infrastructure. Supports seamless routing to OpenAI, Anthropic Claude, Google Gemini with no code changes, unlimited clients, budget controls, alerts, and upcoming auto-invoicing + self-serve portals. Ideal for AI consultancies, software agencies, and freelancers turning one-time projects into recurring revenue streams.