Chargebee is a billing platform for subscription and usage-based businesses that handles pricing, billing, collection, and revenue recognition in one system.

Billing automation - Recurring billing, invoicing, and payments for tiered, flat-fee, usage-based, and hybrid plans.
Quotes and approvals - Multi-year, multi-product quotes with approval workflows and selling rules.
Entitlements - Enforces pricing and usage limits for features, agents, and products.
Payments coverage - Connects to dozens of gateways with routing, retries, and fraud screening.
Revenue recognition - Recognizes revenue across usage and multi-year contracts with ramps.
AI-assisted analysis - Asks billing, churn, and collections questions from chat tools through a billing MCP.

It is used by SaaS and AI companies that outgrow simple invoicing and need usage billing, quotes, and revenue reporting without building it in-house.