Three Models
Subscription: Predictable revenue, but you absorb usage variance risk. Works when usage is relatively uniform across customers.
Usage-Based: Aligns cost with revenue perfectly. But creates customer anxiety and unpredictable revenue. Works for developer tools and APIs.
Credits: Hybrid approach. Customers pre-purchase credits, reducing anxiety while keeping cost-revenue alignment. Works for most B2B SaaS.
The winning strategy for most: subscription base + usage add-on for heavy users.