We have an event-based architecture and offer 'aggregations' at the moment: https://doc.getlago.com/docs/guide/billable-metrics/aggregat... We plan to add more aggregation types, gauge metering as well!

We definitely want to address usage-based pricings, but also all the pricings that are hybrid between usage and subscriptions (ie the vast majority of software pricings). Feel free to reach out if you have more question: anhtho@getlago.com