billing for apps and services


Write pricing plans like collections of functions.
Manage subscriptions and accounts with a powerful transactional API.
Get account balances at any point in time.


Start Billing. Free!

Functional source based billing

Write billing plans as collections of functions. Test easily. Manage changes in Git.


Declarative transactional API

All information in KillingBilling is the result of atomic application of billing plan functions to the incoming transaction and existing data.

Dedicated API endpoints

Deploy collections of your billing plans to dedicated endpoints in the cloud with full runtime code and database isolation (from other projects).


Accurate balance at any time

Submit transactions related to any point in time and get accurately calculated balances for any point in time.

More features coming

  • push notifications rules
  • end user account information widgets
  • reports
  • more programming languages