Pricing Calculations

The Catalyst Pricing page contains the latest pricing calculations of each action in a feature or component in every Catalyst service.

Depending on the operation in a specific component, the unit of pricing will vary. For most components, the pricing calculations mentioned in the Pricing Page are self-explanatory.

For example, the unit of pricing for Circuits in Serverless is amount/state transition, which indicates that each transition occurring in every circuit is billed at the specified price. Similarly, the unit of pricing for operations such as a File Store Download, Data Store Insertion, or Cache Get is amount/request, which indicates that each request or API call made will be billed at the specified price. Components such Mail, Push Notifications, or Search are priced in the units of amount/email sent, amount/notifications sent, amount/query executed respectively.

The units of pricing for Serverless Functions and AppSail are GB-Second and GB-Hour respectively, which are not as straightforward as the other units. Let’s discuss these units with an example. Consider the pricing for these units as given below.

Functions

Unit: Executions Per Second

AppSail

Unit: Instances Per Hour

The table indicates that the cost of a function’s execution varies based on the function’s configured memory size. For example, a 128 MB function’s execution will incur a cost of $0.000002 per second. A single unit of this is considered as 1 GB-Second. That is, USD 0.000002 worth of usage per second for a function execution is 1 GB-Second, for a function of memory size 128 MB.

If the free tier allowance hard limits provided for function executions is 25000 GB-Seconds, for instance, it means that we provide 25000 x 0.000002 for a function of 128 MB, which is equal to USD 0.05 worth of executions for free.

This is similarly calculated for each memory size of a function. For example, if a function is of 512 MB in memory, then the 25000 GB-Seconds that are provided in the free tier would indicate that 25000 x 0.000008 i.e., USD 0.2 worth of usage is free.

This principle is the same for the unit of GB-Hour assigned to AppSail executions. The only difference being, the executions are timed on a per hour basis instead of a per second basis, as done for functions. Therefore, 1 unit of GB-Hour is USD 0.02 worth of usage per hour for an AppSail service instance of 256 MB in size.