With Amazon EventBridge, you pay for events published to your event bus and events ingested for Schema Discovery. There are no additional charges for rules or event delivery. There are no minimum fees or upfront commitments. All state change events published by AWS services are free.
Size of Payloads: Each 64 KB chunk of a payload is billed as 1 event (for example, an event with a 256 KB payload is billed as 4 events).
Usage of the Schema Registry for AWS and custom schemas is free.
The Schema Discovery feature of the Schema Registry includes a free tier of 5 million ingested events per month. In most development use cases, where you use discovery in your development environment, your usage should stay within the free tier.
For additional usage outside of the free tier, for example if you wanted to use Schema Discovery to audit all events passing through your production event bus, is charged at:
Size of Payloads: Each 8 KB chunk of a Schema Discovery payload is billed as 1 ingested event (for example, an event with a 16 KB payload is billed as 2 ingested events).
The EventBridge Schema Registry is available in the following regions: US East (Ohio and N. Virginia), US West (Oregon and N. California), Canada (Central), EU (Stockholm, Paris, Ireland, Frankfurt, and London), Asia Pacific (Mumbai, Tokyo, Seoul, Singapore, Hong Kong, and Sydney), and South America (Sao Paulo).
If a SaaS application published 5 million events in one month, your charges would be calculated as follows:
The monthly price is $1 per 1 million events.
Monthly events = 5M events (all equal to or less than 64 KB each)
Monthly events charges = 5M * $1.00/M = $5.00 per month
If your development environment published 2 million events in a month, each averaging 2KB; and you enabled Schema Discovery on your development event bus, your charges would be calculated as follows:
Monthly events = 2M events * $1.00/M = $2.00 per month.
Schema Registry = Free.
Schema Discovery = 2M events. No additional discovery costs (5M events included in free tier).
Total Monthly EventBridge charges = $2.00 (event publishing) + $0 (Schema Registry) + $0 Schema Discovery = $2.00 per month.