Platform Events Developer Guide
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Platform Event Limits
| Description | Performance and Unlimited Editions | Enterprise Edition | All other supported editions |
|---|---|---|---|
| Maximum number of events published per hour (Events can be published using Apex or APIs.) |
100,000 | 100,000 | 1,000 |
| Maximum event message size | 5 MB | ||
| Maximum number of events delivered to CometD clients within a 24-hour period1 | 50,000 | 25,000 | 10,000 |
| Maximum number of platform event definitions that can be created in an org | 100 | 50 | 5 |
1To request a higher number of events delivered to CometD clients, contact Salesforce to purchase an add-on license. The add-on license increases your daily limit of delivered events by 100,000 more events. For example, for Unlimited Edition, the add-on license increases the daily limit of delivered events from 50,000 to 150,000 events. You can purchase multiple add-ons to meet your event requirements for CometD clients. To avoid deployment problems and degradation in service, we recommend that the number of events delivered to CometD clients not exceed 5 million per day. If you require additional external events, contact your Salesforce representative to understand how the product can scale to meet your needs.