DynamoDB Batch Publish

I see AWS publish API for sending push notifications to devices. http://ift.tt/1jjqt1j

According to: http://ift.tt/1zzBeGd We can "Send messages directly to a specific device by calling the Publish function with the device’s ARN. You can easily scale this to handle millions of users by storing the endpoint ARNs in Amazon DynamoDB and using multi-threaded code on the server."

If I want to send push notifs to 100K users (who haven't registered to a specific topic), is there a multi-publish (or batch-publish) API, where I don't need to call the "Push notifications" API for every single user?