It's 80 messages per second. So 4800 messages per 1 minute. Which is: 288,000 messages per hour. Few things you need to know: Promptchat use the Cloud API hosted by Facebook. (Not the On Premise WABA API which can potentially output more messages per second) Companies wanting to send large campaigns can simply give 3 days advance notice to Facebook engineers who can allocate the required throughput for sending 100s of thousands of messages. See here: https://developers.facebook.com/docs/whatsapp/cloud-api/overview/

How Many WhatsApp messages can we send via FB WABA Cloud API

So 4800 messages per 1 minute. Which is: 288,000 messages per hour.

Few things you need to know:

Promptchat use the Cloud API hosted by Facebook. (Not the On Premise WABA API which can potentially output more messages per second)
Companies wanting to send large campaigns can simply give 3 days advance notice to Facebook engineers who can allocate the required throughput for sending 100s of thousands of messages. See here: https://developers.facebook.com/docs/whatsapp/cloud-api/overview/

admin Is there any guidance on how to integrate with Facebook Messenger. I have only seen the one for WhatsApp. What about messenger?