Yes, there is a daily limit on the number of unique users to whom the broadcast message can be sent. There is no limit to the number of messages sent but on the number of unique users. Also, it does not apply to the messages sent in response to a user-initiated message within a 24-hour window. There are basically three Tiers.
Tier 1: Allow businesses to send broadcast messages to 1000 unique users on a daily basis (in 24 hour slot)Tier 2: Allow businesses to send broadcast messages to 10,000 unique users on a daily basis (in 24 hour slot) Tier 3: Allow businesses to send broadcast messages to 100,000 unique users on a daily basis (in 24 hour slot)
The messages sent to users over the limit goes into Enqueued section of the campaign which will automatically be sent after the 24 hour. For example, if a business is in Tier 1 category and sends a broadcast to 1500 unique users. In this case, the broadcast will be sent to only 1000 users and rest 500 will receive the message after 24 hours.
The only way to increase the WhatsApp Broadcast Limit is by getting promoted to the next Tier. This can be done only if:
1. The quality rating is not low.
2. The cumulative amount of unique users the business sends notifications to adds up to twice its current messaging limit within a 7-day period.
See the charts below to understand how a business moves to the next Tier.
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