API PubSub Limits

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The limits for Extension PubSub are mentioned here: Building Extensions | Twitch Developers

Broadcasting via PubSub

When the EBS wants to transmit real-time messages or state via PubSub, it will use the Send Extension PubSub Message endpoint. Using this endpoint, your EBS can broadcast to all viewers of a given channel or to specific users via a whisper.

Adhere to these limits for Twitch PubSub traffic:

• 1 message per second per channel
• 5 KB message size

These rules ensure the stability and scalability of our systems.