From the RFC - https://discuss.dev.twitch.tv/t/rfc-0016-eventsub-websockets/32652

• When using a user access token, the developer may create up to 3 WebSocket connections per user.
• Additionally, a WebSocket connection is limited to 100 subscriptions.
• However when using a user access token, the default value of max_total_cost will be 10 rather than the default of 10,000 for an application access token.

A Websocket can subscribe to 10 cost 1 subscriptions

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Subscription ID	Topic	Condition User ID	Cost	Status