Is there a limit to the number of escalations (Google Phishing Protection and Block) a client can perform based on the price model for Iris Detect?

For blocking, there is no limit. The Block action simply flags the domain as Blocked so it shows up as such in API calls . For Google Phishing Protection, the UI limits you to 10 domains at a time, but you can repeat this process as many times as you wish from the UI’s perspective.