Is there a limit on the number of notifications I can receive from the Watching Service?

At up to 1000 notifications per day for Telegram and 500 notifications, a day for email, the notification limit for the Watching Service is so high that you won’t notice it for individual use. We can guarantee that. 

If you would like to monitor hundreds, or even thousands of addresses simultaneously, we suggest you have a look at our Bulk API Monitor.