All plans have maximum requests per minute limits and daily request limits.
If you go over your plans requests per minute limit then further requests within that minute will return an error.
Daily request limits are calculated from 00:00 to 24:00 UTC. Once you reach your limit for the day any further request you send will return an error.
You can track usage (daily/weekly/monthly) within the admin area. In addition we will alert you when daily usage begins to reach the upper limit of your chosen plan;
If you are getting email alerts warning you are reaching your plan limits we suggest you upgrade your plan.