This section will explain some important REST API parameters and limits.
Maximum Rows/Contacts per Request through REST API: 1000
You can upload your data or contacts to your account through REST API. Import functions (Like Bulk Contact Import or Upsert Data to Regular Tables) supports bulk uploads. You can send up to 1000 rows of data or contacts at one request to our REST API functions.
Maximum Number of Attachments in Transactional Emails
You can include up to 5 attachments in the body of a transactional email. If needed, this limit can be increased by contacting your account manager.
Maximum Size of Each Attachment in Transactional Emails
Each of the 5 attachments can be up to 40 KB in size by default. If needed, these limits can be increased by contacting your account manager.
Requests Per Second Limit
There is a rate limit applied across all REST API endpoints. Each IP address is allowed to send up to 30 requests per second.