With the Send API you can send emails to to individual email addresses (or existing contact IDs). These emails will be immediately queued and sent by Envoke.
One of the primary uses cases is to send transactional emails.
You can provide new or existing email addresses in your API call, new emails provided will automatically be created as contacts in your database.
The API supports fully custom HTML, or using the content of a pre-existing message or template in your Envoke account (by providing the "template_id" field in your request).
NOTE: if you need to send emails to a predefined list in your database (a tag, subscription, or segment) you should use the Messages API instead.
The send API supports batches of up to 1,000. Sending to lists larger than 1,000 is supported with multiple batched API calls to a single message ID.
See further articles with more details and examples: