Movable Ink is a service that allows regular emails to contain live, updating information from the web. Email marketing can be more dynamic, but the service can also be used for any type of email where live information is useful.
The Movable Ink API, which is only available on paid plans, allows developers to programmatically add new content to live emails, as well as access statistics about emails and the content within them.
The API is RESTful and returns JSON. A plan paying $49 per month or more is required for API access.