EMS Online makes use of a REST API with a JSON body.

The API URL to be used is:


The API is only accessible using HTTPS and is secured using TLS (SSL). We support TLS 1.2 and newer. Older versions of SSL and TLS are vulnerable and not supported.


An API client must authenticate itself for every request to the API. The client can do this by using HTTP Basic Authentication. The username is the API key as generated by EMS Online, the password remains empty.

An example of an Authorization header:

Authorization: Basic aHVudGVyMjo=

The value after “Basic” can be obtained by encoding the API key (followed by a colon) using the Base64 algorithm. The API key hunter2 followed by : will result in the string aHVudGVyMjo=.

Most HTTP clients support Basic Authentication out of the box and do not require manual construction of the Authorization header.

Test api key

Test credentials can be easily obtained by creating an account. After creation you can login and view your api key under Settings > API Keys.