API Authenticate 
For some API features you’ll need to authenticate. You can do this with an Api-Key-header where the key starts with sa_api_key_....
In your account settings you can create this key.
To test if your API key works correctly you can replace the example values of this cURL example with your own:
curl "https://simpleanalytics.com/example.com.json?version=5&fields=histogram" \
-H 'Content-Type: application/json' \
-H 'Api-Key: sa_api_key_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
For some API calls you’ll need a user ID:
curl "https://simpleanalytics.com/api/websites" \
-H 'Content-Type: application/json' \
-H 'Api-Key: sa_api_key_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' \
-H 'User-Id: sa_user_id_00000000-0000-0000-0000-000000000000'
Your user ID is shown in your account settings.
If you have any problems, drop us a line via our contact page.