You can configure your proxies to only be accessed from certain IP addresses whether using username/password (API key) authentication or IP whitelisting. This will give you extra security in the unlikely event that your username or API key is ever compromised.

To add to your "Allowed IPs", navigate to the Authentication page in your dashboard. From there, find the input box below "Allowed IPs", as you see in the screenshot below:

Input each IP address you would like to allow to use your proxies, with a new line separating each IP address. After you have inserted the IP addresses needed, click "Save".

If you would like your proxies to be accessible from any IP address, simply leave this area blank.