This site did not show evidence of storing passwords in plaintext.
This site does allow secured connections (https)
This site did show a clear way to unsubscribe from their emails
This site does verify your email address.
Membership Emails
Below is a sample of the emails you can expect to receive when signed up to SERPmetrics.
You, or somebody using your email address, recently requested access to the SERPmetrics API.
Unfortunately, we do not approve trial requests from free email address providers (such as gmail.com, inbox.com or mail.ru).
If you would still like to trial our service, please sign-up again from a legitimate company email address and we will
be more than happy to approve it.