Or they could be selling an app or something.... did you try googling "Web Leads 3.0"?
Off to look....
It appears there may be some kind of add-on for Google Analytics called "Web Leads 3.0" but the way this is phrased and because you got it through the FAA/Pixels mail system, gut feeling is ignore it. Just my opinion, of course.
If it's Fastbase Web Leads 3.0 it could be a legit cold email, it could be an affiliate's cold email, or it could be a spammer using Web Leads 3.0 verbiage as bait for something nefarious. You can probably get some tells by looking at the return email address and the email header.