"What Is Your Home Worth" website functionality?

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I keep seeing agents who have a link to a "Find Out What Your Home Is Worth" section. When you put in your address it gives you a valuation of your home and more importantly if captures their email for later re-marketing. It basically is designed to add value while also bringing in elads.

My question though is "Where is everyone going to get this"? What company offers this service, the only one I found is guaranteedsale and they only allow 1 agent per region to use their service and my region is already claimed.