Yext services over 500,000 businesses with their local listings service. They offer automated listings management on a partner network of 50+ partner sites. Additional features including review monitoring, social posting and duplicate suppression are available on upgrade.
The base service costs $500/year for all sites on their publisher network with their highest plan costing $999/year. Listings created on Yext get deleted upon cancellation and many online reviews report problems with the Yext service.