Recently, Google began making the Google Guaranteed badge available to businesses for a monthly, outside of participating in Local Services Ads. The cost of the badge will set you back $50 a month, or $600 a month., and will appear on the local business profile, as well as in the Local Pack.
Currently, Google Guaranteed badges are being seen out in the wild, as stated by Joy Hakwins, who began seeing the badge appear in business profiles. But despite that, we don’t know if these badges will stick, as Google calling this program “an experiment.”
Source – Search Engine Land