This case study details the collaboration between a Vertical Market Provider (VMP) and Semcasting's IdentityXchange (IDX) API platform to enhance digital advertising performance for real estate professionals. The VMP faced challenges with low match rates and slow activation processes when reaching potential property buyers. By leveraging the IDX platform, the VMP was able to significantly increase audience reach, achieving 2.3 times the audience scale compared to previous methods. The case study outlines how the VMP utilized the IDX platform to streamline onboarding and activation, allowing for rapid audience deployment and measurement of leads generated from advertising efforts. The integration of IDX's patented identity graph enabled the VMP to efficiently manage customer data and improve advertising effectiveness. The results illustrate the impact of this partnership on the VMP's ability to support thousands of independent realtors in local markets, ultimately enhancing their advertising strategies and lead generation capabilities.