MediaMath and PubMatic join forces to expand media buying ecosystem in Asia Details 18 February 2021 MediaMath has tied up with PubMatic to make the latter's ad supply in Asia available to MediaMath buyers. This is done through MediaMath's omnichannel media buying platform SOURCE, which will see PubMatic bringing added display, mobile, and connected TV inventory from a roster of publishers across Southeast Asia including LINE, KLY, Detik.com, Kompas Gramedia, ABS-CBN, and Sanook. Launched in 2019, SOURCE is MediaMath's digital media ecosystem that aims to be transparent with advertisers and help them optimise their media-buying strategies. According to PubMatic, publishers have been asking for increased transparency, and brands and media buyers want better insights into the inventory they are acquiring.