Authorized Sellers for Apps, or app-ads.txt, is an IAB Tech Lab initiative that helps ensure your app ad inventory is only sold through channels you’ve identified as authorized. Creating an app-ads.txt file gives you more control over who’s allowed to sell ads on your app and helps prevent counterfeit inventory from being presented to advertisers.
The app-ads.txt files are publicly available and crawlable by exchanges, supply-side platforms (SSP), and other buyers and third-party vendors.
Authorized Sellers for Apps (app-ads.txt) is an extension to the Authorized Digital Sellers (ads.txt) standard, originally designed for protecting web ad inventory. It extends compatibility to support ads shown in mobile apps.
Use of app-ads.txt is not mandatory, but is highly recommended, especially if you are concerned that others may be targeting your brand through misrepresented app inventory.
Learn how to set up an app-ads.txt file for your app.