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app-ads.txt is a plain-text file published at the root of a publisher’s developer site. It lists the companies authorized to sell that publisher’s ad inventory. Most advertisers check this file before bidding; a seller that isn’t listed is assumed to be fraudulent and skipped. For Kontext to bring you demand, your app-ads.txt needs to list our authorization line. Adding it is a one-time setup and a hard requirement for ramping up fill rate.

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Where the file lives

The file is hosted at the root of your developer marketing site: the domain linked from your App Store or Google Play listing as the developer URL. That is the domain advertisers check, so the file must live at https://yourmarketingsite.com/app-ads.txt. If you already host the file for other ad partners, append our line; don’t replace the file.

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The line you add

We send you the exact line during onboarding. It follows the standard IAB format:
Once added, nothing else is needed on your side. Advertisers pick up the change the next time they crawl your file, typically within 24 hours.

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Later updates

When we add a selling partner or change our seller domain, we send you a new line. Append it (and keep the old one until we say otherwise); the change propagates the same way. Unsure what your file contains, or whether our line is already there? Send the URL to support@kontext.so and we’ll check.