How to Add App-ads.txt to Your Website

What is App-Ads.txt ?

Ads.txt, or Authorized Digital Sellers, is an initiative by the IAB Technology Laboratory (Interactive Advertising Bureau) designed to increase transparency and prevent online ad fraud in programmatic advertising. 

The app-ads.txt file can be used by app publishers to show which ad networks and sources have been authorized to sell their inventory. App publishers can do this by adding the app-ads.txt file to their website, and linking their app store listing to their website. DSPs can check the app-ads.txt listings on app publishers’ sites, and only support bids from authorized sources specified in the app-ads.txt file.

How to Implement App-Ads.Txt: Step by Step

1. Link your app store listing to your website

Include the URL of your developer website in your app store listing. Advertising networks will use the address to verify the app-ads.txt file.

2. Contact all relevant ad sources

Request the app-ads.txt lines from your advertising networks. According to the IAB, the structure follows this outline:

Ad source domain:

For StartApp, this value is startapp.com.

Publisher ID:

This is StartApp's unique ID for each developer website of a publisher. It can be found in the app-ads.txt interface in the portal.        

Type of account/relationship: 

The app-ads.txt file should only include providers who work directly with you, or third-party resellers who have a relationship with your direct partner. If the partner is direct, it needs to be listed as DIRECT. For third party resellers, it should be listed as RESELLER.

Certification authority ID:

This is the ad source TAG ID. For StartApp, leave this empty.

3. Create the App-Ads.txt file

  • Go to App-ads.txt interface in the portal via two optional locations:

Analytics Dashboard:

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App-ads.txt tab on the left menu:

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  • Click the Generate app-ads.txt Entries button, and your developer website ID will be added automatically. 

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  • You can either copy the list or download the txt file.
  • If you have more than one developer website, you will be required to generate the necessary app-ads.txt entries separately for each one of your developer websites. In this case, you will have the option to select the developer domain first:

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4. Publish and upload your app-ads.txt file

Create an app-ads.txt file using any text editor you choose (for example, Notepad) and include all the lines you received from your ad providers. Upload it to your domain website.

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