An IAB Tech Lab standard that lets app publishers declare which ad networks are authorized to sell their inventory.

Where do I put the app-ads.txt file?

At the root of the developer website listed in your App Store / Google Play page, e.g. https://studio.com/app-ads.txt.

What is a Certification Authority ID?

An optional TAG-ID of the ad system, the 4th field of an app-ads.txt record.

atmfeesaver.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 3 ad networks expect (100% of 5 lines).

Checked 23 Oct 2026. 68 lines, 53 unique records, 6 duplicates, 0 invalid lines, 7 ad networks detected.

Google AdMob — accounts pub-1136881862179489, pub-7631346527830681, pub-6855116426669376: 3 lines in the file
Magnite (Rubicon) — account 22884: 1 line in the file
OpenX — account 560438876: 1 line in the file
Mintegral — partner (reseller) lines only: 12 lines in the file, 400 expected lines missing
Chartboost — partner (reseller) lines only: 15 lines in the file, 400 expected lines missing
BIGO Ads — partner (reseller) lines only: 13 lines in the file, 400 expected lines missing
Yango Ads — partner (reseller) lines only: 20 lines in the file, 400 expected lines missing

Yes — https://atmfeesaver.com/app-ads.txt has 68 lines (checked 23 Oct 2026).

Its app-ads.txt lists Google AdMob, Magnite (Rubicon), OpenX, Mintegral, Chartboost, BIGO Ads, Yango Ads.

atmfeesaver.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 3 ad networks expect (100% of 5 lines).