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.

online.barrons.com app-ads.txt check

online.barrons.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 9 ad networks expect (100% of 15 lines).

Checked 20 Oct 2026. 82 lines, 46 unique records, 1 duplicates, 0 invalid lines, 9 ad networks detected.

Ad networks in online.barrons.com/app-ads.txt

Amazon Publisher Services — account db1a71ee-6ccf-4011-91cd-a03118130c40: 1 line in the file
Magnite (Rubicon) — accounts 14474, 9673: 2 lines in the file
Google AdMob — account pub-4159017740785598: 1 line in the file
Index Exchange — accounts 184947, 195026: 2 lines in the file
OpenX — accounts 540158404, 543888333: 2 lines in the file
PubMatic — accounts 158676, 160162: 2 lines in the file
TripleLift — accounts 3940, 3940-EB: 2 lines in the file
Xandr (Microsoft) — account 7214: 1 line in the file
Yahoo — accounts 58796, 58966: 2 lines in the file

Corrected file: online.barrons.com app-ads.txt (fixed).

FAQ

Does online.barrons.com have an app-ads.txt?

Yes — https://online.barrons.com/app-ads.txt has 82 lines (checked 20 Oct 2026).

Which ad networks does online.barrons.com work with?

Its app-ads.txt lists Amazon Publisher Services, Magnite (Rubicon), Google AdMob, Index Exchange, OpenX, PubMatic, TripleLift, Xandr (Microsoft), Yahoo.

Is the app-ads.txt of online.barrons.com correct?