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.

hutch.io app-ads.txt check

hutch.io is missing out on higher CPMs: its app-ads.txt has 1 invalid line. Buyers' crawlers skip invalid lines, so those sellers can't be verified.

Checked 21 Oct 2026. 3,533 lines, 2,200 unique records, 885 duplicates, 1 invalid lines, 29 ad networks detected.

Ad networks in hutch.io/app-ads.txt

Google AdMob — account pub-6669512250654369: 1 line in the file
Liftoff Monetize (Vungle) — account 561e8d966b8d90f61a00344e: 361 lines in the file, 30 expected lines missing
Meta Audience Network — accounts 942420199124355, 238850401890201, 495920586370190: 3 lines in the file
Unity Ads — account 23546: 151 lines in the file, 10 expected lines missing
ironSource / LevelPlay — account 222729: 103 lines in the file, 23 expected lines missing
AppLovin — account 0b99f855377ff7025dd4ab57088a3e90: 36 lines in the file
HyprMX — account 24379012385: 350 lines in the file, 20 expected lines missing
Smaato — account 1100057899: 1 line in the file
Mintegral — account 31347: 400 lines in the file, 16 expected lines missing
InMobi — account cb6a6239dfec478f818c1ffca00ca440: 141 lines in the file, 131 expected lines missing
PubMatic — account 157689: 1 line in the file
DT Exchange (Fyber) — account 220848: 400 lines in the file
Chartboost — partner (reseller) lines only: 400 lines in the file, 345 expected lines missing
Yandex Ads — partner (reseller) lines only: 100 lines in the file, 68 expected lines missing
VK Ads (myTarget) — partner (reseller) lines only: 76 lines in the file, 68 expected lines missing
BIGO Ads — partner (reseller) lines only: 356 lines in the file, 400 expected lines missing
Yango Ads — partner (reseller) lines only: 400 lines in the file, 400 expected lines missing
Bidease — partner (reseller) lines only: 34 lines in the file, 15 expected lines missing
BlueSea — partner (reseller) lines only: 13 lines in the file, 24 expected lines missing
DSP Exchange — partner (reseller) lines only: 235 lines in the file, 326 expected lines missing
Maticoo (zMaticoo) — partner (reseller) lines only: 139 lines in the file, 305 expected lines missing
Monetrix — partner (reseller) lines only: 27 lines in the file, 66 expected lines missing
Prado — partner (reseller) lines only: 15 lines in the file, 12 expected lines missing
Verve (PubNative) — partner (reseller) lines only: 400 lines in the file, 400 expected lines missing
Start.io — partner (reseller) lines only: 46 lines in the file, 111 expected lines missing
Kidoz — partner (reseller) lines only: 11 lines in the file, 11 expected lines missing
CAS.ai — partner (reseller) lines only: 91 lines in the file, 74 expected lines missing
DSail — partner (reseller) lines only: 91 lines in the file, 74 expected lines missing
Bidmachine — partner (reseller) lines only: 400 lines in the file, 400 expected lines missing

Invalid lines

rubiconproject.com, 15854, RESELLER 0bfd66d529a55807

Corrected file: hutch.io app-ads.txt (fixed).

FAQ

Does hutch.io have an app-ads.txt?

Yes — https://hutch.io/app-ads.txt has 3,533 lines (checked 21 Oct 2026).

Which ad networks does hutch.io work with?

Its app-ads.txt lists Google AdMob, Liftoff Monetize (Vungle), Meta Audience Network, Unity Ads, ironSource / LevelPlay, AppLovin, HyprMX, Smaato, Mintegral, InMobi, PubMatic, DT Exchange (Fyber) and 17 more.

Is the app-ads.txt of hutch.io correct?