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.

x-flow.app app-ads.txt check

x-flow.app is missing out on higher CPMs: its app-ads.txt has 13 invalid lines. Buyers' crawlers skip invalid lines, so those sellers can't be verified.

Checked 20 Oct 2026. 11,839 lines, 8,105 unique records, 3,547 duplicates, 13 invalid lines, 42 ad networks detected.

Ad networks in x-flow.app/app-ads.txt

Google AdMob — accounts pub-6821112058762467, pub-2749054827332983, pub-4236520483129668 and 2 more: 5 lines in the file
Amazon Publisher Services — accounts ed0dd5c8-afea-497f-8771-939f8ce2b392, 822c7bc2-d58f-4911-b8a2-95ee49e044c8, 71d4b8ca-53d1-4309-a952-3306259fb046: 3 lines in the file
TripleLift — accounts 11333, 6998, 10389 and 5 more: 8 lines in the file
OpenX — accounts 540781812, 563905670, 557323449 and 10 more: 13 lines in the file
Xandr (Microsoft) — accounts 11006, 7351, 14416 and 4 more: 7 lines in the file
PubMatic — accounts 158722, 157113, 95054 and 10 more: 13 lines in the file
Magnite (Rubicon) — accounts 18020, 21656, 11784 and 9 more: 12 lines in the file
InMobi — accounts dd6702462852443b87e066a10aad571e, 4f52e4780ffb42ce91ba64345e6cbea5, ddb41d8a9f434a918d05a0fc9999d9f9 and 3 more: 222 lines in the file, 55 expected lines missing
Index Exchange — accounts 194165, 186112, 199442 and 1 more: 4 lines in the file
Verve (PubNative) — accounts 1007514, 1009397, 1008230 and 5 more: 400 lines in the file, 159 expected lines missing
Smaato — accounts 1100057802, 1100057803, 1100045559 and 4 more: 7 lines in the file
AppLovin — account 4fe0e44c6618c16025817e7382ab649d: 36 lines in the file
Ogury — accounts 8565d9901044d90e546724031a350a61, c848a3041be5a218b5372da8d11ea3e7, c4c762508bfa300f8baa57fde6a723d7: 19 lines in the file, 1 expected line missing
Liftoff Monetize (Vungle) — account 5b1526a7de961d3317b1d475: 391 lines in the file
DT Exchange (Fyber) — account 208665: 400 lines in the file
Unity Ads — account 1351375: 150 lines in the file, 11 expected lines missing
ironSource / LevelPlay — account 214687: 112 lines in the file, 14 expected lines missing
HyprMX — account 22067407443: 309 lines in the file, 61 expected lines missing
Yandex Ads — accounts 77043577, 305143219, 105069416: 154 lines in the file, 17 expected lines missing
BlueSea — account 204037: 25 lines in the file, 13 expected lines missing
Sovrn — accounts 594162, 543917, 544061 and 13 more: 16 lines in the file
Start.io — accounts 179510621, 160174750, 182962838 and 1 more: 130 lines in the file, 31 expected lines missing
Bidmachine — accounts 201, 358: 400 lines in the file, 113 expected lines missing
Maticoo (zMaticoo) — accounts 5135063, 114490, 37782 and 1 more: 400 lines in the file, 17 expected lines missing
Chartboost — account 5cc1a2c8197f3f0abe722fba: 400 lines in the file, 20 expected lines missing
Mintegral — account 20830: 400 lines in the file, 21 expected lines missing
CAS.ai — accounts 922e6092, b5a73ae1, babe9c54: 144 lines in the file, 21 expected lines missing
Criteo — accounts B-057702, B-061291: 2 lines in the file
TikTok Ad Network (Pangle) — accounts 9236, 5006878: 2 lines in the file
BIGO Ads — accounts 363, 23166530: 400 lines in the file, 15 expected lines missing
Yahoo — account 60013: 1 line in the file
MobileFuse — account 3192: 1 line in the file
Monetrix — account 148: 73 lines in the file, 21 expected lines missing
VK Ads (myTarget) — partner (reseller) lines only: 124 lines in the file, 20 expected lines missing
Yango Ads — partner (reseller) lines only: 400 lines in the file, 400 expected lines missing
Bidease — partner (reseller) lines only: 39 lines in the file, 10 expected lines missing
Display.io — partner (reseller) lines only: 13 lines in the file, 19 expected lines missing
DSP Exchange — partner (reseller) lines only: 400 lines in the file, 153 expected lines missing
Madex — partner (reseller) lines only: 9 lines in the file, 9 expected lines missing
Prado — partner (reseller) lines only: 19 lines in the file, 8 expected lines missing
Kidoz — partner (reseller) lines only: 15 lines in the file, 7 expected lines missing
DSail — partner (reseller) lines only: 144 lines in the file, 21 expected lines missing

Invalid lines

smaato.com,-,DIRECT,07bcf65f187117b4
keenkale, 94044, RESELLER, 6c1c00b269ccdfa4
rubiconproject.com, 15854, RESELLER 0bfd66d529a55807
smartadserver.com, <4199>-OB, RESELLER, 060d053dcf45cbf3
smartadserver.com, <4199>, RESELLER, 060d053dcf45cbf3
lemmatechnologies, 1844, RESELLER
singularads, 895023, RESELLER
beapup, 658874, RESELLER
singularads, 548745, RESELLER
admanmedia.com, XXX, RESELLER
kodigital,KO100009, DIRECT
b42d42eb28400efa, targetbetter.com, 6451, RESELLER
lumeriq, 111326 RESELLER

Corrected file: x-flow.app app-ads.txt (fixed).

FAQ

Does x-flow.app have an app-ads.txt?

Yes — https://x-flow.app/app-ads.txt has 11,839 lines (checked 20 Oct 2026).

Which ad networks does x-flow.app work with?

Its app-ads.txt lists Google AdMob, Amazon Publisher Services, TripleLift, OpenX, Xandr (Microsoft), PubMatic, Magnite (Rubicon), InMobi, Index Exchange, Verve (PubNative), Smaato, AppLovin and 30 more.

Is the app-ads.txt of x-flow.app correct?