Ad system
caerulus.io
caerulus.io is the domain an ad system uses in app-ads.txt and ads.txt files. 85,370 apps in our data declare it. Its sellers.json lists 75 sellers.
- Apps declaring it
- 85,370
- Sellers in sellers.json
- 75
- Lines verified
- —
- Lines with errors
- 8,770
- Avg. supply path score
- 50.5 / 100
2,734 DIRECT · 85,340 RESELLER
0% confidential
sellers.json incomplete
32,053 lines in total
80,837 apps scored
caerulus.io's sellers.json looks incomplete: it lists 75 sellers, while app-ads.txt files name 211 other caerulus.io accounts it does not list. A line it does not list may be a seller the network never published rather than a stale line, so we show no verified or not-listed share for it.
Apps and lines are recounted every 10 minutes. The sellers.json breakdown and the directory ranking are as of , recomputed daily. sellers.json last read 10 October 2026. The supply path score sums up how short and clean the declared paths are, 0 to 100 (how it is computed).
How to add caerulus.io to app-ads.txt
One line per account, in the app-ads.txt at the root of the domain your App Store and Google Play listings name as the developer website.
caerulus.io, YOUR_ACCOUNT_ID, DIRECT
caerulus.io, YOUR_ACCOUNT_ID, RESELLER- Field 1:
caerulus.io, the domain caerulus.io uses in app-ads.txt. - Field 2: your account ID with caerulus.io. It must equal the
seller_idin caerulus.io's sellers.json. - Field 3: DIRECT if you hold the account, RESELLER if a partner holds it and sells your inventory. DIRECT vs RESELLER
- Field 4 (optional): a certification authority ID. Most lines naming caerulus.io carry none, or different ones, so we do not suggest one.
sellers.json at a glance
- Status
- Published
- Sellers listed
- 75
- Confidential
- 0 (0%)
- Passthrough
- 0
- Removed, last 30 days
- 0
- Last read
- Oct 10, 2026
- PUBLISHER44
- INTERMEDIARY31
- BOTH0
Cross-check of lines naming caerulus.io
- Verified 23,283
- Seller ID not found 8,770
- DIRECT but intermediary 0
- RESELLER but publisher 0
- Seller type BOTH 0
- Confidential seller 0
- No sellers.json 0
- Unchecked 0
Every line naming caerulus.io is looked up in its sellers.json. What each status means
Common errors with caerulus.io lines
-
Seller ID not found
8,770 lines
Ask caerulus.io for the account ID it lists for you in its sellers.json, correct the line, or remove it if you no longer work with them. Buyers that check sellers.json drop these paths.
Intermediaries most declared as RESELLER
Accounts on caerulus.io that its sellers.json lists as INTERMEDIARY or BOTH, by the number of app-ads.txt files declaring them. Confidential sellers are left out.
| Seller domain | Type | Files |
|---|---|---|
| mintegral.com | INTERMEDIARY | 7,732 |
| vungle.com | INTERMEDIARY | 4,934 |
| bidease.com | INTERMEDIARY | 4,094 |
| chartboost.com | INTERMEDIARY | 3,355 |
| zmaticoo.com | INTERMEDIARY | 863 |
| opera.com | INTERMEDIARY | 31 |
| gocarty.net | INTERMEDIARY | 3 |
Apps that declare caerulus.io
| App | Store | Relationship | Status |
|---|---|---|---|
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live |
Questions about caerulus.io
How do I add caerulus.io to app-ads.txt?
Add one line for each account caerulus.io gives you: "caerulus.io, YOUR_ACCOUNT_ID, DIRECT". Use DIRECT when you hold the account yourself and RESELLER when a partner holds it and sells your inventory through caerulus.io. The account ID must be the seller_id caerulus.io lists for you in its sellers.json; caerulus.io will give it to you. Put the file at the root of the domain named as your developer website in the App Store and Google Play listings.
Does caerulus.io publish a sellers.json?
Yes. Its file at https://caerulus.io/sellers.json listed 75 sellers when we last read it on 10 October 2026: 44 publishers, 31 intermediaries and 0 listed as both; 0% are confidential.
How many apps declare caerulus.io in app-ads.txt?
85,370 apps in Stoqlab's data (delisted apps included) declare caerulus.io: 2,734 with at least one DIRECT line and 85,340 with at least one RESELLER line, across 10,554 app-ads.txt files. Counts are recomputed daily.
Why do caerulus.io lines fail verification?
Of 32,053 lines naming caerulus.io, 8,770 contradict its sellers.json. The most common case is "Seller ID not found" (8,770 lines): Ask caerulus.io for the account ID it lists for you in its sellers.json, correct the line, or remove it if you no longer work with them. Buyers that check sellers.json drop these paths.
What is the difference between DIRECT and RESELLER?
DIRECT means the publisher owns the account; RESELLER means an intermediary sells the inventory on the publisher's behalf. DIRECT lines should match a PUBLISHER entry in the network's sellers.json, RESELLER lines an INTERMEDIARY entry.
Sources: the public app-ads.txt files of tracked apps and the sellers.json of caerulus.io. Something wrong? Tell us.