SSP
Magnite
rubiconproject.com
Magnite was formed in 2020 from Rubicon Project and Telaria. rubiconproject.com is the domain its display and in-app supply uses in ads.txt and app-ads.txt.
Most of the 226,124 apps that declare rubiconproject.com reach it through a reseller: 99% have a RESELLER line, 51% a DIRECT one (37,080 files, 29,876 of them through LoopMe's account). Of 2,199,334 lines checked against its sellers.json (3,226 sellers), 73% match, 19% name an unlisted account and 2.5% declare the wrong seller type. 51 sellers left its sellers.json in the last 30 days.
- Apps declaring it
- 226,124
- Sellers in sellers.json
- 3,226
- Lines verified
- 73%
- Lines with errors
- 468,531
- Avg. supply path score
- 52.7 / 100
114,897 DIRECT · 224,827 RESELLER
0% confidential
1,619,598 of 2,207,035 checked lines
2,207,035 lines in total
222,266 apps scored
App counts, the sellers.json breakdown and the directory ranking are as of , recomputed daily (the same numbers as the directory). Line counts are recounted every 10 minutes. sellers.json last read 13 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 Magnite 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.
rubiconproject.com, YOUR_ACCOUNT_ID, DIRECT, 0bfd66d529a55807
rubiconproject.com, YOUR_ACCOUNT_ID, RESELLER, 0bfd66d529a55807- Field 1:
rubiconproject.com, the domain Magnite uses in app-ads.txt. - Field 2: your account ID with Magnite. It must equal the
seller_idin Magnite'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):
0bfd66d529a55807, the certification authority ID on 97% of the lines naming rubiconproject.com.
sellers.json at a glance
- Status
- Published
- Sellers listed
- 3,226
- Confidential
- 0 (0%)
- Passthrough
- 0
- Removed, last 30 days
- 51
- Last read
- Oct 13, 2026
- PUBLISHER1,538
- INTERMEDIARY1,573
- BOTH115
Cross-check of lines naming rubiconproject.com
- Verified 1,619,598
- Seller ID not found 412,768
- DIRECT but intermediary 41,078
- RESELLER but publisher 14,685
- Seller type BOTH 118,906
- Confidential seller 0
- No sellers.json 0
- Unchecked 0
Every line naming rubiconproject.com is looked up in its sellers.json. What each status means
Common errors with rubiconproject.com lines
-
Seller ID not found
412,768 lines
Ask Magnite 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.
-
Seller type BOTH
118,906 lines
The account is listed as BOTH, so sellers.json alone cannot tell a buyer which relationship applies. Nothing to fix on your side; buyers usually look at the seller's domain.
-
DIRECT but intermediary
41,078 lines
If a partner holds this account and resells your inventory, the line should say RESELLER. If the account is yours, ask Magnite to list it as PUBLISHER.
-
RESELLER but publisher
14,685 lines
If the account is yours, declare it DIRECT. If a partner holds it, ask Magnite why the account is listed as PUBLISHER.
Intermediaries most declared as RESELLER
Accounts on rubiconproject.com 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 |
|---|---|---|
| loopme.com | INTERMEDIARY | 29,876 |
| opera.com | BOTH | 26,621 |
| algorix.co | INTERMEDIARY | 25,117 |
| start.io | INTERMEDIARY | 24,753 |
| unrulymedia.com | INTERMEDIARY | 24,600 |
| yeahmobi.com | INTERMEDIARY | 22,959 |
| bidmachine.io | INTERMEDIARY | 22,909 |
| pubnative.net | INTERMEDIARY | 22,491 |
Apps that declare rubiconproject.com
| App | Store | Relationship | Status |
|---|---|---|---|
| Android | DIRECT + RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | DIRECT + RESELLER | Live |
Questions about Magnite
Does Magnite publish a sellers.json?
Yes. Its file at https://rubiconproject.com/sellers.json listed 3,226 sellers when we last read it on 13 October 2026: 1,538 publishers, 1,573 intermediaries and 115 listed as both; 0% are confidential.
How many apps declare Magnite in app-ads.txt?
226,124 apps in Stoqlab's data (delisted apps included) declare rubiconproject.com: 114,897 with at least one DIRECT line and 224,827 with at least one RESELLER line, across 37,080 app-ads.txt files, as of 14 October 2026 (recounted daily).
What is the certification authority ID for Magnite?
97% of the app-ads.txt lines naming rubiconproject.com carry "0bfd66d529a55807" in the fourth field. The field is optional; the IAB Tech Lab ads.txt 1.1 specification says identifiers in sellers.json supersede it, so a missing or different value does not make a line invalid.
Why do rubiconproject.com lines fail verification?
Of 2,207,035 lines naming rubiconproject.com, 468,531 contradict its sellers.json. The most common case is "Seller ID not found", on 412,768 lines. Ask Magnite 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.
Not sure whether your line should say DIRECT or RESELLER? DIRECT vs RESELLER in app-ads.txt
Sources: the public app-ads.txt files of tracked apps and the sellers.json of rubiconproject.com. Something wrong? Tell us.