SSP
Index Exchange
indexexchange.com
Index Exchange is an independent ad exchange for web, in-app and CTV inventory.
Most of the 191,711 apps that declare indexexchange.com reach it through a reseller: 99% have a RESELLER line, 29% a DIRECT one (30,388 files, 12,796 of them through outbrain.com's account). 66% of the 431,461 lines checked name an account its sellers.json (4,059 sellers) does not list. 4 sellers left its sellers.json in the last 30 days.
- Apps declaring it
- 191,711
- Sellers in sellers.json
- 4,059
- Lines verified
- 26%
- Lines with errors
- 302,403
- Avg. supply path score
- 51.8 / 100
55,967 DIRECT · 189,507 RESELLER
0% confidential
116,824 of 445,380 checked lines
445,380 lines in total
190,622 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 Index Exchange 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.
indexexchange.com, YOUR_ACCOUNT_ID, DIRECT, 50b1c356f2c5c8fc
indexexchange.com, YOUR_ACCOUNT_ID, RESELLER, 50b1c356f2c5c8fc- Field 1:
indexexchange.com, the domain Index Exchange uses in app-ads.txt. - Field 2: your account ID with Index Exchange. It must equal the
seller_idin Index Exchange'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):
50b1c356f2c5c8fc, the certification authority ID on 81% of the lines naming indexexchange.com.
sellers.json at a glance
- Status
- Published
- Sellers listed
- 4,059
- Confidential
- 0 (0%)
- Passthrough
- 0
- Removed, last 30 days
- 4
- Last read
- Oct 13, 2026
- PUBLISHER1,762
- INTERMEDIARY2,079
- BOTH218
Cross-check of lines naming indexexchange.com
- Verified 116,824
- Seller ID not found 295,554
- DIRECT but intermediary 5,285
- RESELLER but publisher 1,564
- Seller type BOTH 26,153
- Confidential seller 0
- No sellers.json 0
- Unchecked 0
Every line naming indexexchange.com is looked up in its sellers.json. What each status means
Common errors with indexexchange.com lines
-
Seller ID not found
295,554 lines
Ask Index Exchange 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
26,153 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
5,285 lines
If a partner holds this account and resells your inventory, the line should say RESELLER. If the account is yours, ask Index Exchange to list it as PUBLISHER.
-
RESELLER but publisher
1,564 lines
If the account is yours, declare it DIRECT. If a partner holds it, ask Index Exchange why the account is listed as PUBLISHER.
Intermediaries most declared as RESELLER
Accounts on indexexchange.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 |
|---|---|---|
| outbrain.com | INTERMEDIARY | 12,796 |
| unity3d.com | INTERMEDIARY | 10,877 |
| bidmachine.io | INTERMEDIARY | 10,657 |
| applovin.com | INTERMEDIARY | 10,538 |
| fyber.com | INTERMEDIARY | 8,423 |
| opera.com | BOTH | 5,958 |
| anzu.io | INTERMEDIARY | 5,194 |
Apps that declare indexexchange.com
| App | Store | Relationship | Status |
|---|---|---|---|
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT | Live | |
| Android | DIRECT + RESELLER | Live | |
| iOS | DIRECT | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| iOS | DIRECT | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | DIRECT | Live |
Questions about Index Exchange
Does Index Exchange publish a sellers.json?
Yes. Its file at https://cdn.indexexchange.com/sellers.json listed 4,059 sellers when we last read it on 13 October 2026: 1,762 publishers, 2,079 intermediaries and 218 listed as both; 0% are confidential.
How many apps declare Index Exchange in app-ads.txt?
191,711 apps in Stoqlab's data (delisted apps included) declare indexexchange.com: 55,967 with at least one DIRECT line and 189,507 with at least one RESELLER line, across 30,388 app-ads.txt files, as of 13 October 2026 (recounted daily).
What is the certification authority ID for Index Exchange?
81% of the app-ads.txt lines naming indexexchange.com carry "50b1c356f2c5c8fc" 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 indexexchange.com lines fail verification?
Of 445,380 lines naming indexexchange.com, 302,403 contradict its sellers.json. The most common case is "Seller ID not found", on 295,554 lines. Ask Index Exchange 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 indexexchange.com. Something wrong? Tell us.