Ad system
oko.uk
oko.uk is the domain an ad system uses in app-ads.txt and ads.txt files. 46,810 apps in our data declare it. Its sellers.json lists 443 sellers.
- Apps declaring it
- 46,810
- Sellers in sellers.json
- 443
- Lines verified
- 45%
- Lines with errors
- 3,107
- Avg. supply path score
- 50.2 / 100
34,344 DIRECT · 41,245 RESELLER
0% confidential
6,515 of 14,448 checked lines
14,448 lines in total
47,472 apps scored
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 9 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 oko.uk 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.
oko.uk, YOUR_ACCOUNT_ID, DIRECT, b3511ffcafb23a32
oko.uk, YOUR_ACCOUNT_ID, RESELLER, b3511ffcafb23a32- Field 1:
oko.uk, the domain oko.uk uses in app-ads.txt. - Field 2: your account ID with oko.uk. It must equal the
seller_idin oko.uk'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):
b3511ffcafb23a32, the certification authority ID on 71% of the lines naming oko.uk.
sellers.json at a glance
- Status
- Published
- Sellers listed
- 443
- Confidential
- 0 (0%)
- Passthrough
- 0
- Removed, last 30 days
- 0
- Last read
- Oct 9, 2026
- PUBLISHER315
- INTERMEDIARY76
- BOTH52
Cross-check of lines naming oko.uk
- Verified 6,515
- Seller ID not found 785
- DIRECT but intermediary 1,355
- RESELLER but publisher 967
- Seller type BOTH 4,826
- Confidential seller 0
- No sellers.json 0
- Unchecked 0
Every line naming oko.uk is looked up in its sellers.json. What each status means
Common errors with oko.uk lines
-
Seller type BOTH
4,826 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
1,355 lines
If a partner holds this account and resells your inventory, the line should say RESELLER. If the account is yours, ask oko.uk to list it as PUBLISHER.
-
RESELLER but publisher
967 lines
If the account is yours, declare it DIRECT. If a partner holds it, ask oko.uk why the account is listed as PUBLISHER.
-
Seller ID not found
785 lines
Ask oko.uk 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 oko.uk 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 |
|---|---|---|
| bigo.sg | BOTH | 2,427 |
| ionvogroup.com | INTERMEDIARY | 1,984 |
| bidmachine.io | INTERMEDIARY | 1,045 |
| zmaticoo.com | INTERMEDIARY | 638 |
| iion.io | INTERMEDIARY | 500 |
| blasto.ai | INTERMEDIARY | 462 |
| boldcollective.co | INTERMEDIARY | 414 |
| videoheroes.tv | BOTH | 414 |
Apps that declare oko.uk
| App | Store | Relationship | Status |
|---|---|---|---|
| Android | RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | DIRECT | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | DIRECT | Live | |
| Android | RESELLER | Live | |
| Android | DIRECT | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live |
Questions about oko.uk
How do I add oko.uk to app-ads.txt?
Add one line for each account oko.uk gives you: "oko.uk, YOUR_ACCOUNT_ID, DIRECT, b3511ffcafb23a32". Use DIRECT when you hold the account yourself and RESELLER when a partner holds it and sells your inventory through oko.uk. The account ID must be the seller_id oko.uk lists for you in its sellers.json; oko.uk 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 oko.uk publish a sellers.json?
Yes. Its file at https://ppa.insticator.com/v1/sellers.json listed 443 sellers when we last read it on 9 October 2026: 315 publishers, 76 intermediaries and 52 listed as both; 0% are confidential.
How many apps declare oko.uk in app-ads.txt?
46,810 apps in Stoqlab's data (delisted apps included) declare oko.uk: 34,344 with at least one DIRECT line and 41,245 with at least one RESELLER line, across 4,745 app-ads.txt files. Counts are recomputed daily.
What is the certification authority ID for oko.uk?
71% of the app-ads.txt lines naming oko.uk carry "b3511ffcafb23a32" 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 oko.uk lines fail verification?
Of 14,448 lines naming oko.uk, 3,107 contradict its sellers.json. The most common case is "DIRECT but intermediary" (1,355 lines): If a partner holds this account and resells your inventory, the line should say RESELLER. If the account is yours, ask oko.uk to list it as PUBLISHER.
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 oko.uk. Something wrong? Tell us.