Letter Fair
by Štěpán Fiala · cz.stepanfiala.letterfair
Most of the 174 lines in Letter Fair's app-ads.txt (stepanfiala.cz) are RESELLER lines: 170 against 4 DIRECT, across 60 ad systems. 132 of 172 lines checked against sellers.json match; 16 name a seller ID the network does not list, 6 declare the wrong seller type. The file last changed on 6 October 2026; the same file covers 2 apps of this developer.
Store data
- Rating
- 4.17
- Installs
- 50,000+
- Category
- Puzzle
- Contains ads
- Yes
113 ratings
Offers in-app purchases
app-ads.txt
- Domain
- stepanfiala.cz
- Status
- Found (200)
- Lines
- 174
- DIRECT / RESELLER
- 4 / 170
- OWNERDOMAIN
- stepanfiala.cz
- Parse errors
- 5
- Last fetched
- Oct 13, 2026
- Last changed
- Oct 6, 2026
sellers.json cross-check
174 lines checked
Verified
132
Errors
22
Warnings
19
- Seller ID not found 16
- RESELLER but publisher 6
- Seller type BOTH 17
- Confidential seller 1
- No sellers.json 1
- Unchecked 1
Declared supply tree
4 direct accounts across 4 direct sellers · 130 resellers buying from them · 40 not matched
| Direct seller | Accounts | Resold by | Issues |
|---|---|---|---|
| applovin.com | 1 | 57 resellers: rubiconproject.com, pubmatic.com, sharethrough.com … | 0 |
| unity.com | 1 | 57 resellers: pubmatic.com, sharethrough.com, rubiconproject.com … | 1 |
| facebook.com | 1 | — | 0 |
| google.com | 1 | — | 0 |
40 resellers, intermediary not matched to a direct seller of this app (the ad system publishes no usable sellers.json: 1; account not found in the ad system's sellers.json: 15; the intermediary's domain is not a direct seller of this app: 18; sellers.json lists the account as a publisher, not an intermediary: 6).
Seller IDs the networks do not list
16 lines of this app-ads.txt name an account ID that the ad system's sellers.json does not contain; the first 15 in file order. Usually a stale line or a typo in the ID. How to fix it
| Line | Ad system | Account ID | Relationship |
|---|---|---|---|
| 19 | outbrain.com | 0073fa86cff719c752763d2c3ee52c8f00 | RESELLER |
| 53 | smartadserver.com | 5828-OB | RESELLER |
| 69 | criteo.com | b-062019 | RESELLER |
| 77 | appnexus.com | 6849 | RESELLER |
| 80 | appnexus.com | 17234 | RESELLER |
| 81 | appnexus.com | 15980 | RESELLER |
| 88 | media.net | 8cu355vs4 | RESELLER |
| 96 | sharethrough.com | 5828-OB | RESELLER |
| 124 | rubiconproject.com | 25064 | RESELLER |
| 157 | unity.com | 1826017 | DIRECT |
| 161 | inmobi.com | 23d316d3d980453d8ea0dcf9caec4078 | RESELLER |
| 167 | app-stock.com | 256917 | RESELLER |
| 171 | taurusx.com | 70079 | RESELLER |
| 176 | google.com | pub-2923085774557613 | RESELLER |
| 177 | google.com | pub-3990748024667386 | RESELLER |
New to these files? What is app-ads.txt · Network directory · Glossary
Last crawled Tue, Oct 6, 2026 7:37 PM. Data derived from the public store listing, the developer's app-ads.txt and the ad systems' sellers.json files.