> Each app-ads.txt line names an account at an ad system. If that account isn't in the ad system's public sellers.json, buyers who validate the supply chain can't match the line to a seller.

Source: https://appsupplyindex.com/fix/seller-id-not-in-sellers-json · Updated: 2026-10-07 · License: CC BY 4.0 (App Supply Index)

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[Learn](https://appsupplyindex.com/learn/) · How to fix

# Why isn't my seller ID found in the ad system's sellers.json?

Updated Oct 7, 2026 · data from 12 App Store genres · top free + top grossing charts · US · iOS + Android

**Short answer:** Each app-ads.txt line names an account at an ad system. If that account isn't in the ad system's public sellers.json, buyers who validate the supply chain can't match the line to a seller.

**639 of 883**
ad-monetized top US apps in this index have this finding (72%)

## Why it matters

Buyers that check sellers.json may ignore lines they can't match, which can reduce demand for that path.

Common causes are closed accounts, former partners whose lines were never removed, typos in the ID, or an ad system whose sellers.json lists only part of its accounts.

## How to fix it

1. Check the ID character by character against what the partner gave you.
2. Ask the partner whether the account is still active and request their current lines.
3. Remove lines for accounts that were closed or partners you no longer work with.

## Apps with this finding

Each report lists the exact lines involved.

- [Word Search Explorer®](https://appsupplyindex.com/app/ios-1602508478) · PlaySimple Games Pte Ltd
- [Meowdoku!](https://appsupplyindex.com/app/ios-6761760135) · OAKEVER GAMES PTE. LTD.
- [Vita Mahjong](https://appsupplyindex.com/app/ios-6468921495) · VITA STUDIO PTE. LTD.
- [Amaze GO!](https://appsupplyindex.com/app/ios-6758326278) · OAKEVER GAMES PTE. LTD.
- [Colorever: Gem Art Puzzle](https://appsupplyindex.com/app/ios-6761757565) · OAKEVER GAMES PTE. LTD.
- [Mystery Town: Merge Games](https://appsupplyindex.com/app/ios-6503603603) · Cedar Co., Limited
- [Jigsawcard Solitaire Puzzle](https://appsupplyindex.com/app/ios-6754900673) · OAKEVER GAMES PTE. LTD.
- [Sled Surfers](https://appsupplyindex.com/app/ios-6744975195) · CRAZY LABS BY TABTALE , G.P.
- [Glow Fashion Idol](https://appsupplyindex.com/app/ios-6446197181) · CRAZY LABS BY TABTALE , G.P.
- [Lamar - Idle Vlogger](https://appsupplyindex.com/app/ios-1595314851) · CRAZY LABS BY TABTALE , G.P.
- [My Sticker Room - Decor Game](https://appsupplyindex.com/app/ios-6743738094) · SayGames LTD
- [Authenticator ℠ App](https://appsupplyindex.com/app/ios-6754900760) · BEGAMOB GLOBAL LIMITED

[All apps →](https://appsupplyindex.com/apps)

## Questions

### What if the ad system's sellers.json is incomplete?

When more than half of the IDs apps list for an ad system are missing from its sellers.json, we don't hold those lines against apps; the ad system is shown as "Most listed IDs not found".

### Does a missing ID mean the line is fake?

No. It means the public file doesn't confirm it. Old and closed accounts are the most common reason.

## Related

- [What is app-ads.txt?](https://appsupplyindex.com/learn/what-is-app-ads-txt)
- [DIRECT vs RESELLER](https://appsupplyindex.com/learn/direct-vs-reseller)
- [How the index checks files](https://appsupplyindex.com/methodology)

Based on the [IAB Tech Lab
ads.txt/app-ads.txt](https://iabtechlab.com/ads-txt/) and [sellers.json](https://iabtechlab.com/sellers-json/)
specifications. Numbers are automated observations of public files on the date above.