> Some ad systems don't publish a readable sellers.json: there's no file, it isn't valid JSON, it's empty, or the server refuses automated requests. Lines for those ad systems can't be checked.

Source: https://appsupplyindex.com/fix/sellers-json-not-available · 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 can't some app-ads.txt lines be verified against sellers.json?

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

**Short answer:** Some ad systems don't publish a readable sellers.json: there's no file, it isn't valid JSON, it's empty, or the server refuses automated requests. Lines for those ad systems can't be checked.

**683 of 883**
ad-monetized top US apps in this index have this finding (77%)

## Why it matters

This is a gap on the ad system's side, so no points are deducted from apps. Buyers may still treat paths through unverifiable ad systems with more caution.

## How to fix it

1. Ask the partner to publish sellers.json at the root of its domain, as the IAB Tech Lab sellers.json specification describes, and to allow automated access to it.

## Apps with this finding

Each report lists the exact lines involved.

- [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.
- [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.
- [Word Search Explorer®](https://appsupplyindex.com/app/ios-1602508478) · PlaySimple Games Pte Ltd
- [Authenticator ℠ App](https://appsupplyindex.com/app/ios-6754900760) · BEGAMOB GLOBAL LIMITED
- [iCardiac: Heart Rate & Health](https://appsupplyindex.com/app/ios-6468660073) · BEGAMOB GLOBAL LIMITED

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

## Questions

### Does this lower my score?

No. These lines are shown for information only.

## 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.