How to use it
Run 1 to 3 free
Enter your domain in the free checker. It reads your ads.txt and cross-checks it against sellers.json data from every SSP you declare.
Work through 4 to 8
You need ad server and SSP reporting access. Nothing public can answer these.
Add your segment
Run the add-ons that match your inventory: CTV/FAST, mobile app or web.
The checklist
Free to copy. No signup. Nothing shortened.
Supply path
- 1
Full ads.txt / app-ads.txt review
Every authorized seller, DIRECT vs. RESELLER, and why each reseller entry exists.
- 2
Sellers.json cross-check
Does what your SSPs actually confirm match what your ads.txt claims.
- 3
Reseller count and staleness
When was each entry last verified, not just last edited.
Auction and yield
- 4
Header bidding timeout and auction logic
Set once at implementation, rarely revisited.
- 5
Floor-price ownership and seasonal movement
Who owns the decision, and has it moved with demand over the last two quarters.
- 6
Direct-sold vs. programmatic prioritization
Is direct-sold inventory prioritized correctly in the ad server, or only on paper.
Reporting
- 7
Gross bid data vs. net payout
Do you see gross, or only what lands in your account after fees.
- 8
Ad-server vs. SSP-reported impressions
Checked by placement, where discrepancies concentrate.
Segment add-ons (where relevant)
- 9
CTV/FAST: pod rules and competitive separation
Checked across every break type, not only the first one configured.
- 10
CTV/FAST: fill rate and CPM viability by channel
Which channels sit below a viable line, and has anyone asked why.
- 11
CTV/FAST: signal pass-back
If a distribution partner holds device or household signal, is it passed back to you.
- 12
Mobile: ATT prompt and current iOS match rate
The rate today, not the rate at launch.
- 13
Mobile: Android/iOS eCPM gap and mediation response rates
Is the gap structural, or has it widened without a named cause.
- 14
Web: impression discrepancies and exchange win-rate concentration
By placement and size.
What this checklist will not tell you
- It tells you where to look, not what you will find. A stale reseller entry or an old timeout is a lead, not a revenue number.
- Points 4 to 14 need access to your ad server and SSP reporting. A public check cannot answer them, ours included.
- Knowing the list does not do the slow part: matching your sellers.json evidence line by line against each SSP.
Practical questions
Is this really free?
Yes. The full checklist is on this page, free to copy or download, no email. The free checker asks for an email only to send you the full result.
Who is it for?
Publishers, sales houses, ad networks and CTV/FAST sellers who run their own programmatic stack and want to check it before paying anyone.
Which points does the free checker cover?
Points 1 to 3: your ads.txt, cross-checked against real sellers.json data crawled from the SSPs you declare. It never relies on self-reported data.
What does a Yield Review add?
We run all 14 points on your actual accounts for a fixed €1,500 and report each finding with the calculation shown. If we cannot quantify a finding, we report it without a number.