24% of ads.txt entries fail sellers.json verification. Verified supply earns up to 6x the CPM. We cross-reference 362K+ domains against 2,000+ SSPs and monitor for changes daily.
Tracking sellers.json from
The verification gap
DSPs verify every supply path before bidding. If your ads.txt entries don't match sellers.json records, they skip your inventory. No error message. No notification. CPMs just drift down.
An SSP quietly changes their sellers.json. Your verified path disappears overnight. Bids stop flowing. Revenue drops. You never find out why because nothing in your dashboard shows it.
437K new ads.txt lines were added last month alone. The supply chain shifts daily.
This is happening right now across 24% of the supply chain. The only question is whether it's happening to you.
How silent revenue loss works
SSP changes sellers.json without telling you
Your ads.txt entry can no longer be verified
DSPs silently skip your inventory on that path
Revenue drops. Nothing in your dashboard explains it.
Source: Index Exchange Research
Free tools check formatting. Paid tools check syntax. BeamFlow verifies every line against 2,000+ live sellers.json files. Even on the free plan.
What BeamFlow does
Not a one-time scan. Continuous supply chain verification that catches changes before they cost you.
Every ads.txt line cross-referenced against 2,000+ sellers.json files. Every seller ID matched. Every relationship confirmed. You see exactly what DSPs see.
SSP changes sellers.json? You know within hours, not weeks. New errors in your ads.txt? Alerted before DSPs act on them. Unauthorized seller appears? Flagged immediately.
SSP sends 80 new lines? Paste them in. Instant dedup, syntax check, sellers.json verification. Then host your file directly through BeamFlow — one redirect and every edit goes live in 5 minutes. No more FTP. No more waiting on your dev team.
Now available: Supply Chain API for AI agents and developers. Verify any domain programmatically. Learn more
Real verification
Most tools check if your ads.txt file is formatted correctly. That's table stakes. BeamFlow verifies every line against the actual sellers.json files of 2,000+ SSPs. We confirm the seller ID exists, the relationship type matches, and the authorization is current.
The result: you see exactly what DSPs see when they evaluate your supply chain. If a path won't pass SPO verification, you know before they do.
Two products. One supply chain.
Publishers lose CPMs from unverified ads.txt entries. SSPs lose buyers from messy sellers.json. Both problems start with the same thing: no visibility.
“My CPMs are down and I can't figure out why.”
DSPs verify your ads.txt against sellers.json before bidding. If it doesn't match, they skip you silently. We show you exactly which lines fail, alert you when SSPs change your status, and give your team tools to keep ads.txt verified.
“Buyers are cutting SSPs from their SPO short list. Are we next?”
DSPs are consolidating to fewer, cleaner supply paths. A messy sellers.json means lost bids. We audit yours against 362K+ publisher ads.txt records and show where verification fails before buyers notice.
How it works
Enter your domain. Instant health report, free.
See what’s broken. Edit lines directly in BeamFlow.
Daily alerts when SSPs change. Your file stays verified.
Founded by Guy after 15 years in adtech, watching publishers lose revenue to supply chain problems nobody could see. BeamFlow started as a personal tool to automate what shouldn't be manual. Now it monitors the entire programmatic ecosystem.
362K+ domains. 60M+ lines. 2,000+ sellers.json. Approaching full coverage.
Simple pricing
Scan free. Host your ads.txt free. Starter adds the full report, daily monitoring, alerts, and version history.
Free
Scan free. Host free.
Monitor, protect, and scale
Most publishers recover more than $49/mo in their first scan. Recovering just 5% of lost revenue from unverified paths pays for the tool many times over.
Also available: SSP Intelligence ($499/mo) and Enterprise plans.
BeamFlow monitors the programmatic supply chain. We cross-reference your ads.txt against 2,000+ SSP sellers.json files (for publishers) or your sellers.json against 362K+ publisher ads.txt records (for SSPs). We monitor continuously and alert you when things change.
The free scan gives you your health score and full file with color-coded status per line: green (verified), red (unverified), yellow (warning). You see which lines have problems but not why or how to fix them. Starter ($49/mo) unlocks the full detailed report, sellers.json verification, monitoring alerts, ads.txt management, and up to 10 domains.
Supply Path Optimization is how DSPs choose which supply paths to use and which to block. They verify every path against ads.txt and sellers.json. If your entries don't match, your inventory gets skipped silently. Verified supply earns up to 6x higher CPMs.
Constantly. SSPs update sellers.json, publishers modify ads.txt, new relationships form, old ones break. That's why continuous monitoring matters more than one-time scans. Our alerts catch changes within hours, not weeks.
Yes. Our SSP Intelligence plan ($499/mo) includes sellers.json health audit, publisher verification across 362K+ ads.txt records, competitive intelligence (adoption count, lost/gained publishers, competitor comparison), and monitoring alerts.
A single scan shows today's problems. But SSPs change sellers.json daily. Publishers modify ads.txt. New errors appear. Without monitoring, you're fixing yesterday's issues while new ones accumulate. Monitoring catches changes before they cost you revenue.
BeamFlow hosts your ads.txt file on a subdomain (yourname.beamflow.co). You add a single redirect from your domain's /ads.txt to your hosted file. After that, every edit you make in BeamFlow goes live in 5 minutes — no FTP, no dev team, no waiting. Free for 1 domain. Starter plan includes hosting for up to 10 domains.
We only analyze publicly available ads.txt and sellers.json files. These are the same files DSPs and buyers already access. Your analysis results are private to your account.
Still have questions? Get in touch
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