Free Watch for MSPs
MTA-STS Watch
Which domains publish an MTA-STS policy, and when it moves between enforce, testing, and none.
Free Watch for supply-path analysts
Seller Directory Watch
Which sellers an ad system adds to or removes from its sellers.json.
Seller Directory Watch reads its source, sellers.json files published by each ad system, daily, and has confirmed 0 changes since Nov 5, 2026.
Source: sellers.json files published by each ad system (IAB Tech Lab sellers.json). Checked daily.
Ad systems watched410Sites in the Tranco top 50,000 that publish a sellers.json under 1 MB; a larger file is left out
History startsNov 5, 2026Nothing older
On timeCoverage numbers arrive after 14 days.
Latest changes
JSONNo changes yet. The robot checks daily.
Alerts by email come with paid Watches. This Watch's changes are free to read here and as JSON.
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Which sites publish security.txt, and when its contact or expiry date changed.
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When the US State Department updates its travel information, country by country.
Which sellers an ad system adds to or removes from its sellers.json. It does not determine compliance, approval, or intent.