Each edition has a live page that updates as the measurements do, an Atom feed, signed JSON, and a written post for each issue. Figures come from the same records the API serves; nothing in an edition is estimated.
Monthly
What sites serve AI crawlers across the open dataset and the weekly census of the most-visited sites: refusals, machine files, what a crawler actually receives.
Latest: 139,788 homepages in four days: what AI crawlers get
First: The state of AI visibility, September 2026: what 1,364 scans say a crawler actually receives
Monthly, with weekly signed editions
What each named AI and search agent did on this site, from requests verified against its operator's published ranges: robots.txt, forged names, busiest minute.
Latest: Agent conduct, October 2026: 34,676 verified crawler requests, and what they did with robots.txt
Monthly, sealed after the month closes
Whether the remote MCP servers in the official registry answer, how fast, and how often their tool lists change. No tool is ever called.
Latest: MCP reliability, October 2026: 6,000 remote MCP servers, 39,484 handshakes
Monthly, sealed after the month closes
Of the agent requests connected sites verified, the share that arrived with a CrawlCheck receipt the site accepted.
Latest: Share of preflight, October 2026: 0 of 5,643 verified agent requests carried a receipt
All findings and guides: /blog · the full Atom feed · the open data: /data.