Data · monthly

Share of preflight

Of the verified agent requests that sites checked with CrawlCheck, how many arrived carrying a CrawlCheck receipt the site accepted. It is the share of agents that asked before they acted.

Month to date, rebuilt from the event log every 10 minutes (last 2026-10-16 07:23 UTC). Each month is sealed and signed once it ends; sealed months stay at /api/v1/share-of-preflight?month=YYYY-MM.

By agent

Receipts from agents not seen verified

Receipts name the agent their caller declared. These names matched no agent that sites verified this month (a product name rather than a crawler name, or an agent still in testing).

How it is counted

Sites that check visitors with Visitor Resolve report each agent request; a request counts once its agent is verified (address inside the operator’s published ranges, or a valid signature from its own origin). When an agent sends the CrawlCheck-Receipt header, the site checks it and the check is counted, accepted or not. Nothing about the visitor is kept: no addresses, no user agents; site hosts are counted, not published. This lossless count began on 7 October 2026 at 10:33 AM MDT; the daily tallies kept before then are at /api/v1/decisions and /api/v1/visitor/stats.