Quantcastbot

Quantcastbot does two different kinds of work for Quantcast. It tests advertisements and their destination pages for quality assurance, and it reads page content for Quantcast's Interest-Based Audience technology. The difference matters because the two modes do not follow the same crawl rules.

For quality assurance, the bot follows the click-through link in an advertisement and opens only that landing page. Quantcast repeats checks while an ad is being delivered, and a test can fire impression or click trackers. Those events are non-human traffic and should be removed from campaign and analytics counts. Quantcast says this mode does not obey robots.txt because the crawler is following an ad.

The audience mode samples 2 to 5 million sites per day. It extracts page titles, descriptions, headings, and paragraph text, then uses that material to categorize interests for advertising. Quantcast limits this crawl to roughly 1,000 URLs per domain each day, spread over several hours, and honors URL or domain disallows in robots.txt.

Both uses belong to advertising. Quantcast does not present the bot as an AI answer indexer or a model-training collector. Its practical effects are ad review, audience categorization, and extra tracker calls that need filtering. It does not confer visibility in AI search.