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WorthCheck does not buy a clickstream panel. Each report is assembled from public APIs plus a published traffic curve.
Tranco is a research ranking of popular websites. WorthCheck reads the current rank and up to 30 days of history. Daily visitors are modelled as 900 million divided by that rank. Rank 1 is Google-scale; rank 1,000 is far smaller.
Registrar, created date, expiry, status and nameservers come from RDAP. Domain age can slightly raise or lower the model: very new sites are discounted; very old ones get a small CPM bump.
Cloudflare DNS (or a local lookup) gives an A record. IP geolocation maps that host to country, city, ISP and organisation. Country selects the CPM table — US and CH pay more than IN or PK in this model.
WorthCheck fetches the public homepage over HTTPS then HTTP, reads title and description, and records whether the site answered. That is reachability, not content scoring.
Successful lookups can stay in memory for about six hours so repeat searches do not hammer the same public APIs.