PubMonitor is a monthly index of the ad-funded web. Enter a domain or pub-xxxx ID to see sites observed on that publisher — with traffic and a labeled earnings estimate. Unlike ads.txt reverse lookup, portfolios come from month-stamped observed placements, not declarations that can be forged or go stale. Rank sites and publishers, monitor movers, share a report, or query the index from Claude/Cursor via MCP. Free preview. Sign-in adds history and monitors. Not affiliated with Google.