Google's version of this is finite and responds to what it finds. Slow responses, error pages and endless redirect chains all consume it, which is why those findings matter beyond the pages they appear on.
Our version is the number we meter. Pages are pooled across the agency's whole portfolio rather than capped per site, because a portfolio is never evenly sized. Going over slows crawl frequency and says so on the dashboard, and it never bills.
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No card, and the free tier does not expire — the first verdict takes about six weeks to arrive.