Page change check. Send a public URL and, optionally, the hash from your last check; returns the SHA-256 of the page's main text (scripts, navigation and spacing ignored) and changed true or false. Nothing is stored here; keep the hash yourself. Use to watch a page cheaply, up to 10 checks of a host a minute. Dates or counters in the text count as changes. To read the page use /v1/fetch-page. Typical response under 2 s. Failed calls are not charged.

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