IndexNow
IndexNow is an open-source protocol that lets websites instantly notify search engines when content is added, updated, or deleted. It's supported by Bing, Yandex, Naver, Seznam.cz, and Yep, but NOT by Google, which has stated it has no plans to adopt it.
In depth
Submission process: POST a JSON payload with up to 10,000 URLs to a single IndexNow endpoint; the receiving engine forwards to all participating engines automatically.
Verification: requires a static key file at the site root (e.g., /a1b2c3d4.txt containing the key string) so search engines can confirm domain ownership.
Bing typically picks up submitted URLs within 24-48 hours; Yandex slightly slower; Naver/Seznam/Yep variable.
Quota is generous (10K URLs per submission with no daily cap) but engines may rate-limit re-submissions of the same URL within a 7-day window.
Common misconception
IndexNow does NOT push URLs into Google's index. For Google, the only API-side levers are sitemap resubmission (signals re-process) and manual 'Request Indexing' in GSC URL Inspection (UI-only, capped at ~10/day per property).
Source: IndexNow: Official protocol documentation
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