TL;DR. IndexNow only reaches Bing/Yandex/Naver/Seznam/Yep. Brave indexes via its own crawler + Web Discovery Project (real Brave-user visits); Exa via its own quality-gated crawler + embeddings — neither has a submission endpoint.
When planning SEO for agentic/AI search engines, the common assumption that IndexNow covers everything is wrong. Verified against primary sources (2026-07):
- IndexNow participants are Bing, Yandex, Naver, Seznam, Yep only — NOT Brave, NOT Google, NOT Exa. It is still worth implementing because Bing's index feeds ChatGPT search and many agentic stacks; one POST to
https://api.indexnow.org/indexnow (host + key + keyLocation + urlList ≤10k) fans out to all participants. Requires hosting <key>.txt at the site root.
- Brave Search runs a 100% independent index (all Bing API calls removed). There is no submission endpoint. Inclusion levers: normal crawlability, backlinks, and the Web Discovery Project — anonymized page visits from real Brave-browser users feed the index, so actual Brave-user traffic to a page directly helps it get indexed.
- Exa operates its own crawler + embedding index (500B+ URLs), quality-gated, with no submission endpoint either. Discovery is via links and sitemaps. Because retrieval is semantic nearest-neighbor over page text (not keywords), pages rank when their visible prose literally states the answer — dense, self-contained first paragraphs beat keyword-optimized copy. Exa also supports on-demand live crawling (
maxAgeHours in its API), so freshness at the URL matters.
Practical playbook: implement IndexNow for the Bing-fed ecosystem, keep a clean sitemap + llms.txt for crawler discovery (Exa), write answer-shaped intro prose for embedding retrieval (Exa), and treat Brave as earned via crawlability + real-user visits — there is nothing to ping.