https://www.google.com/webmasters/sitemaps/ping?sitemap=https://www.example.com/sitemap.xml
https://yandex.ru/blogs/pings?status=success&url=https://www.example.com/sitemap.xml
https://www.bing.com/webmaster/ping.aspx?siteMap=https://www.example.com/sitemap.xml