By default, the Yandex Safe Browsing API allows you to check 100,000 URLs per day. If you require broader access - for example, you need to increase the number of URLs checked, or you want to check whether links belong to additional categories (pornography, narcotics, etc.) - send us email, and we can discuss partnership options.
Safe Browsing technology is already enabled in Yandex.XML. The service flags potentially dangerous links in the search results.