I can't find the auto-complete api of some search engines

Greeting, first of all, I’m a Firefox Android user. Your problem is this; I’m trying to understand and find the auto-complete urls (we can say API) of search engines like Startpage, Yandex. I tried to look at the files in the “searchplugins” folder, but all failed. I haven’t found much on the Internet about this topic, I hope you can help me.

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It took me a long time…

suggest.yandex.com.tr/suggest-ff.cgi?part=%s
startpage.com/osuggestions?q=%s

Sorry, you can go on.