Kagi is an aggregator for other, some paid, search APIs. They have, at least in the past, served some percentage of their results from Bing's API among others for example. Kagi seems to me to be dependent on these APIs being available, if they were to go away, so would Kagi.
replyI am a happy subscriber of Kagi though, they provide a really excellent service.
I'm not sure Kagi has ever used the Bing API, because (according to Kagi) Bing prohibited changing the results, or merging them with others. Apparently Google is expected to provide access to its index via API soon.
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