Do API routes cache their responses?

[long niche]

Writing an API server in Next (for ease of use, refactor soon) and wanted to know if API routes cache their responses provided I have them setup through Nginx.

[winged light]

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[formal brook]

API Routes, are you referring to Pages Router one? If yes, they are not cached. Only GET route handlers (in App Router) are cached by default.

[long niche]

How would I go about setting this up instead then? The calculations i'm doing are quite heavy and involve point-in-polygon tests over 300 objects.