When should you use a CDN for API caching?

hey everyone ive been thinkin a lot about api performance lately were seein increasin latency for our users and im explorin diffrent caching stratagies beyond applicaton level caching im considerin usin a cdn to cache api responses what r ur thoughts and experiences w this when do u find it most benificial to put a cdn in front of ur apis and whats the common pitfalls to watch out for especially w dynamic or personalzed content