Have you looked at varnish for caching api responses? Varnish let's you back it with disk and relies on page cache to keep more accessed items in memory. If th

Have you looked at varnish for caching api responses? Varnish let's you back it with disk and relies on page cache to keep more accessed items in memory. If the reverse proxy thing doesn't work I think memcached has two level storage like that now iirc