I have used the Microsoft memory cache many times in the past, but didn't know how to use it with .NET 6 endpoints, so here is a blog post that should save you a little time if you haven't done it before.

No Dogma Blog (Bryan Hogan)

A short practical guide showing how to use IMemoryCache with .NET 6 minimal API endpoints. The example demonstrates injecting MemoryCache into a MapGet endpoint, checking for a cached value by key, returning it if found, or performing a fake database lookup and storing the result with a 10-second expiry if not found. The full working code is provided inline.

A Simple Example of Using the Memory Cache in .NET 6 with API Endpoints