My API is using gRPC, not REST. Can I still fuzz it with Mayhem for API?

One more question. My API is using gRPC, not REST. Can I still fuzz it with Mayhem for API?

Yes, you can fuzz gRPC servers with Mayhem for API. The basic idea is to use gRPC gateway to rewrite REST requests into proto requests, and proto responses back into REST responses. Thus, Mayhem for API fuzzes a REST proxy in front of a gRPC server that handles the translation between the two. We have an example here: https://github.com/ForAllSecure/mapi-grpc-example
as well as full documentation here: gRPC Fuzzing - Mayhem for API