It's like gRPC in the sense that it's endpoint-centric rather than URL-centric.

At least for a public facing API i would like some more customization possibilities, but this can maybe be done with a seperate BFF / API Gateway / GraphQL gateway etc. Thanks for the answer.

Fair enough :) We're working on adding GraphQL support as an alternative approach to exposing your API, and what you suggested wouldn't be that difficult to add either.