To use the gRPC API, you need a gRPC client. We provide several client scripts inside the ./client directory. Each script is named according to the operation it performs against the gRPC API (e.g. the feed.js script sends the Feed operation). Each script can be invoked by running the corresponding NPM script defined in package.json, e.g. npm run feed.
In case you prefer a GUI client, we recommend BloomRPC:
