code: func (whisper *Whisper) APIs() []rpc.API {
  	return []rpc.API{
  		{
  			Namespace: ProtocolName,
  			Version:   ProtocolVersionStr,
  			Service:   NewPublicWhisperAPI(whisper),
  			Public:    true,
  		},
  	}
  }
docs: // APIs returns the RPC descriptors the Whisper implementation offers