Package crypt is an onion message layer which specifies that subsequent content will be encrypted.

Package delay provides an onion message type that allows a client to specify an arbitrary delay time before processing the rest of an onion message.

Package exit is an onion message type that contains a payload intended to be forwarded to the exit service of a relay.

Package forward is an onion message layer that specifies a single redirection for the remainder of the onion.

Package getbalance provides an onion message layer type that makes a request for the current balance of a session.

Package reverse provides a message type for the forwarding directions in a 3 layer routing header.

Package session provides an onion message type that delivers the two session private keys to be associated with a session, for which the hash of the secrets was used as the payment preimage for starting a session.