mukan-ibc/docs/versioned_docs/version-v6.3.x/02-apps/02-interchain-accounts/06-parameters.md

title	sidebar_label	sidebar_position	slug
Parameters	Parameters	6	/apps/interchain-accounts/parameters

Parameters

The Interchain Accounts module contains the following on-chain parameters, logically separated for each distinct submodule:

Controller Submodule Parameters

Key	Type	Default Value
ControllerEnabled	bool	true

ControllerEnabled

The ControllerEnabled parameter controls a chains ability to service ICS-27 controller specific logic. This includes the sending of Interchain Accounts packet data as well as the following ICS-26 callback handlers:

• OnChanOpenInit
• OnChanOpenAck
• OnChanCloseConfirm
• OnAcknowledgementPacket
• OnTimeoutPacket

Host Submodule Parameters

Key	Type	Default Value
HostEnabled	bool	true
AllowMessages	[]string	["*"]

HostEnabled

The HostEnabled parameter controls a chains ability to service ICS-27 host specific logic. This includes the following ICS-26 callback handlers:

• OnChanOpenTry
• OnChanOpenConfirm
• OnChanCloseConfirm
• OnRecvPacket

AllowMessages

The AllowMessages parameter provides the ability for a chain to limit the types of messages or transactions that hosted interchain accounts are authorized to execute by defining an allowlist using the Protobuf message type URL format.

For example, a Cosmos SDK-based chain that elects to provide hosted Interchain Accounts with the ability of governance voting and staking delegations will define its parameters as follows:

"params": {
    "host_enabled": true,
    "allow_messages": ["/cosmos.staking.v1beta1.MsgDelegate", "/cosmos.gov.v1beta1.MsgVote"]
}

There is also a special wildcard "*" value which allows any type of message to be executed by the interchain account. This must be the only value in the allow_messages array.

"params": {
    "host_enabled": true,
    "allow_messages": ["*"]
}