Interchain Accounts allow developers to override the default chains and security models configured in the InterchainAccountRouter. These are useful for:
  • Calling an ICA on chains not configured in InterchainAccountRouter.
  • Using different ISM than the defaults configured in the InterchainAccountRouter
  • Adjusting the gas limit for IGP payments or setting other parameters.

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Interface

The callRemoteWithOverrides function looks similar to the callRemote function, but takes three additional arguments. First, developers can override _router, the address of the InterchainAccountRouter on the remote chain. This allows developers to control an ICA on remote chains that have not been configured on the local InterchainAccountRouter. Second, developers can override _ism, the address of the remote interchain security module (ISM) used to secure their ICA. This ISM will be used to verify the interchain messages passed between the local and remote InterchainAccountRouters. This allows developers to use a custom security model that best suits their needs. Third, developers can override _hookMetadata, the StandardHookMetadata metadata passed to the message hooks for each ICA call (for example, overriding the gas limit for the IGP payment). 
    /**
     * @notice Dispatches a sequence of remote calls to be made by an owner's
     * interchain account on the destination domain
     * @dev Recommend using CallLib.build to format the interchain calls
     * @param _destination The remote domain of the chain to make calls on
     * @param _router The remote router address
     * @param _ism The remote ISM address
     * @param _calls The sequence of calls to make
     * @param _hookMetadata The hook metadata to override with for the hook set by the owner
     * @return The Hyperlane message ID
     */
    function callRemoteWithOverrides(
        uint32 _destination,
        bytes32 _router,
        bytes32 _ism,
        CallLib.Call[] calldata _calls,
        bytes memory _hookMetadata
    ) public payable returns (bytes32)

    function getRemoteInterchainAccount(
        address _owner,
        address _router,
        address _ism
    ) public view returns (address)