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CLI

A user can query and interact with the Interchain Accounts module using the CLI. Use the --help flag to discover the available commands: 
simd query interchain-accounts --help
Please not that this section does not document all the available commands, but only the ones that deserved extra documentation that was not possible to fit in the command line documentation.

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Controller

A user can query and interact with the controller submodule.

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Query

The query commands allow users to query the controller submodule. 
simd query interchain-accounts controller --help

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Transactions

The tx commands allow users to interact with the controller submodule. 
simd tx interchain-accounts controller --help

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send-tx

The send-tx command allows users to send a transaction on the provided connection to be executed using an interchain account on the host chain. 
simd tx interchain-accounts controller send-tx [connection-id] [path/to/packet_msg.json]
Example: 
simd tx interchain-accounts controller send-tx connection-0 packet-data.json --from cosmos1..
See below for example contents of packet-data.json. The CLI handler will unmarshal the following into InterchainAccountPacketData appropriately. 
{
  "type": "TYPE_EXECUTE_TX",
  "data": "CqIBChwvY29zbW9zLmJhbmsudjFiZXRhMS5Nc2dTZW5kEoEBCkFjb3Ntb3MxNWNjc2hobXAwZ3N4MjlxcHFxNmc0em1sdG5udmdteXU5dWV1YWRoOXkybmM1emowc3psczVndGRkehItY29zbW9zMTBoOXN0YzV2Nm50Z2V5Z2Y1eGY5NDVuanFxNWgzMnI1M3VxdXZ3Gg0KBXN0YWtlEgQxMDAw",
  "memo": ""
}
Note the data field is a base64 encoded byte string as per the proto3 JSON encoding specification. A helper CLI is provided in the host submodule which can be used to generate the packet data JSON using the counterparty chain’s binary. See the generate-packet-data command for an example.

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Host

A user can query and interact with the host submodule.

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Query

The query commands allow users to query the host submodule. 
simd query interchain-accounts host --help

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Transactions

The tx commands allow users to interact with the controller submodule. 
simd tx interchain-accounts host --help
generate-packet-data
The generate-packet-data command allows users to generate interchain accounts packet data for input message(s). The packet data can then be used with the controller submodule’s send-tx command. 
simd tx interchain-accounts host generate-packet-data [message]
Example: 
simd tx interchain-accounts host generate-packet-data '[{
  "@type":"/cosmos.bank.v1beta1.MsgSend",
  "from_address":"cosmos15ccshhmp0gsx29qpqq6g4zmltnnvgmyu9ueuadh9y2nc5zj0szls5gtddz",
  "to_address":"cosmos10h9stc5v6ntgeygf5xf945njqq5h32r53uquvw",
  "amount": [
    {
      "denom": "stake",
      "amount": "1000"
    }
  ]
}]' --memo memo
The command accepts a single sdk.Msg or a list of sdk.Msgs that will be encoded into the outputs data field. Example output: 
{
  "type": "TYPE_EXECUTE_TX",
  "data": "CqIBChwvY29zbW9zLmJhbmsudjFiZXRhMS5Nc2dTZW5kEoEBCkFjb3Ntb3MxNWNjc2hobXAwZ3N4MjlxcHFxNmc0em1sdG5udmdteXU5dWV1YWRoOXkybmM1emowc3psczVndGRkehItY29zbW9zMTBoOXN0YzV2Nm50Z2V5Z2Y1eGY5NDVuanFxNWgzMnI1M3VxdXZ3Gg0KBXN0YWtlEgQxMDAw",
  "memo": "memo"
}

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gRPC

A user can query the interchain account module using gRPC endpoints.

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Controller

A user can query the controller submodule using gRPC endpoints.

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InterchainAccount

The InterchainAccount endpoint allows users to query the controller submodule for the interchain account address for a given owner on a particular connection. 
ibc.applications.interchain_accounts.controller.v1.Query/InterchainAccount
Example: 
grpcurl -plaintext \
    -d '{"owner":"cosmos1..","connection_id":"connection-0"}' \
    localhost:9090 \
    ibc.applications.interchain_accounts.controller.v1.Query/InterchainAccount

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Params

The Params endpoint users to query the current controller submodule parameters. 
ibc.applications.interchain_accounts.controller.v1.Query/Params
Example: 
grpcurl -plaintext \
    localhost:9090 \
    ibc.applications.interchain_accounts.controller.v1.Query/Params

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Host

A user can query the host submodule using gRPC endpoints.

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Params

The Params endpoint users to query the current host submodule parameters. 
ibc.applications.interchain_accounts.host.v1.Query/Params
Example: 
grpcurl -plaintext \
    localhost:9090 \
    ibc.applications.interchain_accounts.host.v1.Query/Params