# Fee management

The logic of the [Client off-chain module](/infrastructure/client-off-chain-module.md) includes a mechanism for automatically calculating the amount of gas required for the transfer. 

At the moment of cross-chain transaction data encryption in the source network, the required amount of source network native currency is calculated to cover the cost of gas for transfer in the destination network. 

This amount of native currency of the source network is sent along with the encrypted data to initialize the transfer.

{% hint style="warning" %}
There is a possibility of a strong surge in the value of gas in the destination network. In this case, the sent native currency of the source network may not be enough to perform the transaction.

In this case, the transaction will be rejected by the [Translator smart contract](/infrastructure/asterizm-connector/translator-smart-contract.md).
{% endhint %}

You can adjust the amount of gas you are willing to spend on each message you transmit in the [Client off-chain module configuration](/guides/getting-started/2.-implement-off-chain-module/simple-implementation-shell-script.md#configuration-file-setup).<br>


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