> For the complete documentation index, see [llms.txt](https://docs.exsat.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.exsat.network/guides-of-data-consensus/others/operation-references/common-operations/refill-btc-for-gas-fees.md).

# Refill BTC for Gas Fees

Executing Synchronizer and Validator actions requires paying gas fees in exSat. These gas fees are deducted from the Synchronizer/Validator account. When the balance is low, you will need to recharge with more BTC as gas fee.

## Check BTC balance for gas fee

You have two ways to check your gas fee balance:

1. Via the web page
2. Using the Client

### 1. Check BTC balance for gas fee via web page

To check the BTC balance for gas fees associated with your Validator account, connect using your **Stake Address** on [this page](https://portal.exsat.network/). If you manage multiple Validators, you can switch between accounts by clicking the 'Switch' button.

<figure><img src="/files/od8Anp2VIti7TeK7frej" alt="" width="280"><figcaption></figcaption></figure>

### 2. Check BTC balance for gas fee via Client

If you're running from source code, please execute "yarn start-commander" to run the client.&#x20;

```
yarn start-commander
```

If you're running with Docker, please use the following commands to run it in interactive mode (assume the container name is commander)

```
docker rm commander
docker run -it --name commander -v $HOME/.exsat/:/app/.exsat -e CLIENT_TYPE=commander exsatnetwork/exsat-client:latest
```

Simply select your role as Synchronizer or Validator to view the details of your account, such as:

<figure><img src="/files/qjcW2rN50aOLPLdeXRao" alt=""><figcaption></figcaption></figure>

## Refill BTC for gas fees

#### Refill BTC by Stake Address

Typically, you can use [this page](https://portal.exsat.network/) to connect your **Stake Address** and top up the gas fee for your Validator Account by clicking on "Recharge" button. If you have multiple Validators, you can switch between them using the "**Switch**" button to top up the gas fee for each one.

<figure><img src="/files/5LEfDK3Zc1Nwp6O6ENsc" alt="" width="279"><figcaption></figcaption></figure>

#### Refill BTC by any EVM address

If you prefer to connect to a different EVM address to top up the gas fee for your Validator, please use this webpage to complete the process.

<figure><img src="/files/FzQU306ylGezLd7JkqfV" alt="" width="288"><figcaption></figcaption></figure>