rBTC is the token used to [pay for the execution](/concepts/rbtc/gas/) of transactions in Rootstock. You can [convert BTC into rBTC](conversion.md) by sending BTC through the [Powpeg](/concepts/powpeg/) (both in Testnet and Mainnet), or by using the [faucet in Testnet](https://faucet.rootstock.io/), or via decentralized exchanges.

:::info[Additional Faucet Options (Please note these faucets may have daily limits)]

* Use [Thirdweb Faucet](https://thirdweb.com/rootstock-testnet): This faucet offers a convenient way to get free test rBTC tokens for development and testing. Its max daily token allocation is `0.01` tRBTC.
* Use [Blast Faucet](https://blastapi.io/faucets/rootstock-testnet): This faucet offers a convenient way to get free test rBTC tokens for development and testing. It has a higher max daily token allocation of `0.1` tRBTC.

:::

See [supported wallets](/dev-tools/wallets/).



## rBTC (Smart Bitcoin in Mainnet)

<table >
  <tbody>
    <tr>
      <td scope="row">Token Name</td>
      <td><a href="https://coinmarketcap.com/currencies/rsk-smart-bitcoin/" target="_blank">rBTC</a></td>
    </tr>
    <tr>
      <td scope="row">Total Supply</td>
      <td>21,000,000 rBTC</td>
    </tr>
    <tr>
      <td scope="row">Circulating supply</td>
      <td><a href="https://be.explorer.rootstock.io/circulating" target="_blank">API</a></td>
    </tr>
    <tr>
      <td scope="row">Contract Type</td>
      <td>Native (<a href="https://explorer.rootstock.io/address/0x0000000000000000000000000000000001000006" target="_blank">Bridge contract</a>)</td>
    </tr>
    <tr>
      <td scope="row">How to get</td>
      <td>
        <ul>
            <li><a href="https://rootstock.io/rbtc/#get-rbtc" target="_blank">Exchanges and Bridges to get rBTC</a></li>
        </ul>
      </td>
    </tr>
    <!-- <tr>
      <td scope="row">Logo</td>
      <td>
        <img src="/img/rsk/RBTC-logo.png" />
        <a href="/img/rsk/RBTC-logo.png" target="_blank">RBTC</a>
      </td>
    </tr> -->
  </tbody>
</table>

## tRBTC (Smart Bitcoin in Testnet)

<table >
  <tbody>
    <tr>
      <td scope="row">Token Name</td>
      <td>tRBTC</td>
    </tr>
    <tr>
      <td scope="row">Total Supply</td>
      <td>21,000,000 tRBTC</td>
    </tr>
    <tr>
      <td scope="row">Circulating supply</td>
      <td><a href="https://be.explorer.testnet.rootstock.io/circulating" target="_blank">API</a></td>
    </tr>
    <tr>
      <td scope="row">Contract Type</td>
      <td>Native (<a href="https://explorer.testnet.rootstock.io/address/0x0000000000000000000000000000000001000006" target="_blank">Bridge contract</a>)</td>
    </tr>
    <tr>
      <td scope="row">How to get</td>
      <td>
        <ul>
            <li><a href="https://faucet.rootstock.io" target="_blank">Faucet</a></li>
        </ul>
      </td>
    </tr>
  </tbody>
</table>