> ## Documentation Index
> Fetch the complete documentation index at: https://second.tech/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Connection details

Use these endpoints to point `bark`, the Bark SDK, or `barkd` at Second's public Ark server and Esplora chain source on mainnet or signet.

<Tabs>
  <Tab title="Mainnet">
    ```text Ark server theme={"theme":{"light":"github-light","dark":"github-dark"}}
    https://ark.second.tech
    ```

    ```text Esplora theme={"theme":{"light":"github-light","dark":"github-dark"}}
    https://mempool.second.tech/api
    ```
  </Tab>

  <Tab title="Signet">
    ```text Ark server theme={"theme":{"light":"github-light","dark":"github-dark"}}
    https://ark.signet.2nd.dev
    ```

    ```text Esplora theme={"theme":{"light":"github-light","dark":"github-dark"}}
    https://esplora.signet.2nd.dev
    ```
  </Tab>
</Tabs>

## Configure a chain source

With the `bark` CLI, pass only `--ark`: it falls back to the Esplora endpoint for your network when you don't pass `--esplora` or `--bitcoind`. The Bark SDK and `barkd` require an explicit chain source, so set the Esplora endpoint when you configure the wallet, or point them at your own bitcoind node instead.