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

# Network access

> Allow terrapinfinance.com when your MCP client runs in a sandbox.

Most setups need nothing here. This page matters only if your assistant runs somewhere with restricted outbound network access: a container, an agent sandbox with a domain allowlist, or a corporate proxy.

There is one host to allow: `terrapinfinance.com`. It serves the MCP endpoint, every API call made through it, and document downloads. Over MCP, `download_document` returns a short-lived URL rather than the file bytes, and fetching that URL is an ordinary network request your egress rules apply to — but it points at `terrapinfinance.com` as well, so the single entry covers it.

<Note>
  Terrapin used to serve download URLs from `s3.eu-central-003.backblazeb2.com`. It no longer does, and you can drop that host from your allowlist.
</Note>

## Where to set it

In Claude Desktop, the allowed-domains list is under **Settings → Capabilities → Network access** on Free, Pro, and Max. On Team and Enterprise it is an administrator policy under **Organization settings → Capabilities → Code execution → Allow network egress**, and the in-app setting will not override it.

In Claude Code, run `/sandbox` to inspect the current policy, or add the host to `sandbox.network.allowedDomains` in `~/.claude/settings.json`:

```json settings.json theme={"theme":{"light":"catppuccin-latte","dark":"github-dark-high-contrast"}}
{
  "sandbox": {
    "network": {
      "allowedDomains": [
        "terrapinfinance.com"
      ]
    }
  }
}
```

Network policy is read when a session starts, so open a new conversation before testing. A corporate proxy also has to let `POST https://terrapinfinance.com/mcp` through with the `Authorization` header intact; proxies that strip it make every call fail with 401.


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