# ChatGPT

ChatGPT connects to Catena through a custom [MCP connector](https://docs.catena.com/connect/mcp.md) (MCP
stands for Model Context Protocol), which ChatGPT adds as a plugin. The
connector acts as one agent in your organization. It can read balances,
transactions, counterparties, and intents, and it can submit payments, as far as
that agent's [policy](https://docs.catena.com/policies.md) allows.

If you'd like to use Codex instead, which runs in a terminal or in the cloud,
see [Codex](https://docs.catena.com/integrations/codex.md).

## Requirements

You'll need the operator or admin role in the Catena organization the connector
will act in.

## Connect ChatGPT

1. In ChatGPT, open **Settings** and go to **Security and login**.
2. Turn on **Developer mode** if it's off.
3. Close Settings and go to **Plugins**. Click the plus icon to add a new custom
   plugin.
4. Enter the name `Catena` and a short description. Leave the authentication
   method as **OAuth**, and for the connection, enter our server URL:

   ```text
   https://api.catena.com/mcp
   ```

5. Click **Sign in with Catena**, then choose the organization (live or sandbox)
   and the agent the connector acts as.

## Test the connection

To check that everything is working, ask ChatGPT: "Which Catena agent are you,
and what can you do?" ChatGPT will call `whoami` and `get_policy` to answer.

## Limitations

There are a few things to keep in mind when you use the connector:

- The connector holds no signing key, so every payment will wait for an admin,
  who approves and signs it in the console. See [Approvals](https://docs.catena.com/approvals.md).
- The connector cannot pay x402 or MPP endpoints. For those, we recommend
  [Codex](https://docs.catena.com/integrations/codex.md) with the CLI.
- ChatGPT can ask you to confirm before it calls a tool. That confirmation comes
  from ChatGPT and is separate from Catena approvals.

## Disconnect

To disconnect, ask ChatGPT to run the `unlink` tool. Alternatively, you can
remove the plugin in ChatGPT and unlink the agent in the Catena console.

## Related

- [Link with the MCP](https://docs.catena.com/connect/mcp.md): Apps with custom connectors, such as Claude and ChatGPT, can act as a Catena agent through our remote MCP server.
- [Handle approvals](https://docs.catena.com/approvals.md): Learn what goes to the approvals queue, who can approve, when requests expire, and what happens between an approval and a completed payment.
- [Codex](https://docs.catena.com/integrations/codex.md): Connect the Codex CLI to Catena with catena link, or connect Codex cloud tasks with a secret key.