# Market Lab v0.1.73 (/changelog/v0.1.73)



## Use an existing agent [#use-an-existing-agent]

```bash
cargo run -- auth set bulk --agent --account <OWNER_ADDRESS>
cargo run -- auth set hyperliquid --agent --account <OWNER_ADDRESS>
cargo run -- auth set hyperlink --agent --account <OWNER_ADDRESS>
```

Paste the already-approved agent private key at the hidden prompt. Its public address is derived automatically.

Server support: `--agent-stdin --output json`. Existing keys require `--replace`.

[Authentication](/authentication#use-an-existing-agent).