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By default, every order asks your wallet to sign. That is safe, but a popup on each action gets in the way of active trading. An agent wallet fixes this.

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What it is

An agent wallet (also called an API wallet on Hyperliquid) is a separate key, generated in your browser, that you authorize once to sign orders on your behalf. After that, orders sign locally and instantly, with no popup.
1

Enable instant trading

From the trade page, choose to enable the agent wallet. Your main wallet signs one approval (approveAgent).
2

Orders sign locally

From then on, placing and cancelling orders is instant. No wallet prompt per order.

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What it can and cannot do

Can

Place, modify, and cancel orders, and adjust leverage.

Cannot

Withdraw funds or transfer your balance. Ever. Withdrawals always require your main wallet.
The agent key lives only in your browser and is scoped to trading. It is not shared with Agonaut’s servers.

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Revoking

You can revoke the agent at any time. After revoking, orders fall back to a normal wallet signature until you enable instant trading again. If the key ever becomes invalid, Agonaut detects it and asks you to re enable.