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Polymarket orders do not use your main wallet. They draw on a separate Polymarket deposit wallet that belongs to your account, and it accepts one thing only: pUSD on Polygon. Get that right and funding takes a couple of minutes.

Find your Polymarket deposit address

1

Open the Deposit sheet

Click Deposit in the top bar, then Deposit under your wallet total.
2

Choose the Polymarket tab

The sheet shows your Polymarket deposit address, a QR code and the line “Send pUSD on this network: Polygon”.
3

Copy the address

Use the copy button rather than retyping it. You can also ask the chat “What is my Polymarket deposit address?”.
Deposit sheet on the Polymarket tab with a QR code, the Polymarket deposit address and the note Send only pUSD on Polygon

The Polymarket tab of the Deposit sheet

If the tab says “Set up your agent first to get a Polymarket deposit address”, your account key is still being created, which happens on its own right after sign-up. Close the sheet and open it again in a moment; External AI shows the key once it is ready.

Fund it

There are two ways in, depending on where your money is now.
Send pUSD on Polygon to the Polymarket deposit address. Nothing else: not USDC on another chain, not USDT. Funds on the wrong network or token cannot be recovered.

Check it arrived

Ask “What is my Polymarket balance?”. The agent reports what is ready to trade in your deposit wallet. Then head to Polymarket to place your first order.
Chat reply showing the Polymarket deposit wallet balance in pUSD

The agent confirms what is ready to trade

The first time you open External AI, a one-time notice reminds you to send only pUSD to Polymarket. It is the same rule as above, shown once so it sticks.

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