Brokers

Polymarket

Connect a Polymarket wallet to bet on real-world events: what it supports, how to prepare your keys, how to connect it in the app, and how to fix common problems.

Polymarket is a prediction market that runs on Polygon and settles in USDC. You bet on real-world events, and TradeLabs connects to it with a wallet rather than a username and password.

What it trades	Supported
Prediction markets (settled in USDC)	Yes
RSA, stocks, options, spreads	No

Note

Polymarket is one wallet per person in the app. You connect it with a private key, not a login, so there is no 2FA and no captcha.

Before you start

A funded Polygon wallet holding USDC on the Polygon network.
The private key for that wallet’s EOA (externally owned account). This is the Polygon key the app signs orders with.
Optionally, a separate funder wallet that holds your USDC, if you keep your trading key and your balance in different wallets.
The TradeLabs Companion installed and running.

Heads up

Your private key controls the funds in that wallet. Use a wallet you have set aside for this, keep only what you plan to trade in it, and never paste a key you use for anything valuable. The app stores the key encrypted through your operating system keychain.

Connect it in the app

Open the Brokers page, find the Polymarket card, and click Add account.
Fill in the connect form, then click Save account. Your key is encrypted on your device.

The Brokers page in the app Click a broker card, then Add account, to open the connect form

The Polymarket connect form Paste your Polygon wallet private key; the funder and EOA addresses are optional and derive from the key

The connect form has these fields:

Private key — the Polygon EOA private key, pasted in (starts with 0x). Stored encrypted via your OS keychain.
Funder address — optional. The USDC funder wallet, if your balance lives in a wallet separate from your trading key. Leave it blank to use the trading wallet itself.
EOA address — read-only. The app derives this from your private key and fills it in for you, so you can copy it.

Click Sign in on the account row. There is no code to enter and no captcha. The app checks the wallet and the row switches to a signed-in state.

When it connects you see a Polymarket signed in confirmation.

Tip

If you route through a proxy, set the proxy on the account when you add it. Polymarket does not require one.

Fixing common problems

Sign-in fails: confirm the private key is correct and complete (a full 0x key, no spaces). A wrong or truncated key cannot sign orders.
EOA address looks wrong: the read-only address is derived straight from the private key. If it is not the wallet you expect, you pasted the wrong key.
Trades do not fill: check that the wallet (or the funder wallet, if you set one) holds enough USDC on the Polygon network, and that USDC is on Polygon rather than another chain.
Balance is in another wallet: put that wallet in the Funder address field so the app knows where the USDC lives.