# 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.

*Source: https://tradelabs.org/docs/reference/brokers/polymarket*

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

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

![The Brokers page in the app](/docs-assets/app-brokers.png)
*Click a broker card, then Add account, to open the connect form*

![The Polymarket connect form](/docs-assets/brokers-connect-polymarket.png)
*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.

3. 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.