To trade Polymarket markets from Nimb, you need a self-custody wallet: MetaMask, Rabby or Coinbase Wallet in your browser, or any mobile wallet that supports WalletConnect. Creating one takes about 5 minutes. The part that matters is backing up your recovery phrase and never sharing it; Nimb will never ask for it.
A self-custody wallet is a wallet whose keys only you hold, so no company can move or freeze its funds, and no company can recover them if you lose the keys. Reading the map on Nimb needs no wallet at all; you need one only to trade. This page is step 2 of getting started.
Which wallets work with Polymarket and Nimb?
Nimb supports two ways to connect: a browser wallet (an extension that injects itself into the page) and WalletConnect (a QR code you scan with a mobile wallet). Any wallet that speaks one of these and supports Polygon should work. These are the common ones:
| Wallet | Type | Mobile | Desktop | Notes |
|---|---|---|---|---|
| MetaMask | Browser extension and app | Yes | Yes (Chrome, Firefox, Edge, Brave) | The most widely used. Polygon may need adding (see below). |
| Rabby | Browser extension and app | Yes | Yes (Chromium browsers) | Shows a preview of what each transaction does before you sign. |
| Coinbase Wallet | Browser extension and app | Yes | Yes | Self-custody, separate from a Coinbase exchange account. |
| Mobile wallets via WalletConnect | QR code link | Yes | Pairs with desktop by scanning | Use when you have no browser extension, or want keys to stay on your phone. |
A Coinbase exchange account and Coinbase Wallet are different products. Funds on an exchange are held by the exchange; to trade from Nimb you move them to a wallet you control.
Do I need a separate wallet for prediction markets?
You do not have to, but it is a good idea. A dedicated wallet that holds only what you plan to trade limits the damage if something goes wrong: a bad signature, a phishing site, a lost phone. Keep long-term savings in a different wallet, ideally a hardware wallet, and move only your trading amount across.
How do you create the wallet in 5 minutes?
- Install from the official source only. Type the wallet's address yourself (metamask.io, rabby.io, or the Coinbase Wallet page on coinbase.com) or use your browser's or phone's official store. Search ads for wallet names are a common route to fake extensions.
- Choose "Create a new wallet". Set a password. The password unlocks the wallet on this device only; it is not your backup.
- Write down the recovery phrase. The wallet shows 12 or 24 words. Write them on paper, in order, and check each one.
- Confirm the phrase. The wallet asks you to re-enter some of the words. This proves your copy is right.
- Note your address. It starts with
0xand has 42 characters. It is public: you can share it to receive funds.
What is a seed phrase and where should you keep it?
A recovery phrase (also called a seed phrase) is the list of 12 or 24 words that can rebuild your wallet, and its keys, on any device. Whoever has the words has the money. There is no password reset and no support desk that can undo a theft.
- Keep it offline. Paper or a metal backup plate, stored somewhere safe. Consider a second copy in a separate place.
- Never photograph it, screenshot it, email it, store it in a notes app, a password manager synced to the cloud, or a chat.
- Never type it into a website. A real wallet asks for the phrase only when you restore it inside the wallet app itself, and only when you started that.
- Never read it aloud on a call or show it on a screen share.
What if you lose access to your wallet?
If you lose the device but have the recovery phrase, install the wallet on a new device, choose "Import" or "Restore", and enter the words. Your address, and everything in it, comes back. Your Polymarket Deposit Wallet is tied to that address, so it comes back too. If you lose the phrase and the device, the funds are gone. Nobody, including Nimb and Polymarket, can recover them. If you think someone has seen your phrase, create a new wallet at once and move everything to it.
Does the wallet need to be on Polygon?
Yes. Polymarket runs on Polygon PoS, a blockchain compatible with Ethereum. Your address is the same on every Ethereum-compatible chain, but your wallet needs to know about Polygon to sign for it.
| Setting | Value |
|---|---|
| Network name | Polygon (Polygon PoS mainnet) |
| Chain ID | 137 |
| Gas token | POL (formerly MATIC) |
| Block explorer | polygonscan.com |
Most wallets already list Polygon. If yours does not, Nimb asks your wallet to add and switch to it when you connect; approve the pop-up and check that it says chain ID 137. Avoid adding networks from third-party sites.
POL is the token that pays network fees ("gas") on Polygon. You need a little only if you send tokens yourself from this wallet on Polygon. Setting up your Polymarket trading wallet, approvals and orders placed through Nimb are gasless.
What are the wallet safety rules?
- Nimb will never ask for your recovery phrase or private key. Not in the app, not by email, not in a direct message. Anyone who asks is trying to steal from you.
- Never share your keys with "support", a "recovery service" or anyone offering to fix a stuck deposit.
- Check the address bar. Nimb lives at nimb.markets. Bookmark it and use the bookmark. Phishing sites copy the look of real ones and are promoted through ads and social replies.
- Read every pop-up before you sign. Connecting to Nimb asks for a message signature and a gasless setup; it never asks you to send tokens to an address or to approve spending to an unknown contract. Reject anything you do not understand.
- Ignore unsolicited direct messages, airdrops of unknown tokens and "claim" links. Do not interact with tokens that appear in your wallet uninvited.
- Keep the wallet app up to date and your device locked.
- Use a dedicated wallet for trading, with only what you are prepared to lose.
What about existing Polymarket accounts?
Polymarket has used three kinds of account wallet over the years. Which one you have depends on how and when your polymarket.com account was created.
| Wallet model | Who has it | On Nimb |
|---|---|---|
| Deposit Wallet | Every Polymarket account wallet deployed on or after 4 May 2026; the default for new users | Set up for you when you connect. No polymarket.com sign-up needed. |
| Proxy Wallet (legacy) | Accounts created on polymarket.com with email (Magic Link) or Google | Not connectable with an external wallet at launch. |
| Safe Wallet (legacy) | Older accounts created with MetaMask, Rabby or another external wallet | Connect the same wallet; Nimb should find your existing Safe. |
Can you use a Polymarket email (Magic) account instead?
Not directly. An email or Google account on polymarket.com has no browser wallet to connect. The simplest route is to create a self-custody wallet as above and use it with Nimb, keeping your polymarket.com account separate. You can withdraw funds from polymarket.com to the new wallet's address on Polygon if you want to move money across.
If you already use polymarket.com with MetaMask or Rabby and have a Deposit Wallet there, connecting the same address on Nimb is expected to reach the same Deposit Wallet, with the same balance and positions, because its address is derived from your signing address.
What comes after the wallet?
With a wallet set up and the recovery phrase on paper, the next step is getting USDC onto Polygon. Read how to fund your wallet with USDC on Polygon, then connect your wallet to Nimb. Prediction markets are risky and you can lose your whole stake; read the risks before you trade.
Last reviewed 2026-11-07 · Data from Polymarket · Not financial advice · Nimb is not affiliated with Polymarket.