# Sign in

Sign in with **X** or with a **wallet**.

## With X

Sign in with your X account, and comfy makes a wallet for you. It is the wallet that holds your tokens and pays for your trades.

To move 0G or tokens out of it, use **send** in your account menu.

## With a wallet

Connect a browser wallet, or any wallet through WalletConnect. comfy supports Ethereum-style wallets.

Your wallet must be on **0G mainnet**. If it is on another network when you sign in, comfy asks it to switch. If you decline, the site shows a **switch network** button.

## If you are signed out

If your session ends, comfy says so once, with a **sign in** button.

## You need 0G

Every trade and every claim pays a small network fee, called gas, in 0G. Keep some 0G in your wallet on top of the amount you plan to trade.

If you hold 0G on another chain, your [portfolio](../account/portfolio.md) shows it and links a bridge to 0G mainnet.

A launch can be free of gas: see [Free launches](../launch/free-launches.md).