# How to SWAP GAU<>USDT and MATIC<>USDT in GAUGECASH Wallet App
**REMINDER:** GAUGECASH is a **FREE** service, but you need Matic for gas spending. Every transaction with/from/to your **GAUGECASH Wallet** must be on the **POLYGON Network**. Please be aware of this. Transacting on a different network will lead to the loss of your tokens.
**1.-** Open the GAUGECASH Wallet app. > Sign in.
**2.-** Click on Swap.
**3.-** Choose the swap pair:
* MATIC for USDT
* USDT for GAU
**NOTE:** Both pairs work in swapping ways. Click hereto change the swap way.
**5.-** Type the amount you want to swap.
6.- Click on GET
**7.-** Congratulations! You swapped crypto, paying **CERO FEES**, just Polygon network's gas.
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to change the swap way.
**5.-** Type the amount you want to swap.
