You can borrow USDT, USDC, DAI and NXUSD, depending on which region you are in. For full availability please check your Wirex App. 

NXUSD can be borrowed up to 80% LTV with 0% APR. 

USDC, USDT and DAI can be borrowed up to 60% with 2% APR. 

The borrowed amount depends on the collateral that you add and the allowed LTV ratio of it. 
 
For more information about the borrowed amount and the LTV, please check this page. 

The cryptocurrencies that can be used as collateral are BTC and ETH. 

More collateral options will be coming soon!