How to get sUSD
Explains why Kwenta uses and why traders need sUSD to utilize Kwenta

Why do I need sUSD?

Kwenta quotes its asset prices against sUSD. Traders that want to purchase synthetic assets, open a Futures position, or leverage any of the financial tools provided by Kwenta will need to do so in sUSD.
Supporting sUSD helps Kwenta stay true to its decentralized ethos. sUSD is a fully decentralized stablecoin minted by Synthetix, a decentralized liquidity protocol. sUSD, because of its decentralized issuance, cannot be muted, blocked, or stopped.

Getting sUSD on Optimistic Ethereum

In order to be able to get (swap) sUSD on Optimism you must have already bridged eligible ERC-20 tokens via a bridge. A tutorial how to use bridges can be found here.
First, head over to Uniswap.
Uniswap Screen
Connect your web3 wallet to Uniswap and make sure the Optimistic Ethereum network in your wallet is selected.
Swap from any supported ERC-20 token to sUSD
Remember to always keep some ETH in your wallet to pay for transaction fees
Swap Interface for Uniswap
You now have sUSD to trade on Kwenta.