On WunderTrading, you can buy assets on one exchange and sell them on another exchange using the Spreads and Arbitrage feature.
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To do this, you need to go to the Terminal tab and select Spreads & Arbitrage as Strategy Type. Then you need to select exchanges and API for Base Exchange (where assets will be bought) and Quote Exchange (where assets will be sold).
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After that, select Base pair (pair you would like to buy) and Select Quote pair (pair you would like to sell). This is shown in the following screenshot:

After that, you need to set up all the remaining parameters of your strategy: Order type, Price, Portfolio size, etc.

That's it! Now you can create a Spreads and Arbitrage strategy and trade across different exchanges.