I replied to his message just out of curiosity. Because I wanted to see it till the last step. But unfortunately I couldn't proceed further because he asked me to invest. Still, I wanted to know about the next step from him.
He's offering arbitrage calls. But you can actually do it on your own. I don't think it's still an attractive or even profitable thing these days, but you don't have to entertain a stranger who's asking for a share of the profit if you really want to learn more about it. You can actually make your own research. You can proceed with a trial with a little amount.
If you're truly curious, take time to do some research. Take time to look for resources online. If you're lazy, you might fall to these scammers. Read about arbitrage trading.