you increase your odds of selling with 2 words by a huge amount, any addition to syllables also affects the ability to market many domains. till you learn more stay away from endings in plurals or ed , er , etc.. that being said, it is kind of catchy. maybe a " outside banking " option or service.
but a buyer seeing higher price versus 8 dollars might jump at
Topside cash
Upside cash
Myside cash
.... maybe their taken, i didnt check, but you get my point.
you need to reg domains with less alternatives to succeed.
it is often in the eyes of the beholder for value, my opinion is stick to 2 word to increase your odds. ( yes technically outside is 1 word, but you get what i mean.
Good Luck !