Spamton talks about money in any case, which is why I mentioned it. Like his profile even says, he's a living incarnation of email spam. It is true that Spamton would probably take more than just a penny if that's an option, but it depends on what Andrea has on her. Spamton absorbs physical money from Kris, and Andrea said that she pays for stuff digitally, so there's a good chance that Spamton can only take the penny. Due to this factor that's completely random yet can majorly change the result of the battle, I'll still keep my vote as inconclusive.
Also, after thinking about the matchup a little more, I should clarify something; the only reason Kris can play along with Spamton asking for money is because he can win battles in Deltarune without attacking. In the case of this Spamton VS Andrea battle, perhaps Andrea would do something similar because of one of or any combination of the following: being intrigued, the lack of feeling of being in danger because of the supernatural luck, or the desire to cooperate with an attacker in an attempt to make them less hostile. It's possible that this simply won't happen, but there's still the likelihood of it happening, so like I wrote, I think inconclusive is the best vote.