What do you mean by "pre-pay"? AFAIK, every LP hosting plan requires you to pay the full amount due up front. E.g., if you buy a 12-month Basic hosting, it's $7.95 x 12 due before your account is activated. Do you mean that you want to pay for future hosting in advance, with a credit on your account, so that your credit card won't be billed at renewal (while you're trekking across Antartica or some such thing)? If so, I would think
billing@lunarpages.com would be the one to ask, but I'll defer to
Mitch on this one. I doubt they'll pay you any interest on the advance payments, but who knows?