I have a question. Can someone from the United States buy a MostWam tv subscription? And if so, how can I pay?

you should be able to. for me it converted to pounds automatically

I can personally confirm that you can get a MostWam subscription in the US.

I can't address that specifically, but I have bought international content before and subscriptions to sites in other countries. Your credit card, or the billing company, should handle the conversion seamlessly. Just be aware that a credit card might charge you a conversion fee (which is actually pretty negligible) and monthly fees might fluctuate due to exchange rate changes.

I'm in the US and I have one. Would highly recommend.