Do you have to pay for a router monthly?

Excuse me, I'm a bit confused about the costs associated with owning a router. Could you please clarify whether or not one has to pay a monthly fee for a router? I've heard some conflicting information and I'm trying to understand the true cost of maintaining a router in my home or office. Is the cost simply the initial purchase price, or are there ongoing monthly charges that I should be aware of? Your insights would be greatly appreciated.