It actually depends on your personal path. There are a few deities and entities you could work with who require some kind of "payment". Mostly this takes the form of an offering in equal amount to what you are asking of them. For example, doing community service or pouring out a glass of wine into the earth. It varies from path to path.
But if you mean do you have to pay a price for just casting a spell, then no. I've never seen or heard of anything like that in real life. That's generally a fiction invented for drama, like in Darker than Black and a LOT of other anime & manga series, not to mention movies and TV.