How much does music glue charge?

Excuse me, I'm a bit confused about the pricing structure for Music Glue. Could you possibly enlighten me on how much does Music Glue typically charge for its services? Is there a standard fee, or does it vary depending on factors such as the size of the artist's following, the number of tracks uploaded, or the level of promotion required? I'm keen to understand the cost implications before I make any commitments. Your insights would be greatly appreciated.