How much is Polygon service fee?

Excuse me, could you please clarify the cost structure associated with the Polygon service? Specifically, I'm interested in understanding the service fee that is charged for utilizing the platform. Is there a flat rate, or does it vary based on factors such as transaction size or frequency? Additionally, are there any hidden fees or charges that I should be aware of? I'm eager to gain a comprehensive understanding of the financial implications before proceeding with my transactions. Thank you for your assistance.