An Escrow like system

Hi everyone, I just founded a startup (Web presence and mobile app yet to be built) that involves the transaction of money between two parties. To be able to build a system both parties can trust, I need to integrate a system like Escrow that receives and holds money for a certain period of time.

However integrating Escrow costs a lot (I heard they charge 3.25% for non USA residents which is too high. Now I want advice if there’s an alternative system I can use our just any other way my clients can trust me with their money until transaction is completed.

Thank you.