What is the best online payment service for a middleman?

[Willie Belieu]

I want to start a middleman service and I'll have to deal with money(online). What service is the cheapest to use. I will need to hold the money from client B(buyer) until I can validate the items of client A(seller) and then I release the money to client A. My business is not US based and I will work with people from all around the world. What is the service for online money transfer with lowest or no fees involved for cross-country payments?

Thank you


i am too stupid and lazy to get a real job.