What is the best online payment service for a middleman? -

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

Alertpay is a great site...Check it outhttps://www.alertpay.com/?63vmGZovUIKik%2bOljd8gkQ%3d%3d

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