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Re:WePay Drops Prices, Rolls Out White Label Payments API by barake on Tuesday August 14, 2012 @12:39PM (#4381785)
Paypal, Amazon and WePay are the only solutions I've found for marketplace-style payments.
Re:WePay Drops Prices, Rolls Out White Label Payments API by DASD on Tuesday August 14, 2012 @12:48PM (#4381828)
Is Paypal considered a marketplace-style payment system?

Two other newcomers are BalancedPayments.com (Gittip.com which has been getting some attention on HN is using them now) and BancBox.com . I have not used either but they are on a shortlist for a project I'm working on.