MPS Capital Services, a wholly owned subsidiary of Banca Monte dei Paschi di Siena S.p.A., Barclays Capital, the investment banking business of Barclays Bank plc, and LCH.Clearnet Ltd announced that MPS has signed an agreement to clear interest rate swaps on LCH.Clearnet's SwapClear service through Barclays Capital. The transaction represents the first major client clearing mandate for backloaded trades.