Exchange giant NYSE Euronext has pledged to support its largest clients by capping fees for a clearing service it plans to launch with LCH.Clearnet, while simultaneously opposing a bid by the same customers to buy Europe's largest central counterparty .

NYSE Euronext, which yesterday received regulatory approval for a new European futures clearing service in partnership with Anglo-French central counterparty LCH.Clearnet, said it will freeze clearing fees after its launch on July 27 this year.