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We study the impact of the recent global financial crisis on CHAPS, the United Kingdoms large-value payments system. Core infrastructures functioned smoothly throughout the crisis and settlement banks continued to meet their payment obligations. However, payments data show that in the two months following the Lehman Brothers failure, banks did, on average, make payments at a slower pace than before the failure. We show that this slowdown is related to concerns about counterparty default risk, thereby identifying a new channel through which counterparty risk manifests itself in financial markets.