ABSTRACT A new sociology of money has emerged over the past three decades. Unlike conventional accounts, it is attentive to the social conditions of money-making and circulation: social relationships, authority, and impersonal trust. Yet, the problem of how money is at once ‘special’ – invested with meaning, personalized, and often physically earmarked in everyday transactions – and generalized, used across social boundaries, remains unsolved. Building on the anthropology of law and the economization perspective, I bridge this gap by focusing on the processes by which money is economized through security devices, mechanisms that enable the exchange of money by sustaining a credit relationship when connections between lender and borrower are insufficient, inadequate, or altogether absent. As they make such transactions possible, security devices create new interdependencies, which become visible once the promise is broken and the guarantee that was pledged as security is repossessed. Understanding the regulation of security devices, therefore, yields new insights into the nature of money, as the legal remedies in place to deal with failure implicate monetary authorities in a politics of redress, through which what counts as collateral, under what conditions, and with what penalties, gets redefined and connected to broader financial and political processes of monetary creation.