The rich scholarship on the politics and finance of sovereign debt tends to take for granted debt’s most basic form: as a private contract. Nevertheless, legal challenges have been central to the contemporary evolution of sovereign debt dynamics thanks to litigating strategies rendered possible by — mostly standard — contractual stipulations in international sovereign bonds. By using a debt-as-private-contract lens, the paper highlights how exposed sovereign debtors present themselves to these global transactions, how foreign sovereign bond contracts anchor otherwise footloose finance in particular jurisdictions, and how contractual changes sparked by outlier cases of protracted litigation or recent turbulence in debt exchanges have been key to global efforts to reform debt governance around market-based parameters. The legal battle between Argentina and its holdout creditors in US courts is analyzed here to illustrate these dynamics given its significance in sparking contractual revisions. Ultimately, it is clear that credit and contract are inextricably linked. Contractual evolution is revealing of the legal risks taken on by sovereign debtors and their creditors in private markets. The cost of debt hence may go beyond relatively predictable financial calculations.