In the post-9/11 era, Washington has waged innovative campaigns against terrorism finance, sanctions evasion, and money laundering. Leveraging America’s heavyweight status in the international financial system, the United States Treasury has isolated and bankrupted rogue regimes, global terrorists, and their enablers. As financial technology transforms global business, the traditional financial system faces new competition across a suite of offerings, ranging from brokerage services to peer to peer lending. In no area is this clearer than in mobile payments, where a global hegemon lies ready to exercise its weight, and it is not the United States.