Tether, the largest stablecoin issuer in the world, has launched an open-source wallet development kit (WDK) that allows businesses and developers to integrate non-custodial wallets into any website or app. The WDK is designed to work with AI agents and supports both human users and new digital beings. It gives users full control over non-custodial assets and eliminates reliance on third-party custody solutions. The WDK will initially support Bitcoin and Tether but will soon expand to offer UI templates for any platform to build any non-custodial user experience.