Enabling a future where humans, autonomous machines, and AI agents alike are free to build, deploy, and transact with secure, self-custodial wallets.
October 17, 2025 – Tether, the largest company in the digital asset ecosystem, today announced that it has open sourced its Wallet Development Kit (WDK). This is a new development toolkit designed to help humans, machines, and AI agents build, deploy, and consume secure multi-chain self-custodial wallets. These wallets can be integrated into any device, from the smallest embedded system to mobile, desktop, or server operating systems.
Tether's WDK enables developers, organizations, nation states, AI agents, and even autonomous systems to leverage a single solution to develop secure, production-ready wallets and create cross-platform experiences by integrating wallet functionality such as DeFi, payments, savings accounts, prediction markets, gaming, chips, and more.
Self-custodial wallets are the foundation of a free and open financial system, forming the backbone of a resilient infrastructure that cannot be exploited or disrupted by centralized organizations. Open sourcing the WDK allows anyone to audit, use, contribute code, and build their own independent, secure, and permissionless white-label wallets.
“Self-custodial wallets are the cornerstone of a free and resilient financial infrastructure,” he said. Paolo Ardoino, CEO of Tether. “We envision a world where humans, autonomous machines, and AI agents have complete control over their finances. In that future, where programmable money is a social network that spans the fabric of society, WDK by Tether is the foundation of the financial backbone, a fully open source self-custody toolkit designed to be modular, independent, resilient, and infinitely scalable, enabling trillions of wallets.”
Unlike commercial wallet frameworks that charge fees or lock developers into a particular ecosystem, WDK by Tether is completely open source and ecosystem agnostic. The framework is built with flexibility at its core, allowing anyone to create a wallet that can operate across Bitcoin, Lightning Network, EVM, and non-EVM blockchains such as Ethereum, Arbitrum, Polygon, TON, and Solana. Built-in USDT0 network scaling technology ensures seamless bridging and high availability liquidity. WDK by Tether supports a wide range of DeFi primitives, from loans to swaps, along with advanced features that allow developers to create comprehensive user experiences for any use case. WDK provides customizable user interface templates and widgets that simplify the most complex aspects of wallet development, as well as stateful solutions such as secure key management, cross-chain asset transfers, messaging capabilities, real-time balance updates and transfer status tracking.
Wallets should be able to run anywhere. Tether's WDK can run and evolve on any embedded device, mobile app, desktop application, IoT device, server, or even autonomous system. From smartphones to smart refrigerators, trading bots to spaceships, WDK by Tether enables financial sovereignty in any environment. In a world where AI agents and robots become increasingly autonomous and permeate every aspect of our lives, machines need to access and self-manage their own resources. Tether's WDK will be the logical and rational preferred choice for tomorrow's digital entities, ensuring direct custody of funds, highly scalable transactions, and powering the limitless AI economy of the future.
End users benefit from a simple, intuitive experience that hides crypto complexities such as gas fees, bridge management, and network switching. At the same time, developers get a robust, modular architecture that can be easily expanded for future innovations. The upcoming Rumble Wallet and Tether's own upcoming self-custodial solutions are built entirely on WDK, demonstrating the framework's scalability, security, and adaptability.
Tether's WDK is available at https://wallet.tether.io/.
About WDK by Tether
Tether's WDK is an open source wallet development kit designed to simplify and accelerate the creation of highly secure self-custodial wallets. Built to support Bitcoin, Lightning, USDT, XAUT, and soon USAT, WDK by Tether provides a modular, ecosystem-agnostic infrastructure that can be expanded to support any blockchain or digital asset.
With built-in USDT0 technology, DeFi primitives, and cross-chain interoperability, WDK enables developers, institutions, and even sovereign nations to build independent white-label wallets without relying on centralized providers. It provides the foundation for a future where humans, connected devices, and AI agents can securely store and exchange value across open networks. WDK by Tether is available for free at https://wallet.tether.io with no fees or restrictions.
