Empowering a Future Where Humans, Autonomous Machines, and AI Agents alike can Build, Deploy, and Transact Freely Using Secure, Self-custodial Wallets

17 October 2025 – Tether, the largest company in the digital asset ecosystem, today announced it has open-sourced its Wallet Development Kit (WDK), a new development toolkit designed to empower humans, machines, and AI agents to build, deploy, and utilize secure, multi-chain, self-custodial wallets. These wallets can be integrated into any device, from the smallest embedded systems to mobile, desktop, or server operating systems.

With WDK by Tether, developers, organizations, nations, AI Agents, and even autonomous systems can create cross-platform experiences by leveraging a single solution to develop secure, production-ready wallets and integrate wallet functions such as DeFi, payments, savings accounts, prediction markets, gaming, and tipping. 

Self-custodial wallets are the foundation for a free and open financial system, forming the backbone of a resilient infrastructure that cannot be abused or disrupted by centralized entities. By open-sourcing WDK, anyone can audit, use, contribute back to the code, and build their own independent, secure, and permissionless white-label wallets. 

“Self-custodial wallets are the cornerstone of a free and resilient monetary infrastructure,” said Paolo Ardoino, CEO of Tether. “We imagine a world where humans, autonomous machines, and AI Agents have the freedom to control their own finances. In that future, where programmable money is the social network across the fabric of society, WDK by Tether is the cornerstone of the financial backbone, a fully open-source, self-custodial 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 specific ecosystems, WDK by Tether is fully open-source and ecosystem-agnostic. Built with flexibility at its core, the framework enables anyone to create wallets that can operate across Bitcoin, Lightning Network, EVM, and non-EVM blockchains, including Ethereum, Arbitrum, Polygon, TON, Solana, and more. USDT0 network-scaling technology is embedded to ensure seamless bridging and highly-available liquidity. WDK by Tether supports a wide range of DeFi primitives, from lending to swaps, alongside advanced features that allow developers to create comprehensive user experiences for any use case. WDK also offers customizable user-interface templates and widgets that simplify the most complex aspects of wallet development, as well as secure key management, cross-chain asset transfers, messaging capabilities, and stateful solutions such as real-time balance updates and transfer status tracking. 

Wallets need to run everywhere. WDK by Tether can live and evolve on any embedded device, mobile app, desktop application, IoT device, server, and even autonomous systems. From smartphones to smart fridges, from trading bots to spaceships – WDK by Tether enables financial sovereignty across all environments. In a world where AI agents and robots are becoming increasingly autonomous and will permeate every aspect of our lives, machines need to access and self-manage their own resources. WDK by Tether would be the logical, rational preferred choice for the digital entities of tomorrow, ensuring direct custody of funds, highly scalable transactions, and empowering the infinite AI economy of the future.

End-users benefit from a simple and intuitive experience that hides the complexity of crypto, including gas fees, bridge management, and network switching. At the same time, developers gain a robust and modular architecture that can be easily extended for future innovations. The soon-to-be-launched Rumble Wallet and Tether’s own upcoming self-custodial solution are built entirely on WDK, demonstrating the framework’s scalability, security, and adaptability.

WDK by Tether is available at https://wallet.tether.io/.

About WDK by Tether 

WDK by Tether is an open-source Wallet Development Kit designed to simplify and accelerate the creation of hyper-secure, self-custodial wallets. Built to support Bitcoin, Lightning, USD₮, XAU₮, and soon USA₮, WDK by Tether offers modular, ecosystem-agnostic infrastructure that can be extended to support any blockchain or digital asset.

With built-in USDT0 technology, DeFi primitives, and cross-chain interoperability, WDK empowers developers, institutions, and even sovereign nations to build independent, white-label wallets without reliance on centralized providers. It provides the foundation for a future where humans, connected devices, and AI agents can securely hold and exchange value across open networks. WDK by Tether is available for free, with no fees or restrictions, at https://wallet.tether.io