August 14, 2025 – Tether, LightSpark, the largest company in the digital asset industry and a decentralized financial innovation company, has announced the integration of Spark’s cutting-edge Bitcoin Lightning infrastructure into the Open Source Wallet Development Kit (WDK). This integration marks a major advance in the evolution of programmable, self-supporting wallets, providing developers with an easy way to incorporate fast, low-cost Bitcoin payments into their wallet products via a single stateless API.
WDK is an open source modular software development kit designed to allow businesses and developers to seamlessly integrate non-mandatory wallets and user experiences of USD, Xau₮, Bitcoin (and virtually other tokens) to ensure apps, websites, devices, security, revival and flexibility. The toolkit will soon be fully open-sole, expanding its accessibility further and fostering community-driven innovation. Spark’s integration into WDK allows builders to launch wallets that support native Bitcoin L1, Spark, and Lightning features, thereby removing the complexity and tradeoffs that are usually associated with building user-friendly, independent wallets. Developers can also integrate instant Bitcoin and Stablecoin transactions into any application, via mobile, desktop, web and embedded devices, without relying on custody infrastructure or cloud services.
Lightspark’s Bitcoin Lightning Infrastructure provides the tools companies need to modernize payments, integrate with existing systems, and unlock new possibilities. This is in line with Tether’s broader vision for a financial system that prioritizes privacy and unauthorized innovation. It also strengthens Tether’s commitment to supporting both users and emerging AI-driven systems by equipping robust and non-mandatory tools for seamless value transfer.
Tether CEO Paolo Aldoino; “With Spark’s integration into WDK, we are not only enhancing our technology, but also ignite a financial revolution. With this advancement, this advance will allow us to develop a programmable and resilient financial system that will serve individuals, machines and diverse communities. A comprehensive financial future.”
Tether’s WDK has emerged as a powerful tool for developers building the next wave of open financial infrastructure. The ability to serve both humans and developers is very suitable for an era defined by artificial intelligence, automation, and decentralized ownership. The integration also provides a way for WDK to support the recently announced distributed AI agent platform by Tether, an autonomous agent within the QVAC ecosystem.
“Tether is not only the most successful stubcoin company in the world, but also the largest Bitcoin company in the Stablecoin space. WDK is extremely excited about WDK’s Bitcoin fast, cheap, real-time Bitcoin on Spark. David Marcus, CEO and co-founder of Lightspark.
As financial innovation accelerates, Tether continues to provide the basic components needed to build decentralized, unauthorized systems. By combining WDK’s scalability with Spark’s Lightning payments capabilities, Tether aims to provide a secure, scalable financial experience that works both online and offline, on earth, anywhere in orbit.
For more information about Tether’s WDK, please visit wallet.tether.io
