WDK x Spark: A New Way to Build Bitcoin Wallets

Most wallets today force a tradeoff between user experience and self-custody. Developers are faced with the choice between simplicity and control. The result is slow onboarding, fragmented flows, and users who never reach the finish line.

That needs to change.

Tether's Wallet Development Kit and Spark are coming together to fix it. Starting today, Spark is integrated directly into WDK. Builders can now create production-ready wallets with native support for Lightning, Bitcoin, stablecoins, and more through a single, stateless API.

Leadership Perspectives

Paolo Ardoino, CEO of Tether, stated: "The future is unpredictable chaos, instability, or prosperity. But with WDK and Spark, we can build programmable, resilient monetary systems that serve people, machines, and communities alike. This integration makes Bitcoin Lightning truly accessible, enabling instant global transactions without compromising custody or privacy."

David Marcus, CEO & Co-founder of Lightspark, noted: "Tether has built something truly aligned with Bitcoin's ethos. By bringing Spark to WDK, we are giving developers an easy path to embed Lightning directly into the apps people already use."

Key Capabilities

WDK is purpose-built for developers, providing teams with full control over the wallet layer without managing infrastructure or handling sensitive data. No custodial risks. No secrets stored. Just clean, extensible wallet tooling that works across chains.

Now with Spark, developers can:

• Launch Bitcoin Lightning native wallets with full ownership of keys and flows
• Power instant Bitcoin and stablecoin payments with low fees and global reach
• Build apps where the wallet experience disappears into the background

About Tether

Tether is a pioneer in stablecoin technology, aiming to revolutionize the global financial landscape and provide accessible, secure, and efficient financial infrastructure. As the creator of the industry's largest, most transparent, and liquid stablecoin, Tether is committed to developing sustainable and resilient infrastructure that benefits underserved communities.