TL;DR: LI.FI is now integrated in the Wallet Development Kit (WDK) by Tether, giving a developers an easy integration to add swaps and cross-chain functionality to their wallets and applications, built with WDK.

Introduction

Wallets are no longer just places to hold digital assets. Users increasingly expect to manage, swap, and move assets across networks from the same application, without needing to navigate a fragmented set of external services.

For developers, delivering that experience creates a much larger infrastructure challenge. Supporting multiple blockchains already means working across different account models, transaction formats, fee systems, and development environments. Adding swaps and cross-chain functionality introduces another layer of integrations, liquidity sources, and ongoing maintenance.

Tether created its Wallet Development Kit (WDK) to simplify how developers build self-custodial wallets and applications, and is now integrating LI.FI in the toolkit to make swap and cross-chain functionality easier to add.

Bringing LI.FI to Tether WDK

WDK gives developers modular, open-source building blocks for creating self-custodial wallets and applications across multiple blockchain ecosystems. Users retain control of their assets, while teams can bring wallet functionality to consumer apps, payment services, enterprise products, connected devices, and AI agents.

Its modular architecture allows developers to choose the networks, providers, and features that fit their needs. Wallet and protocol modules can add functionality such as swaps, bridges, lending, and fiat access without relying on closed wallet infrastructure.

As part of the collaboration, LI.FI has been integrated into WDK through its Swidge framework—the common interface WDK uses for swaps, bridges, and experiences that combine both.

With LI.FI now available through WDK, developers can connect WDK-based wallets and applications to LI.FI's universal liquidity layer. Instead of building and maintaining separate connections for each onchain venue, teams can access swap and cross-chain functionality through one reusable module.

Bringing LI.FI into WDK preserves the principles behind the toolkit. WDK continues to provide the open, self-custodial wallet foundation, while LI.FI handles the complexity involved in finding and executing available onchain routes. Developers remain free to choose the modules and providers that make sense for their products.

The developer journey is designed to remain straightforward:

1. A team builds a self-custodial wallet or wallet-enabled application with WDK.

2. The team adds LI.FI through WDK to offer swap and cross-chain functionality.

3. Users access those features inside the resulting wallet experience, while LI.FI manages the underlying routing complexity.

What This Enables

For developers, adding LI.FI to WDK provides a faster path to building more feature-rich wallet experiences. Teams can add swaps and cross-chain asset movement without independently connecting to and maintaining every underlying liquidity source.

That reduces the amount of infrastructure required to launch and expand a multi-chain product. It also allows developers to spend more time on the parts of the experience that differentiate their application: interface design, onboarding, security, and the needs of their users.

For the WDK ecosystem, Tether’s collaboration with LI.FI demonstrates how external providers can expand the toolkit without compromising its modular design. New functionality can be added through compatible modules while WDK remains open and provider-agnostic.

The result is a more flexible foundation for the next generation of wallets and wallet-enabled applications: self-custodial by design, modular for developers, and better connected across the onchain economy.

Start Building

LI.FI is now available to WDK developers through a dedicated open-source module.

• LI.FI WDK module: github.com/lifinance/wdk-lifi-swidge-protocol

• npm package: @lifi/wdk-protocol-swidge-lifi

• WDK documentation: docs.wdk.tether.io

About WDK by Tether

The Wallet Development Kit by Tether (WDK) is an open-source toolkit for building secure, multi-chain, self-custodial wallets for humans, businesses, machines, and AI agents. Its modular architecture gives developers common building blocks for wallet operations, protocol integrations, blockchain data, and user experiences across mobile, server, and embedded environments.

Documentation: docs.wdk.tether.io

GitHub: github.com/tetherto

About LI.FI

LI.FI is the universal liquidity layer trusted by 1,000+ enterprises to unlock unified market access to digital assets. LI.FI educes the complexity of building digital asset products by orchestrating liquidity across permissioned and permissionless venues, powering stablecoin and RWA flows across 60+ chains through a single integration.

Build with LI.FII: docs.li.fi