Introducing Bridge Kit: Build Crosschain Apps Faster

Stablecoins have become a cornerstone of onchain innovation. As builders create richer, more connected experiences, developing across blockchains has become essential – so that value moves seamlessly and without friction. Stablecoins like USDC make this possible, serving as a trusted value layer that powers payments, DeFi, and digital commerce across ecosystems. 

At Circle, we’ve made crosschain movement seamless with CCTP (Cross-Chain Transfer Protocol), which enables secure USDC transfers with 1:1 capital efficiency. As the pace of innovation accelerates, developers need faster, easier ways to bring these capabilities to their apps. That’s why we’re taking the next step to make building with CCTP even faster.

Today we're introducing Bridge Kit, a developer toolkit that simplifies integrating crosschain transfers, starting with CCTP and USDC. Bridge Kit packages CCTP V2’s core functionality into concise SDK methods, complete with step-by-step documentation, production-ready sample code, and built-in monetization logic so developers can earn from every transfer.

Whether you’re upgrading an existing integration or building new apps, Bridge Kit can help you go from prototype to production in record time.

Built for Developers

Bridge Kit starts with USDC support through CCTP V2, giving developers a foundation for secure, permissionless crosschain transfers.

By exposing key CCTP operations as high-level SDK methods, Bridge Kit abstracts routine setup steps and standardizes bridging flows, enabling developers to go from setup to production in days, not weeks. The result: more time spent on building great user experiences and business logic to make your app stand out. 

Whether you’re moving funds between chains to rebalance liquidity pools or process crosschain payments, Bridge Kit provides a production-ready foundation built for scale:

• Fast, intuitive integration: Bridge Kit takes the heavy lifting out of crosschain USDC transfers so developers can integrate it in under ten lines of code.
• Built-in monetization support: Integrate monetization logic directly into your app to earn from every transfer.
• Flexible setup: Configure transfer speed, RPC endpoints, and blockchain interfaces (Viem and Ethers) to better support your current stack.
• End-to-end reference implementation: Explore detailed documentation, sample code, and tutorials that remove guesswork and speed up development.

This example shows how to use Bridge Kit to transfer USDC between an EVM and non-EVM chain in a single method call:

// Transfer 10 USDC from Ethereum to Solana
const result = await kit.bridge({
  from: { adapter: viemAdapter, chain: "Ethereum" },
  to: { adapter: solanaAdapter, chain: "Solana" },
  amount: "10",
});

What’s Next: Circle’s Vision for the Ideal DevEx

We believe that the global economy moving onchain is inevitable, and we’re building the foundational tools for developers to help us get there faster.

Bridge Kit is the first in a new suite of app kits designed to make it easier to build with all widely used stablecoins. Each kit offers a consistent, intuitive developer experience that minimizes learning curves and implementation friction. Together, these kits will provide a complete framework for onchain app development, making it simple to integrate core stablecoin functions like bridge, swap, and pay. Stay tuned for more to come this year. 

Start Building Today

Bridge Kit is available now: open access, no sign-up required.
Explore the docs and start building crosschain USDC experiences in minutes.

Questions or ideas to share? Join the conversation on Discord.