Summary
Stop writing custom code from scratch for every wallet, chain, or new feature you want to support for your app. App Kits simplifies how you build onchain apps, allowing developers to integrate USDC-powered bridge, swap, and send functionality. With unified SDKs and developer tooling, App Kits abstracts away complexity so builders can focus on shipping scalable and interoperable onchain solutions.
Building onchain applications should be straightforward. Moving value across chains, enabling swaps, or supporting multiple wallets should not require weeks of custom integration work.
But the reality is that supporting even basic actions like bridging, swapping, or sending tokens means stitching together multiple APIs, RPC endpoints, smart contracts, liquidity providers, and wallet adapters. Every chain introduces new edge cases. Every wallet requires different handling. Monetization requires custom contracts and audits. The result is a fragmented developer experience that increases integration risk, slows time to production, and diverts engineering effort away from building differentiated product experiences.
Today, we’re introducing App Kits: a suite of curated developer SDKs that unify how teams build with core onchain primitives like bridging, sending, and swapping. Each method can be implemented in under 10 lines of code, with production-ready patterns and tutorials to get from prototype to deployment faster. By abstracting away crosschain and cross-wallet complexity behind a consistent SDK interface, App Kits enables developers to build once and ship across supported environments without rewriting code.
One interface to abstract onchain complexities
App Kits turns complex integrations into simple, reusable SDK methods — each of which can be implemented in fewer than 10 lines of code. Instead of writing bespoke logic for every chain, wallet, or liquidity provider, developers can rely on consistent primitives for the most common onchain actions.
The initial App Kits release supports three core methods:
Bridge
Bridge Kit enables users to move USDC across supported chains using Circle CCTP. Future iterations aim to expand support to additional stablecoins and chains, while preserving the same seamless experience.
Swap
The Swap SDK abstracts away complexity so developers don’t have to manage routing, liquidity sourcing, or provider integrations. Asset and provider support will expand over time without requiring developers to rewrite integrations.
Send
Transfer stablecoins on the same chain through the same SDK interface.
Each method is complemented by runnable sample applications and prescriptive tutorials that demonstrate complete, end-to-end flows. Rather than offering isolated snippets, App Kits provides production-ready patterns designed to reduce ambiguity and shorten the path from prototype to deployment.
Circle-optimized, open by design
App Kits is optimized for Circle infrastructure — including USDC, CCTP, and Circle Wallets — while remaining flexible and extensible.
With App Kits, developers can:
- Bring their own RPC endpoints
- User their preferred framework (e.g., viem or ethers)
- Use Circle Wallets or third-party wallets
This backend-agnostic approach provides consistency without ecosystem lock-in.
Monetization built in
Unlike most developer toolkits, App Kits includes a built-in monetization mechanism. Developers can configure revenue-sharing directly within supported transaction flows, without deploying separate contracts or managing fee logic independently.
By integrating monetization logic directly into transaction flows, developers can activate revenue generation without deploying separate contract systems or writing custom fee logic from scratch. This reduces implementation overhead while enabling sustainable business models from day one.
Designed for builders and infrastructure providers
App Kits is built for stablecoin application developers, fintech teams, crypto infrastructure providers, and crosschain product builders who need to ship real fund flows without prolonged integration cycles. By standardizing how core onchain actions are implemented, App Kits shortens time to market for teams while accelerating integration of Circle products like CCTP and Wallets.
It establishes a consistent development model for bridging, swapping, and more — reducing integration complexities to start supporting the foundational actions behind stablecoin-powered applications.
What’s next
This is the first App Kits release that brings multiple capabilities together under a single, seamless SDK experience. We’ll keep expanding the SDK with new methods and broader support over time, without changing the core workflow or compromising the developer experience. We’re actively incorporating developer feedback as we go.
App Kits is the foundation for teams building onchain, enabling faster integration today, and built to scale and expand tomorrow.
App Kits is free and permissionless, and you can start with App Kits today.
Explore the quickstart guide, and start integrating Send, Bridge, or Swap in minutes.