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Building onchain apps has a dirty secret, the actual product idea, the thing you're excited to ship, all takes maybe 20% of your time. The other 80% goes into figuring out wallet adapters, bridge integrations, RPC endpoints, and why the same transaction behaves differently on two chains that are supposedly compatible. App Kits is Arc's answer to that problem

App Kits is a suite of SDKs that handles the three most common actions in any onchain application: bridging, swapping, and sending. Instead of stitching together separate libraries, contract calls, and third-party APIs for each one, you install a single SDK and call a method.

Each of the three core actions (Bridge, Swap, Send) is a kit you can use on its own or together. They all follow the same patterns, work with the same wallet adapters, and behave consistently across supported chains. You learn the SDK once and use it everywhere

If you've ever tried to build a crosschain bridge from scratch, you know how quickly it spirals. You need to handle token approvals, CCTP domain IDs, attestation polling, RPC reliability, chain switching, and wallet adapter differences, and that's before you write a single line of business logic. One developer documented spending six hours getting a manual CCTP implementation to a state that "technically worked but felt fragile. With Bridge Kit the same transfer is just four lines of code. The kit handles everything underneath, the burn, the attestation, the mint, without you touching any of it

 moves USDC across supported blockchains using Circle's CCTP protocol. No wrapped tokens, no liquidity pools. Native USDC burned on the source chain, native USDC minted on the destination, works across EVM chains and Solana and available as a standalone package if you need only bridging.

 handles token swaps on the same chain. You don't have to manage liquidity provider integrations or deal with third-party swap APIs directly. the kit abstracts it. You can set slippage protection and get pre-swap rate estimates before executing. Note: Swap requires a kit key from Circle Console.

 handles wallet-to-wallet token transfers on the same chain with the same adapters as the rest of the SDK

This is the part that doesn't get talked about enough. App Kits has built-in fee collection. You can configure a fee on any bridge, swap, or send transaction directly in the SDK call. No separate fee contracts to deploy and no custom smart contract logic to write.

If you're building a DEX aggregator, a payment app, or anything where value flows through your product you can capture a percentage of that flow without building the infrastructure for it from scratch. The monetization is baked into the transaction itself.

 building anything that moves USDC across chains or between wallets, App Kits removes the part of the job that isn't your product

 of apps built on Arc, App Kits is not entirely invisible to you, it's why those apps work consistently. The bridge that doesn't fail halfway through, the swap that gives you a rate estimate before you commit, the send that works the same way regardless of what wallet you're using. That reliability comes from building on a shared, tested SDK rather than custom code every team writes differently.

This is the first App Kits release that brings multiple capabilities together under a single SDK experience. The team is expanding it with new methods and broader support over time, without changing the core workflow or compromising the developer experience. 

App Kits: Stop Writing the Same Code Over and Over Again

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