Install the App Kit SDK

Installing the App Kit SDK gives you every capability (Send, Bridge, Swap, and Unified Balance) in a single package. To get started, install the latest version and the adapter that fits your environment.

A kit key from Circle Console is optional for Swap but recommended for production. Without one, swap requests run against a rate limit. Configure a kit key if you hit rate limit errors or expect high request volume.

Install the core package

npm install @circle-fin/app-kit

yarn add @circle-fin/app-kit

Need a lighter install? Individual App Kits are available

The App Kit SDK includes every capability in a single package. Or, install kits individually:

## Bridge Kit
npm install @circle-fin/bridge-kit

## Swap Kit
npm install @circle-fin/swap-kit

## Unified Balance Kit
npm install @circle-fin/unified-balance-kit

## Bridge Kit
yarn add @circle-fin/bridge-kit

## Swap Kit
yarn add @circle-fin/swap-kit

## Unified Balance Kit
yarn add @circle-fin/unified-balance-kit

Install your preferred adapter

Viem
Ethers
Solana
Circle Wallets

npm install @circle-fin/adapter-viem-v2 viem

yarn add @circle-fin/adapter-viem-v2 viem

npm install @circle-fin/adapter-ethers-v6 ethers

yarn add @circle-fin/adapter-ethers-v6 ethers

npm install @circle-fin/adapter-solana-kit @solana/kit @solana/web3.js

yarn add @circle-fin/adapter-solana-kit @solana/kit @solana/web3.js

If bridging, you should also install an EVM adapter (Viem or Ethers).

For the Bridge tokens across blockchains quickstart and adapter setup examples, the same adapter is used with @solana/kit and @solana/web3.js.

server-side onlyIf you have a Circle Wallets account, you can use the Circle Wallets adapter to connect to developer-controlled wallets and Circle Contracts.

npm install @circle-fin/adapter-circle-wallets

yarn add @circle-fin/adapter-circle-wallets

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