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The App Kit SDK includes the Swap capability that lets you swap two tokens on the same blockchain in a few lines of code. It supports many stablecoins (including USDC, EURC, USDT, USDe, DAI, and PYUSD) and native tokens on supported blockchains. You need a (free) kit key from the Circle Console to use Swap.
Among testnets, only Arc Testnet supports Swap (USDC, EURC, and cirBTC only). Use mainnet for Swap on any other blockchains.

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Quick look

This example swaps USDC for EURC in a single method call:
TypeScript
// Swap 1.00 USDC for EURC on Arc Testnet
const result = await kit.swap({
  from: { adapter: viemAdapter, chain: "Arc_Testnet" },
  tokenIn: "USDC",
  tokenOut: "EURC",
  amountIn: "1.00",
  config: {
    kitKey: process.env.KIT_KEY as string, // Your kit key from the Circle Console
  },
});
For a complete end-to-end flow, follow the quickstart: Swap Tokens on a Blockchain.

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Installation

Install the App Kit SDK to use Swap. If you only need to swap and don’t want to install the full App Kit SDK, install the standalone Swap Kit for your preferred adapter below. 
npm install @circle-fin/swap-kit @circle-fin/adapter-viem-v2 viem