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I spent a week going through the Arc App Kit docs and built a full DApp covering Send, Bridge, Swap, and liquidity pool flows — then deployed it on Vercel. Here's what worked, what surprised me, and the code patterns I ended up with.

A Next.js 15 App Router DApp with four pages, each backed by a 

 that calls the Circle App Kit SDK. The private key never touches the client — all signing happens server-side.

Bridge CCTP cross-chain with fee estimate

Swap - USDC <-> EURC + slippage / gas settings

Pool - Create pool, add / remove liquidity

The key insight with Next.js App Router is that Server Actions are the right place to call App Kit — the private key stays on the server, the client just sends form data and displays the result.

const adapter = createViemAdapterFromPrivateKey({

  from: { adapter, chain: "Arc_Testnet" },

. Each flow is under 20 lines of SDK code — the SDK handles approve, burn, relay, and mint automatically.

• Bridge result includes a steps array — each step (approve → burn → mint) has its own txHash and explorerUrl. Worth surfacing all of them to users so they can track the full CCTP flow.

• Swap requires a Kit Key — free from Circle Console, but it's a separate credential from your wallet private key. Easy to miss if you go straight to kit.swap() without reading the Swap quickstart.

• Blockscout API v2 on Arc Testnet (testnet.arcscan.app/api/v2/tokens/{address}) returns symbol, name, and verification status. Built a token selector that calls this when you paste a custom contract address.

• Vercel env vars — add PRIVATE_KEY and KIT_KEY in Settings → Environment Variables before deploying. They stay server-side and are never exposed to the client.

Here are some pictures after deploying on Vercel:

I’m planning to build a web app that connects to MetaMask or Rabby and focuses on improving UX/UI.

Install the App Kit core package and your preferred adapter to start building apps

Install App Kit - Arc Docs

Use App Kit to send tokens from one wallet to another on the same blockchain

Quickstart: Send tokens across wallets on the same blockchain - Arc Docs

Use App Kit to bridge tokens between blockchains using the Viem, Solana, or Circle Wallets adapter

Quickstart: Bridge tokens across blockchains - Arc Docs

Use App Kit to swap one token for another on the same blockchain

Quickstart: Swap tokens on a blockchain - Arc Docs

Building a Send / Bridge / Swap DApp on Arc Testnet with Circle App Kit

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