Track 8 · Capstones · lesson 1

Send test ETH between wallets

30 min

The capstones are yours to build, on your own machine, with the Foundry and frontend setup from track 6. Seven of them, and the help shrinks as you go — this first one hands you almost everything.

The build

A page that sends testnet ETH from your wallet to any address you type, and shows the transaction through to confirmation.

No contract at all — this is pure frontend, on purpose. It proves the wallet → transaction → receipt loop end to end before you add contracts on top.

Starter layout

send-eth/
├── src/
│   ├── App.tsx          // TODO: layout + connect button
│   ├── wagmi.ts         // TODO: config for Sepolia
│   └── SendForm.tsx     // TODO: the form and send logic
└── .env                 // your Sepolia RPC URL

File-by-file TODOs:

• wagmi.ts — configure wagmi for Sepolia with an injected connector.
• App.tsx — a connect/disconnect button using useAccount, and the form once connected.
• SendForm.tsx — an address input, an amount input, a send button that uses useSendTransaction, and a status line driven by useWaitForTransactionReceipt.

Acceptance criteria

• Connecting shows the account; disconnecting hides the form.
• Sending validates the address and amount before enabling the button.
• The button shows "confirm in wallet", then "sending", then success or a clear failure — the three states from track 6.
• On success, the recipient's balance visibly increases.