Privy MPC wallet demo

[mauridev777]

🏓 BNB Ping Pong DApp — Privy MPC Wallet Demo

This is a minimal web3 DApp that demonstrates how to use Privy Embedded Wallets to interact with a smart contract on the BNB Testnet. Players can click Ping or Pong, which sends an on-chain transaction via Privy, updating the contract state.

📍 Demo Details

• LIVE WEBSITE: BNB PING PONG DEMO
• Network: BNB Chain Testnet (Chain ID: 97)
• Verified Contract Code: 0x52943bFb088221cd6E3181fbc19081A6B34be948
• RPC URL: https://data-seed-prebsc-1-s1.binance.org:8545/

📦 Tech Stack

• Next.js 14 (App Router)
• Tailwind CSS
• Ethers.js
• Privy Embedded Wallet SDK
• React Hot Toast

🛠 How to Run Locally

1. Clone the repo

git clone https://github.com/yourusername/bnb-pingpong.git
cd bnb-pingpong

2. Install dependencies

npm install

3. Configure environment variables

Copy the .env.example to .env.local:

cp .env.example .env.local

Then update the following fields with your Privy credentials:

NEXT_PUBLIC_PRIVY_APP_ID=YOUR_PRIVY_APP_ID
PRIVY_APP_SECRET=YOUR_PRIVY_APP_SECRET

4. Create a Privy Project

1. Go to https://www.privy.io
2. Create a new account or log in
3. Create a new app
4. Enable:
   • Embedded Wallet
   • Email
   • Social Media Logins
5. Copy your:
   • App ID → use for NEXT_PUBLIC_PRIVY_APP_ID
   • App Secret → use for PRIVY_APP_SECRET
6. Add http://localhost:3000 to the allowed origins in your Privy dashboard

5. Start the dev server

npm run dev

Visit http://localhost:3000 in your browser.

📄 Smart Contract ABI

function ping() external;
function pong() external;
function pingCount() view returns (uint256);
function pongCount() view returns (uint256);
function nextMove() view returns (string);

🔔 UX Notes

• You will see a toast after transaction is sent (with link to BscScan)
• Toasts appear above Privy modals
• This demo uses Privy's useSendTransaction() with success callbacks

🧪 BNB Testnet Faucet

Get testnet BNB from:
👉 https://bnb-faucet.netlify.app/

📁 .env.example

Use this template to set up your local .env.local file:

NEXT_PUBLIC_PRIVY_APP_ID=YOUR_PRIVY_APP_ID
PRIVY_APP_SECRET=YOUR_PRIVY_APP_SECRET
PINGPONG_ADDRESS=0x52943bFb088221cd6E3181fbc19081A6B34be948
RPC_URL=https://data-seed-prebsc-1-s1.binance.org:8545/
NEXT_PUBLIC_PINGPONG_CONTRACT_ADDRESS=0x52943bFb088221cd6E3181fbc19081A6B34be948
NEXT_PUBLIC_RPC_URL=https://data-seed-prebsc-1-s1.binance.org:8545/

📜 License

MIT — use freely for demos, hacks, and experimentation.

Made with 💛 on BNB Testnet.

[Tianaliu]

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[mauridev777]

Congrats! You are the bounty winner. Please share your BSC address for the reward. thanks! https://x.com/BNBChainDevs/status/1950753301496254648

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0x354754c0f812e673858070586e462ce78ff1a43a