SimuWallet

Inspiration

Blockchain is powerful but complex for newcomers. Many wallet apps are either too simplified or too dangerous to play with directly. We wanted to build a safe, no-risk playground where users can explore how wallets, tokens, and transactions work—without ever signing or sending anything.

What it does

SimuWallet lets users:

• Generate a mnemonic phrase (BIP39)
• Derive addresses using HD Wallet paths
• View real-time token balances (ETH, BNB, USDT, etc.)
• Analyze historical transactions via public RPC
• Simulate a token transfer transaction:
  • View function signature and calldata
  • Estimate gas fee using RPC
  • Visualize the path from sender to receiver

How we built it

• Vue 3 + Vite + TypeScript for frontend SPA structure
• TailwindCSS for elegant and responsive UI
• ethers.js to handle wallet creation, RPC calls, and smart contract simulation
• bip39 + ethereumjs-wallet to support mnemonic generation and HD key derivation
• Chart.js to visualize balance distribution
• JSON-RPC methods like eth_call, eth_estimateGas, and eth_getLogs to power data

Challenges we ran into

• Getting accurate token balances without relying on backend indexing services
• Handling RPC quirks across different chains (e.g. BSC vs Ethereum)
• Estimating gas usage in a read-only simulation mode
• Making the UI intuitive for both technical and non-technical users

Accomplishments that we're proud of

• A full-featured, purely front-end wallet simulator that is safe for users of all skill levels
• An interactive transaction simulator that shows calldata, gas usage, and routing
• Educational and developer-friendly tools packaged in a sleek UI

What we learned

• The power of JSON-RPC to drive real-time Web3 UI/UX
• How to decode calldata and simulate contract interaction without signing anything
• The importance of security-first design even in “read-only” apps

What's next for SimuWallet

• 🧠 Add “wallet health” score based on transaction behavior
• 📈 Add token price charts with historical tracking
• 🔒 Support encrypted localStorage wallet backup
• 🌐 Add Solana & other EVM chains (Polygon, Arbitrum)
• 🛠️ Export simulated calldata to be used in real dApps

Built With

• ethers
• vite
• vue3