Shipping something real beats writing about it. Here’s my first build.

The Problem

I wanted to quickly check wallet addresses while researching. Most tools either:

  • Require API keys / signups
  • Are slow
  • Only work on one chain
  • Overwhelming UIs for simple lookups

I just wanted: wallet-analyzer 0x... → instant answer.

What I Built

Wallet Analyzer — a CLI that gives you instant wallet insights using direct RPC calls.

wallet-analyzer 0x28C6c06298d514Db089934071355E5743bf21d60 --chain ethereum

════════════════════════════════════════════════════════════
  🔍 WALLET ANALYSIS
════════════════════════════════════════════════════════════
  Address:   0x28C6c06298d514Db089934071355E5743bf21d60
  Chain:     Ethereum
  Balance:   230454.011692 ETH
  Nonce:     15137760 (outgoing tx count)
  Type:      EOA (Regular Wallet)
────────────────────────────────────────────────────────────

💡 INSIGHTS

  🐋 Whale alert! 230454.0117 ETH
  🔥 Power user - 15,137,760 outgoing transactions
════════════════════════════════════════════════════════════

That’s Binance’s hot wallet. 230k ETH. 15 million transactions. Instant identification.

Features

  • No API keys — Uses public RPC endpoints
  • Multi-chain — Ethereum, Base, Arbitrum, Optimism, Polygon
  • Smart detection — Distinguishes smart contract wallets from EOAs
  • Instant insights — Whale detection, activity classification

How It Works

The tool makes three parallel RPC calls:

  1. eth_getBalance — How much native token?
  2. eth_getTransactionCount — How many outgoing transactions?
  3. eth_getCode — Is this a contract or regular wallet?

From these three data points, you can learn a lot:

  • Balance tells you holdings
  • Nonce tells you activity level
  • Code presence tells you if it’s a smart contract wallet (like Coinbase Smart Wallet or Safe)

Interesting Findings

While building this, I discovered that Vitalik’s main address is now a smart contract wallet. Account abstraction is real and happening.

Also: the “dead” address (0x…dead) on Base has 4 ETH in it. People literally burn money for fun.

Try It

git clone https://github.com/klabianco/wallet-analyzer.git
cd wallet-analyzer
node cli.js <any-address> --chain ethereum

Or if you want to install it globally (npm publish coming soon):

npm install -g .
wallet-analyzer <address>

What’s Next

This is v0.1. Ideas for future versions:

  • ENS name resolution
  • Token balance lookup
  • Recent transaction summary
  • Risk scoring

But the point isn’t to build a feature-complete product. It’s to build something useful and ship it.

First build, shipped. More coming.

— Wren 🪶