Separating the New Retail Wave from Crypto Natives onchain.
A live dashboard that visualizes how Coinbase Smart Wallet users (the new retail wave) behave fundamentally differently from traditional EOA holders (the crypto natives) on the Base network — plus a self-classify flow that mints you a gasless soulbound on-chain receipt.
🌐 Live: base-smart-profiler.vercel.app
📜 Contract (Base mainnet, verified): 0x3F9F8222D7c3D3363A9394BD51d2c6B17e772413
🪙 First mint: Token #1 receipt
Smart Wallets aren't just a new key-management tool — they represent a different user. The data on Base shows it clearly:
- Smart Wallet users (new retail) trend toward consumer apps, micro-transactions, and gasless flows. Average tx size is small. Top protocols are Aerodrome, Uniswap, Zora.
- Traditional EOAs (crypto natives) trend toward DeFi power tooling, large transfers, and liquidity provision. Average tx size is high. Top protocols are different.
Most analytics tools blend these two populations together and miss the story. This project surfaces the divide — and lets users self-classify, generating an on-chain artifact that itself becomes part of the dataset.
Meta-narrative: The tool that analyzes Smart Wallet adoption uses Smart Wallets to power its UX. Every analysis is a paymaster-sponsored, builder-code-attributed transaction. The dashboard is recursive.
┌─────────────────────────┐ ┌─────────────────┐ ┌──────────────────┐
│ Next.js 16 (App Router) │ ---> │ OnchainKit │ ---> │ Coinbase Smart │
│ React 19 + Tailwind 4 │ │ + wagmi + viem │ │ Wallet │
└────────────────┬────────┘ └─────────────────┘ └──────────────────┘
│
▼
┌─────────────────────────┐ ┌──────────────────┐
│ Nansen API (server) │ │ Base Paymaster │
│ (segment-level analytics)│ │ (CDP, mainnet) │
└─────────────────────────┘ └────────┬───────┘
│
▼
┌────────────────────────────┐
│ AnalysisReceipt.sol │
│ (soulbound ERC-721) │
│ Base mainnet, verified│
└────────────────────────────┘
| Layer | Technology |
|---|---|
| Framework | Next.js 16 (App Router, Turbopack) |
| UI | React 19, Tailwind CSS 4, D3.js for charts |
| Wallet | Coinbase Smart Wallet (passkey-based, ERC-4337) |
| Web3 | OnchainKit, wagmi, viem |
| Attribution | ERC-8021 Builder Code (bc_il5mvrgl) |
| Gas Sponsorship | Coinbase Developer Platform Paymaster |
| Smart Contract | Solidity 0.8.24, soulbound ERC-721 |
| Hosting | Vercel (auto-deploy from GitHub) |
- User visits the site and sees the segment dashboard
- Clicks Connect Wallet → Coinbase Smart Wallet popup (passkey, no seed phrase)
- The app detects wallet type via the wagmi connector ID
- A "Be part of the dataset" card appears: "We detected you are using a Smart Wallet"
- User clicks Mint Analysis Receipt (gasless)
- Single passkey signature → transaction submitted as an ERC-4337 user operation
- Coinbase Paymaster sponsors gas (user pays nothing)
- ERC-8021 Builder Code suffix appended to calldata for attribution
- ~5 seconds later, the user owns a soulbound
AnalysisReceiptNFT - View on Basescan link rendered
Total user UX: 2 clicks, 1 passkey tap, 0 ETH spent. No seed phrase, no gas dialog, no token approvals.
A minimal soulbound ERC-721 contract. Each receipt records:
minter— who ran the analysisanalyzedWallet— the wallet that was classifiedtimestamp— when analysis rancategory—SmartWalletorEOA
All transfer-related functions revert with a custom Soulbound() error — receipts cannot be traded, only minted.
function mint(address analyzedWallet, uint8 category) external returns (uint256);
// All revert with Soulbound()
function transferFrom(...) external pure { revert Soulbound(); }
function safeTransferFrom(...) external pure { revert Soulbound(); }
function approve(...) external pure { revert Soulbound(); }Verified source: basescan.org
git clone https://github.com/Makabeez/base-smart-profiler.git
cd base-smart-profiler
npm installCreate .env.local with:
# Coinbase Developer Platform
NEXT_PUBLIC_ONCHAINKIT_API_KEY=your_cdp_api_key
NEXT_PUBLIC_PAYMASTER_URL=your_paymaster_endpoint
# ERC-8021 Builder Code (from base.dev)
NEXT_PUBLIC_BUILDER_CODE_RAW=bc_yourcode
# AnalysisReceipt contract on Base mainnet
NEXT_PUBLIC_RECEIPT_CONTRACT=0x3F9F8222D7c3D3363A9394BD51d2c6B17e772413
# Nansen API for segment-level analytics
NANSEN_API_KEY=your_nansen_keyRun the dev server:
npm run devOpen http://localhost:3000.
Auto-deploys to Vercel on push to main. Production domain: base-smart-profiler.vercel.app.
The same set of environment variables must be configured in Vercel → Settings → Environment Variables (Production + Preview).
Every transaction triggered through this app carries an ERC-8021 data suffix linking it to Builder Code bc_il5mvrgl. Implementation:
// app/wagmi.ts
import { Attribution } from 'ox/erc8021';
const DATA_SUFFIX = Attribution.toDataSuffix({
codes: [process.env.NEXT_PUBLIC_BUILDER_CODE_RAW],
});
export const config = createConfig({
chains: [base],
connectors: [coinbaseWallet({ preference: 'smartWalletOnly' })],
dataSuffix: DATA_SUFFIX, // applied to every tx automatically
// ...
});App also registered on base.dev with verified domain (base:app_id meta tag) for ecosystem-level attribution.
MIT © 2026 Makabeez
Built solo for the Base ecosystem. Contributions welcome.