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Browser extension

The Umi extension brings your multi-chain wallet to any DApp. What it does:
  • Connects to Sui DApps
  • Connects to Ethereum DApps (like MetaMask)
  • Connects to Solana DApps (like Phantom)
  • Signs transactions on any supported chain
  • Syncs with your umi.app account
Install: Available for Chrome, Brave, and other Chromium browsers. Firefox and Safari coming soon. Using it:
  1. Click the Umi icon in your browser
  2. Sign in with the same account you use on umi.app
  3. When a DApp requests a wallet connection, Umi will prompt you
  4. Approve connections and sign transactions from the extension popup
Your extension uses the same addresses as your web wallet. One account everywhere.

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SDK for developers

Build Umi wallet connections into your DApp with our SDK. Install: 
npm install @umimoney/client
Basic usage: 
import { createUmiClient } from '@umimoney/client'

const umi = createUmiClient({
  appName: 'Your DApp',
  appIcon: 'https://yourdapp.com/icon.png'
})

// Connect to user's Umi wallet
const { accounts } = await umi.connect()

// Sign an Ethereum transaction
const result = await umi.signEthTransaction({
  to: '0x...',
  value: '1000000000000000000',
  chainId: 1
})

// Sign a Solana transaction
const result = await umi.signSolTransaction({
  transaction: serializedTransaction
})

// Sign a Bitcoin transaction
const result = await umi.signBtcTransaction({
  psbt: psbtBase64
})
Supported operations:
  • connect() - Connect to user’s wallet and get their addresses
  • disconnect() - End the session
  • getAccounts() - Get connected addresses
  • isConnected() - Check connection status
  • signEthTransaction() - Sign Ethereum/EVM transactions
  • signSolTransaction() - Sign Solana transactions
  • signBtcTransaction() - Sign Bitcoin transactions
  • signSuiTransaction() - Sign Sui transactions
  • signMessage() - Sign arbitrary messages
How it works: The SDK opens a secure popup to umi.app where the user approves the action. No private keys ever touch your DApp. The user stays in control.

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Why integrate with Umi

For DApp developers:
  • One integration, every chain
  • Users don’t need multiple wallet extensions
  • True self-custody without complexity
  • Growing user base
For users:
  • Connect to any DApp with one wallet
  • No switching between MetaMask, Phantom, etc.
  • Same addresses and experience everywhere
  • Full control of their keys