Browser extension · Self-custody Web3 access

The Coinbase Wallet Extension that turns any browser tab into a Web3 front door.

One lightweight install to connect with decentralized applications, review what you sign, and keep your digital assets under your own keys — on Ethereum, Base, Polygon and beyond.

Get started in 4 steps Read the guide
Chains supported
12+
Setup time
~2 min
Key custody
Yours
dapp.example/swap
Total balance Connected

$12,480.26

0x7A9f…4C21

Send Receive Swap Buy
  • EthereumETH · Mainnet 3.412+1.8%
  • BaseUSDC · Base 4,120+0.2%
  • PolygonPOL · Polygon 980−0.6%
Self-custody Recovery phrase stays with you
Signature requested Review network & contract
EthereumBasePolygonArbitrumOptimism SolanaAvalancheBNB ChainZoraLinea

Why an extension wallet

Everything a Web3 session needs, one toolbar click away

The extension lives inside the browser you already use. No extra app to open, no copying addresses between windows — just a prompt you approve or decline.

  • Web3 connectivity

    Connect to dApps in one tap. The site receives your public address — never your seed phrase or private keys.

  • Digital asset management

    Track tokens and collectibles across networks in a single portfolio view, with balances that refresh as you switch chains.

  • Transaction awareness

    Every request is shown before it is signed: network, contract, amount and estimated fee. Decline anything unexpected.

  • Wallet security

    Local key storage, password lock, and optional hardware-wallet confirmation for higher-value activity.

  • Privacy considerations

    Public blockchains are transparent by design. Use fresh addresses and review connected sites to limit how much is linked to you.

  • Responsible self custody

    You are the only one who can recover your wallet. Back up offline, start small, and never share a recovery phrase.

Getting started

Four steps from install to first signature

  1. 01

    Install the extension

    Add it from your browser's official extension store, then pin the icon so it stays in view.

  2. 02

    Create or import a wallet

    Choose a new self-custody wallet, or import an existing one with its recovery phrase. Set a strong local password.

  3. 03

    Back up the recovery phrase

    Write the words on paper, store them offline, and never type them into a website, chat or support form.

  4. 04

    Connect and transact

    Visit a dApp, approve the connection, then review each transaction request before signing it.

Security & privacy

Good habits beat clever tools

A browser wallet is only as safe as the sites you connect to. Most losses come from a signature given to the wrong contract, not from a broken wallet. Slow down at the confirmation screen.

  • Confirm the network before approving — a wrong chain can route funds unexpectedly.
  • Read the contract address and the spender allowance on approval requests.
  • Periodically revoke dApp permissions you no longer use.
  • Keep the extension and your browser updated.
  • Consider a hardware wallet for balances that would hurt to lose.
  • Remember the recovery phrase is the wallet — anything else is a copy.
Web3 Wallets 7 min read Self-custody basics

Coinbase Wallet Extension: A Practical Guide to Web3 Connectivity

What the extension is, how to set it up, and the habits that keep self-custody calm rather than stressful.

Coinbase Wallet Extension is a browser-based gateway that lets you connect to decentralized applications without leaving the page you are reading. Once installed, it sits quietly in your toolbar and acts as the bridge between the websites you visit and the blockchains behind them.

Getting started is straightforward. Install the extension from your browser's official store, create a new self-custody wallet, and write the recovery phrase down offline. Because self-custody means the keys live with you, there is no support desk anywhere that can restore that phrase for you.

With the extension active, visiting a decentralized exchange, NFT marketplace or onchain game shows a connect prompt. Approving it shares only your public address. Every transaction afterwards is an explicit request you review and sign — check the network, the contract and the amount before confirming.

For digital asset management, the wallet view keeps tokens and collectibles in one place across networks such as Ethereum, Base and Polygon. Wallet security and privacy considerations matter here: connect only to sites you trust, revoke permissions you no longer use, and treat hardware confirmation as the default for anything valuable.

Responsible practice is simple. Start small, verify twice, and remember that in self custody the recovery phrase is the wallet.

Treat every signature like a signature on paper: read it before you give it.

Key takeaways

  • Install once, pin the icon, and keep it updated.
  • Back up the recovery phrase offline before moving any funds.
  • Review network, contract and amount on every request.
  • Revoke dApp connections you have stopped using.

FAQ

Common questions

Is the extension the same as a Coinbase exchange account?

No. An exchange account is custodial: the platform holds the assets. A wallet extension is self-custody — your keys stay in your browser's encrypted storage and you approve every transaction yourself.

Can the extension recover my wallet if I forget the password?

You can reset the local password with your recovery phrase. Without that phrase the wallet cannot be restored by anyone, which is exactly why it should be written down and stored offline.

Does connecting a dApp expose my balances?

Connecting shares your public address, which is visible on-chain. A well-built dApp asks for specific permissions at the point of action rather than everything at once.

Which networks can I use?

Popular networks such as Ethereum, Base, Polygon, Arbitrum and Optimism are commonly supported, and the list grows over time. Switch networks in the wallet before interacting with a dApp.

What should I do if I approved something suspicious?

Revoke the connection and any token allowances immediately, move remaining assets to a fresh wallet if you can, and treat the exposed address as compromised.

Ready to open your first Web3 tab?

Follow the four-step setup, keep the recovery phrase offline, and connect with confidence.

Start the setup