“Connect Wallet” vs “Approve”: What Are You Giving Permission For?

You visit a crypto app and click “Connect Wallet.” A moment later, another request appears: “Approve.” Then perhaps a third: “Sign.”

It is tempting to treat them all as steps towards the same button. But they can give very different permissions. Understanding the difference helps you use crypto apps without accidentally allowing more than you intended.

Let’s imagine you want to swap 20 USDC for another token. The example follows a common process on Ethereum-style networks; other networks and wallets can work differently.

Connecting introduces your wallet

A normal connection request lets the website see your selected public wallet address and ask your wallet to perform actions. It does not, by itself, give the website permission to spend your tokens.

Think of it as introducing yourself at a shop. The shop knows which customer it is dealing with, but you have not authorised a payment. Because blockchain records are public, knowing your address can also let the website look up its balances and transaction history.

Check which website is requesting the connection and which account you are sharing. A genuine connection request does not need your recovery phrase or private key. MetaMask’s explanation of wallet permissions

An approval grants spending permission

To perform your swap, the trading app may need permission for its smart contract—the program handling the trade—to move your USDC. A token approval grants that permission for a particular token and spending limit.

If you approve 20 USDC, you authorise the specified contract to spend up to that amount under the token’s allowance rules. The approval usually does not perform the swap itself. It prepares the permission the trading process needs.

Some apps request an unlimited approval instead. This can save you from approving each future trade, but it gives the approved contract much broader access to that token, potentially including tokens you receive later. It does not automatically grant access to every asset in your wallet. Ethereum’s guide to token allowances

If you only intended to swap 20 USDC, a request for unlimited spending deserves a closer look. Where your wallet supports it, you can choose a smaller spending limit.

Confirming the swap uses that permission

Once the necessary approval is in place, you may receive another request to confirm the actual trade. This is where you check what you are spending, what you expect to receive, and the fees.

In a common two-step process, the approval grants permission and the swap carries out the exchange. Some apps combine steps or use different approval methods, so focus on what each request says rather than expecting a fixed number of pop-ups.

An existing allowance can let the authorised contract move the approved token without another approval prompt. That is why the contract you trust and the amount you authorise both matter.

“Sign” does not always mean “just logging in”

A signature can prove that you control a wallet, which is useful for signing into a service. But signatures can also authorise spending or other valuable actions.

Some spending permissions use a signed message rather than a separate approval transaction. There may be no network fee when you sign, and the signature can potentially be used later. A request costing nothing to sign can still have financial consequences. MetaMask’s guide to signature phishing

Read the wallet’s explanation. If you expected a login but see spending permissions, token amounts, or an unfamiliar recipient, stop and investigate.

Disconnecting does not cancel everything

Disconnecting ends the website’s wallet connection. It does not erase your public transaction history or cancel spending allowances already recorded on the blockchain.

Removing an allowance is called revoking an approval. You can review approvals using supported wallet tools or the appropriate blockchain explorer’s approval checker. Revoking an onchain approval normally requires a network fee, and it cannot undo transfers that already happened. Uniswap’s approval-revocation guide

Before confirming a wallet request, pause for three questions: Which site is asking? What action am I authorising? How much access does it need? Those few seconds can help you distinguish a simple connection from permission to move your money.