Bounded ERC-20 Approval Before a DeFi Deposit

Bounded ERC-20 Approval Before a DeFi Deposit

When a verified DeFi app requests a standard ERC-20 approval before your first deposit, authorize only the intended amount for its verified spender, then submit the deposit separately. Approval grants permission for that spender to transfer tokens from your wallet; it does not move the tokens into the app.

Approval Sets Permission, Not the Deposit

An approval is a separate on-chain transaction that sets an allowance: the maximum amount the specified spender may transfer from your account. The deposit is another transaction that asks the app to use tokens for the position you chose.

  • Approval: permits the spender to transfer up to the allowance.
  • Deposit: carries out the app’s requested operation with your tokens.
  • Allowance remaining: shows how much permission is still available to that spender.

These steps work together, but they are not interchangeable: the approval makes a later transfer possible, while the deposit initiates it. Think of approval as giving a named service a spending limit and the deposit as placing a specific order. Unlike a paper limit, the on-chain allowance remains in effect until it is used, changed, or revoked.

Set the Allowance and Submit the Deposit

Before approving, read the current allowance and the amount requested, then match the token, spender address, and network to the app you verified. If the app supports a custom amount, enter the amount you intend to deposit; a smaller allowance limits available spending authority, though another deposit may require another approval.

If the app needs a network you have not added, Chainlist can help prepare its network settings. That setup only helps your wallet connect to the network; it does not verify the app or make its spender trustworthy. You still need enough of the network’s fee token to submit both transactions.

Confirm the approval and wait for it to be included successfully before submitting the deposit. Some tokens require the existing nonzero allowance to be set to zero before it can be changed; if the app requests that reset, review the spender and amount again, confirm the reset, then approve the intended amount. A reset changes the approval sequence, not the need to submit a separate deposit.

Confirm the Credit and Remaining Permission

After the deposit transaction succeeds, inspect its receipt and the app’s credited position, then read the allowance again for that token and spender. The remaining amount depends on what the deposit actually used, so it may be zero or may still permit another transfer.

A bounded approval is a deliberate limit, not proof that the spender is safe. Keep the amount aligned with the intended deposit, and use what Chainlist prepares for a DeFi app to understand the network setup that comes before these transactions. Once the position is credited and you know the remaining allowance, you can decide whether to leave it available or revoke it.

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