# Approve

TL;DR:- Approvals are required because Polynomial uses the Ethereum blockchain to settle transactions.

When using a Decentralized Application(dApp) like Polynomial, you must first approve each token you plan to deposit. Polynomial uses smart contracts on the Ethereum blockchain to execute transactions.

To use a smart contract, you must : 

* Permit it to validate your token balance
* Let it transfer the number of tokens you wish to trade from your wallet.

<img src="/files/fqIc6MYWT12NRDm37nVV" alt="" data-size="original">


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