> For the complete documentation index, see [llms.txt](https://docs.earn.polynomial.fi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.earn.polynomial.fi/technical-implementation/approve.md).

# 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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