# ERC20 Permit2

{% hint style="info" %}
**2HOT DAO** uses UNISWAP v3 system (ATM-until DAO) for token buying and contracts. \
Uniswap secure Permit2 Contract can be found at the address:\
0x000000000022D473030F116dDEE9F6B43aC78BA3\
Uniswap v3 Router:\
0xE592427A0AEce92De3Edee1F18E0157C05861564
{% endhint %}

### What is ERC20 Approval/Permit2?

ERC20 approval is a process in which an Ethereum token holder grants permission to a smart contract to spend a specific amount of tokens on their behalf. This approval is necessary for the transfer of tokens from one address to another.\
\
2HOT DAO approval is done directly on the verified Ethereum Contract, and cannot be spendable after the "Buying of the xHOT"

```
// function buy(uint256 _amount) external nonReentrant {
        uint256 weiAmount = _amount.mul(price).div(decimals);
        token.safeTransferFrom(msg.sender, owner, _amount);
        totalSold = totalSold.add(_amount);
        emit Sold(msg.sender, _amount);
    }
```


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