# Tetu Zap Solution
### Zapping
Zap solution converts a token to another using a defined route and can be used to deposit or withdraw from a vault.
Through the Zapping Function users can enjoy the efficiency of participating in a yield farming vault with just one transaction, in general with zapping users can perform only one transaction to enter and exit a yield farming vault. Without using zapping the user would have to perform between 6 \~ 8 transactions to deposit to a yield farming vault.
Withdraw and converting to the token is also possible.
{% hint style="info" %}
The zapping function can cause slippage, when using it it is better to prioritize small amounts of deposits and withdrawals.
{% endhint %}
### Contracts
This solution included three contracts
* PriceCalculator
* MultiSwap
* ZapContract
### PriceCalculator
In this solution Price Calculator will find the best liquidity pool across predefined Swap Platforms.
`getLargestPool(address token, address[] memory usedLps)`
For calculation price for any LiquidityPool pair using
`getPriceFromLp(address lpAddress, address token)`
### MultiSwap
This contract has two purposes:
Find the best route for swap two tokens. The result will contain swap pairs.
`findLpsForSwaps(address _tokenIn, address _tokenOut)`
The function should be called as a view from UI before the swap
Multi-swap will execute swaps for a given route. Used inside ZapContract but also can be used as a dedicated solution.
`multiSwap(address[] memory lps, address tokenIn, address tokenOut, uint256 amount, uint256 slippageTolerance)`
### ZapContract
This contract implements all required steps for deposit/withdraw to the vault.
### Resources
Zap Feature article on [Medium](https://medium.com/@tetu.finance/zap-feature-bc43dba8b0f8).
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