> For the complete documentation index, see [llms.txt](https://dev.init.capital/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dev.init.capital/guides/advanced-interaction/multicall.md).

# Multicall

Multicall is a way to perform multiple interactions with a position (or multiple positions) while bypassing the health checks until the end of the multicall transaction. The function can only call methods in InitCore since the multicall uses `delegatecall` to itself. 

The function creates a convenient way for users to perform multiple actions on their positions such as collateral or debt swaps, and debt rebalancing in a single transaction. One key use-case of the multicall is "flash borrow". The caller can borrow out the tokens first and eventually put collaterals back at the end of the multicall function.

Multicall also returns a bytes array of `results`.

{% hint style="info" %}
Multicall accepts a list of bytes data as arguments. Each bytes data represents the encoded multicall data to be executed to InitCore.
{% endhint %}

```solidity
// Example multicall function
function executeMulticall(uint256 posId, address lendingPoolA, uint256 borrowAAmount, address lendingPoolB, uint256 lendingBAmount) external returns (bytes[] memory results) {
    // 0. .. perform necessary actions for example pulling tokens from the caller ..
    
    // 1. build multicall bytes data
    //    Example: 1) borrow tokenA, 2) lend tokenB, 3) collateralize the deposited tokenB
    bytes[] memory calls = new bytes[](3);
    
    // build data for step 1) 
    calls[0] = abi.encodeWithSelector(IInitCore.borrow.selector, lendingPoolA, borrowAAmount, posId, address(this));
    
    // build data for step 2) – mint directly to position manager
    IERC20(ILendingPool(lendingPoolB).underlyingToken()).safeTransfer(lendingPoolB, lendingBAmount); // transfer underlying token to lending pool directly for mint
    calls[1] = abi.encodeWithSelector(IInitCore.mintTo.selector, lendingPoolB, POS_MANAGER);
    
    // build data for step 3)
    calls[2] = abi.encodeWithSelector(IInitCore.collateralize.selector, posId, lendingPoolB);
    
    results = IInitCore(INIT_CORE).multicall(calls);
}
```