# Router contracts/wombat-core/libraries/WombatRouter.sol > Title: WombatRouter > Notice: Allows routing on different wombat pools > Details: Owner is allowed and required to approve token spending by pools via approveSpendingByPool function. With great thanks to the uniswap team for your contribution to the opensource community reference: ### *constructor* ***constructor(\_wNative)*** Arguments | **name** | **type** | **description** | | --------- | -------- | --------------- | | \_wNative | address | | ### *event* OwnershipTransferred \*\*\*WombatRouter.OwnershipTransferred(previousOwner, newOwner) \*\*\* Arguments | **name** | **type** | **description** | | ------------- | -------- | --------------- | | previousOwner | address | indexed | | newOwner | address | indexed | ### *function* addLiquidityNative ***WombatRouter.addLiquidityNative(pool, minimumLiquidity, to, deadline, shouldStake) payable*** Arguments | **name** | **type** | **description** | | ---------------- | -------- | --------------- | | pool | address | | | minimumLiquidity | uint256 | | | to | address | | | deadline | uint256 | | | shouldStake | bool | | Outputs | **name** | **type** | **description** | | --------- | -------- | --------------- | | liquidity | uint256 | | ### *function* approveSpendingByPool \*\*\*WombatRouter.approveSpendingByPool(tokens, pool) \*\*\* > Notice: approve spending of router tokens by pool > Details: needs to be done after asset deployment for router to be able to support the tokens Arguments | **name** | **type** | **description** | | -------- | ---------- | ------------------------------ | | tokens | address\[] | array of tokens to be approved | | pool | address | to be approved to spend | ### *function* getAmountIn ***WombatRouter.getAmountIn(tokenPath, poolPath, amountOut) view*** > Notice: Returns the minimum input asset amount required to buy the given output asset amount (accounting for fees and slippage) Note: This function should be used as estimation only. The actual swap amount might be different due to precision error (the error is typically under 1e-6) Arguments | **name** | **type** | **description** | | --------- | ---------- | ------------------- | | tokenPath | address\[] | The token swap path | | poolPath | address\[] | The token pool path | | amountOut | uint256 | The to amount | Outputs | **name** | **type** | **description** | | -------- | ---------- | --------------------------------------------- | | amountIn | uint256 | The potential final amount user would receive | | haircuts | uint256\[] | | ### *function* getAmountOut ***WombatRouter.getAmountOut(tokenPath, poolPath, amountIn) view*** > Notice: Given an input asset amount and an array of token addresses, calculates the maximum output token amount (accounting for fees and slippage). Arguments | **name** | **type** | **description** | | --------- | ---------- | ------------------- | | tokenPath | address\[] | The token swap path | | poolPath | address\[] | The token pool path | | amountIn | int256 | The from amount | Outputs | **name** | **type** | **description** | | --------- | ---------- | --------------------------------------------- | | amountOut | uint256 | The potential final amount user would receive | | haircuts | uint256\[] | | ### *function* owner ***WombatRouter.owner() view*** > Details: Returns the address of the current owner. Outputs | **name** | **type** | **description** | | -------- | -------- | --------------- | | | address | | ### *function* removeLiquidityFromOtherAssetAsNative \*\*\*WombatRouter.removeLiquidityFromOtherAssetAsNative(pool, fromToken, liquidity, minimumAmount, to, deadline) \*\*\* Arguments | **name** | **type** | **description** | | ------------- | -------- | --------------- | | pool | address | | | fromToken | address | | | liquidity | uint256 | | | minimumAmount | uint256 | | | to | address | | | deadline | uint256 | | Outputs | **name** | **type** | **description** | | -------- | -------- | --------------- | | amount | uint256 | | ### *function* removeLiquidityNative \*\*\*WombatRouter.removeLiquidityNative(pool, liquidity, minimumAmount, to, deadline) \*\*\* Arguments | **name** | **type** | **description** | | ------------- | -------- | --------------- | | pool | address | | | liquidity | uint256 | | | minimumAmount | uint256 | | | to | address | | | deadline | uint256 | | Outputs | **name** | **type** | **description** | | -------- | -------- | --------------- | | amount | uint256 | | ### *function* renounceOwnership \*\*\*WombatRouter.renounceOwnership() \*\*\* > Details: Leaves the contract without owner. It will not be possible to call `onlyOwner` functions anymore. Can only be called by the current owner. NOTE: Renouncing ownership will leave the contract without an owner, thereby removing any functionality that is only available to the owner. ### *function* swapExactNativeForTokens ***WombatRouter.swapExactNativeForTokens(tokenPath, poolPath, minimumamountOut, to, deadline) payable*** Arguments | **name** | **type** | **description** | | ---------------- | ---------- | --------------- | | tokenPath | address\[] | | | poolPath | address\[] | | | minimumamountOut | uint256 | | | to | address | | | deadline | uint256 | | Outputs | **name** | **type** | **description** | | --------- | -------- | --------------- | | amountOut | uint256 | | ### *function* swapExactTokensForNative \*\*\*WombatRouter.swapExactTokensForNative(tokenPath, poolPath, amountIn, minimumamountOut, to, deadline) \*\*\* Arguments | **name** | **type** | **description** | | ---------------- | ---------- | --------------- | | tokenPath | address\[] | | | poolPath | address\[] | | | amountIn | uint256 | | | minimumamountOut | uint256 | | | to | address | | | deadline | uint256 | | Outputs | **name** | **type** | **description** | | --------- | -------- | --------------- | | amountOut | uint256 | | ### *function* swapExactTokensForTokens \*\*\*WombatRouter.swapExactTokensForTokens(tokenPath, poolPath, amountIn, minimumamountOut, to, deadline) \*\*\* > Notice: Swaps an exact amount of input tokens for as many output tokens as possible, along the route determined by the path Arguments | **name** | **type** | **description** | | ---------------- | ---------- | --------------------------------------------------------------------------------------- | | tokenPath | address\[] | The first element of the path is the input token, the last element is the output token. | | poolPath | address\[] | An array of pool addresses. The pools where the pathTokens are contained in order. | | amountIn | uint256 | the amount in | | minimumamountOut | uint256 | the minimum amount to get for user | | to | address | the user to send the tokens to | | deadline | uint256 | the deadline to respect | Outputs | **name** | **type** | **description** | | --------- | -------- | ---------------- | | amountOut | uint256 | received by user | ### *function* transferOwnership \*\*\*WombatRouter.transferOwnership(newOwner) \*\*\* > Details: Transfers ownership of the contract to a new account (`newOwner`). Can only be called by the current owner. Arguments | **name** | **type** | **description** | | -------- | -------- | --------------- | | newOwner | address | | ### *function* wNative ***WombatRouter.wNative() view*** Outputs | **name** | **type** | **description** | | -------- | -------- | --------------- | | | address | |