# createStrategy()

{% hint style="danger" %}
Only standard ERC20 tokens are supported \
(rebase, fee-on-transfer etc are not supported)
{% endhint %}

{% code title="CarbonController.sol" overflow="wrap" lineNumbers="true" %}

```solidity
    function createStrategy(
        Token token0,
        Token token1,
        Order[2] calldata orders
    ) external payable nonReentrant whenNotPaused onlyProxyDelegate returns (uint256)
```

{% endcode %}

This function is used to create a strategy on Carbon DeFi. Each strategy must include two linked orders. 

### **Function Arguments**

<table><thead><tr><th width="171">Name</th><th width="159.66666666666663">Type</th><th>Description</th></tr></thead><tbody><tr><td>token0</td><td>Token</td><td>The first token in the strategy. Order0 will be referring to selling this token for token1. <br>(The Carbon DeFi UI will use this as "<a href="https://www.investopedia.com/terms/b/basecurrency.asp">Base</a>" token)</td></tr><tr><td>token1</td><td>Token</td><td>The second token in the strategy. <br>Order1 will be referring to selling this token for token0. <br>(The Carbon DeFi UI will use this as "<a href="https://www.investopedia.com/terms/q/quotecurrency.asp">Quote</a>" token)</td></tr><tr><td>orders</td><td>array</td><td>This is an array of two Order objects. Each order contains the following:<br><strong>y: uint128</strong> The amount of tokens deposited into the order.<br><strong>z: uint128</strong>  The y intercept of the order, which is used to calculate the marginal price.<br><strong>A: uint64</strong> Price range (width) parameter, encoded. <br><strong>B: uint64</strong> Price range (edge) parameter, encoded.  </td></tr></tbody></table>

### Example

{% code overflow="wrap" %}

```solidity
createStrategy(
0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, //token0 ETH
0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48, //token1 USDC
[{y, z, A, B}, // order0, selling token0 (ETH) for token1 (USDC)
{y, z, A, B}], // order1, selling token1 (USDC) for token0 (ETH)
)

// In the Carbon DeFi UI, this will appear with rates in units of ETH per USDC. 
```

{% endcode %}

### Returns

This function returns the assigned id of the strategy.

### Important notes

{% hint style="success" %}

* While all required data is available on chain, it is recommended to use the [Carbon DeFi SDK](https://docs.carbondefi.xyz/developer-guides/carbon-defi-sdk).
* *Due to input value normalization and memory restrictions, the order parameters stored on chain might be slightly different than those \`input\` via the UI and/or the SDK.*&#x20;
  {% endhint %}

### Example

```
//user inputs

{
    'liquidity'    : 759250124,
    'lowestRate'   : 309485009821345068724781056.000000000000000000000,
    'highestRate'  : 309485009821345068724781056.000000000014551915228,
    'marginalRate' : 309485009821345068724781056.000000000000000000019
}

//encoded order

{
    'y': 759250124, 
    'z': 759250124, 
    'A': 0, 
    'B': 12807111440334848
}

//decoded order

{
    'liquidity'    : 759250124,
    'lowestRate'   : 309485009821345068724781056,
    'highestRate'  : 309485009821345068724781056,
    'marginalRate' : 309485009821345068724781056
}

```

{% hint style="info" %}
To create a strategy with the ETH token, use the contract address: *0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE*&#x20;
{% endhint %}