# IGasFeePricing

## Methods

### estimateGasFee

```solidity
function estimateGasFee(uint256 _dstChainId, bytes _options) external nonpayable returns (uint256)
```

Returns srcGasToken fee to charge in wei for the cross-chain message based on the gas limit

#### Parameters

| Name         | Type    | Description                                                                                                                |
| ------------ | ------- | -------------------------------------------------------------------------------------------------------------------------- |
| \_dstChainId | uint256 | undefined                                                                                                                  |
| \_options    | bytes   | Versioned struct used to instruct relayer on how to proceed with gas limits. Contains data on gas limit to submit tx with. |

#### Returns

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \_0  | uint256 | undefined   |

### setCostPerChain

```solidity
function setCostPerChain(uint256 _dstChainId, uint256 _gasUnitPrice, uint256 _gasTokenPriceRatio) external nonpayable
```

Permissioned method to allow an off-chain party to set what each dstChain's gas cost is priced in the srcChain's native gas currency. Example: call on ETH, setCostPerChain(43114, 30000000000, 25180000000000000) chain ID 43114 Average of 30 gwei cost to transaction on 43114 AVAX/ETH = 0.02518, scaled to gas in wei = 25180000000000000

#### Parameters

| Name                 | Type    | Description                                                                               |
| -------------------- | ------- | ----------------------------------------------------------------------------------------- |
| \_dstChainId         | uint256 | The destination chain ID - typically, standard EVM chain ID, but differs on nonEVM chains |
| \_gasUnitPrice       | uint256 | The estimated current gas price in wei of the destination chain                           |
| \_gasTokenPriceRatio | uint256 | Gas ratio of dstGasToken / srcGasToken                                                    |