# Claim Funding Fees Exercises In this exercise, you'll learn how to interact with GMX's funding fee system. This exercise focuses on: 1. Checking how much funding fees are claimable for a specific market and token pair 2. Implementing the functionality to claim those funding fees The exercise starter code is provided in `ClaimFundingFees.sol`. You won't be able to claim funding fee unless you had a position opened that received funding fees. However for this exercise, funding fees are manually allocated using Foundry's cheat code. ## Task 1: Get claimable funding fee amount ```solidity // Task 1 - Get claimable funding fee function getClaimableAmount(address market, address token) external view returns (uint256) {} ``` Implement the `getClaimableAmount` function that returns how much funding fees are available to claim for a specific market and token combination: This function should use the GMX `dataStore` to look up the claimable funding amount for: - The specified market (e.g., ETH-USDC GM token) - The specified token (e.g., WETH or USDC) - The current contract address as the recipient > Hint - Call `dataStore.getUint` and use `Keys.claimableFundingAmountKey` for the key to read from `dataStore` ## Task 2: Claim funding fees ```solidity // Task 2 - Claim funding fees function claimFundingFees() external {} ``` Implement the `claimFundingFees` function that claims all available funding fees for the contract: This function should: 1. Set up arrays of market addresses and token addresses for which you want to claim fees 2. Call `exchangeRouter.claimFundingFees` function with the appropriate parameters ## Test ```shell forge test --fork-url $FORK_URL --fork-block-number $FORK_BLOCK_NUM --match-path test/ClaimFundingFees.test.sol -vvv ```