This is a smart contract that provides functionalities for calculating the time-weighted average price (TWAP) and yield amount based on the percentage change in the TWAP for a given token pair on Uniswap V3.

• Solidity Compiler Version: 0.7.6
• Uniswap V3 Core: IUniswapV3Pool.sol
• Uniswap V3 Periphery: OracleLibrary.sol and PoolAddress.sol
• Uniswap V3 Factory: IUniswapV3Factory.sol

Check if the provided token pair is supported in the Uniswap V3 factory with the given fee tier.

• _tokenA: The address of the first token of the pair.
• _tokenB: The address of the second token of the pair.
• _fee: The fee tier of the pool.

Returns true if the pair is supported; otherwise, returns false.

Get the time-weighted average price for the given token pair with the given fee tier.

• _tokenIn: The address of the first token of the pair.
• _tokenOut: The address of the second token of the pair.
• _secondsAgo: The amount of time to look back for the TWAP, in seconds.
• _fee: The fee tier of the pool.

Returns the time-weighted average price as a uint256.

Calculates the yield amount based on the percentage change in the time-weighted average price.

• _tokenIn: The address of the first token of the pair.
• _tokenOut: The address of the second token of the pair.
• amount: The amount of tokens to calculate the yield for.
• _secondsAgo: The amount of time to look back for the initial TWAP, in seconds.
• _fee: The fee tier of the pool.

Returns the calculated yield amount as a uint256.

1. Deploy the smart contract on the Ethereum network.

2. Use the calculateYield function to calculate the yield amount based on the percentage change in the TWAP for a given token pair.

Note: Make sure to import the required Uniswap V3 interfaces and libraries before deploying the smart contract.