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# `SwapRocketPool.calcRethToEth` exercise Write your code inside the [`SwapRocketPool` contract](https://github.com/Cyfrin/defi-reth/blob/main/foundry/src/exercises/SwapRocketPool.sol) This exercise is design to implement a function that will calculate the exchange rate from rETH to ETH. ```solidity function calcRethToEth(uint256 rEthAmount) external view returns (uint256 ethAmount) { // Write your code here } ``` ## Instructions 1. **Calculate the rETH to ETH exchange rate** - Implement logic to compute the amount of ETH given `rEthAmount`. > **Hint:** Check the Rocket Pool contracts (`RocketDepositPool` and `RocketTokenRETH`) for how to fetch > data that are needed to calculate the exchange rate. ## Testing ```shell forge test --fork-url $FORK_URL --match-path test/exercise-swap-rocket-pool.sol --match-test test_calcRethToEth -vvv ```
A detailed guide to calculating rETH to ETH swaps in RocketPool - This lesson explores how to calculate the amount of ETH received when swapping a given amount of rETH. It involves fetching necessary data from Rocket Pool contracts and implementing the conversion logic.
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Course Overview
About the course
Rocket Pool rETH staking, yield mechanisms, trading options, and contract architecture
How to distribute rewards and calculate rETH/ETH exchange rate
How to acquire and redeem rETH
Integrating rETH into DeFi protocols like AAVE V3
How to how to create leveraged ETH positions using rETH
How to provide rETH as liquidity to Balancer and Aura
Getting the USD price of rETH using Rocket Pool NAV oracle
Re-staking with EigenLayer
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Last updated on May 12, 2025
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Solidity Developer
Rocket Pool rETH IntegrationDuration: 4min
Duration: 48min
Duration: 57min
Duration: 30min
Duration: 7min
Duration: 23min
Duration: 6min
Course Overview
About the course
Rocket Pool rETH staking, yield mechanisms, trading options, and contract architecture
How to distribute rewards and calculate rETH/ETH exchange rate
How to acquire and redeem rETH
Integrating rETH into DeFi protocols like AAVE V3
How to how to create leveraged ETH positions using rETH
How to provide rETH as liquidity to Balancer and Aura
Getting the USD price of rETH using Rocket Pool NAV oracle
Re-staking with EigenLayer
DeFi Developer
$75,000 - $200,000 (avg. salary)
Smart Contract Engineer
$100,000 - $150,000 (avg. salary)
Web3 developer
$60,000 - $150,000 (avg. salary)
Smart Contract Auditor
$100,000 - $200,000 (avg. salary)
Blockchain Financial Analyst
$100,000 - $150,000 (avg. salary)
Web3 Developer Relations
$85,000 - $125,000 (avg. salary)
Last updated on May 12, 2025
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