Lido's stETH as a yield source of PoolTogether🎫🎟

【Introduction of the Lido's stETH as a yield source of PoolTogether】

• This is a smart contract that can utilize Lido's stETH as a yield source of PoolTogether.

  • Currently, several interest-bearing tokens such as Compound Token (e.g. cDAI), xSushi, AAVE Token (e.g. aDAI) is used as yield source of PoolTogether. https://docs.pooltogether.com/protocol/yield-sources

  • stETH is also a interest-bearing token (which is minted by depositing ETH as underlying asset). Therefore, stETH is suitable to be used as a yield source of PoolTogether.

  • This repo is a integration between Lido's stETH and PoolTogether yieid source interface.

 

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【Workflow】

• Diagram of workflow (Note: This repo is that only part of green one below is implemented)

 

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【Remarks】

• Version for following the Lido smart contract
  • Solidity (Solc): v0.6.12
  • Truffle: v5.1.60
  • web3.js: v1.2.9
  • openzeppelin-solidity: v3.4.1
  • ganache-cli: v6.9.1 (ganache-core: 2.10.2)

 

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【Setup】

① Install modules

• Install npm modules in the root directory

npm install

② Compile & migrate contracts (on local)

npm run migrate:local

③ Test (on local)

• 1: Start ganache-cli

ganache-cli -d

(※ -d option is the option in order to be able to use same address on Ganache-CLI every time)
(※ Please stop and re-start if an error of "Returned error: project ID does not have access to archive state" is displayed)

• 2: Execute test of the smart-contracts

npm run test:LidoYieldSource

( truffle test ./test/test-local/LidoYieldSource.test.js --network local )

【Demo】

• Video demo of test above.
  https://youtu.be/dBGuZbPMlyA

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【References】

• Lido.finance

  • Doc: https://docs.lido.fi/

  • [Deployed-addresses]: Mainnet & Görli testnet
    https://github.com/lidofinance/lido-dao#deployments

  • Smart contract: https://github.com/lidofinance/lido-dao/tree/master/contracts

    • StETH.sol: https://github.com/lidofinance/lido-dao/blob/master/contracts/0.4.24/StETH.sol#L14
    • StETHMockERC20.sol: https://github.com/lidofinance/lido-dao/blob/master/contracts/0.6.12/mocks/StETHMockERC20.sol

• PoolTogether
  • Yield Source Interface: https://github.com/pooltogether/yield-source-interface
  • Doc (Explanation about PoolTogether yield source): https://docs.pooltogether.com/protocol/yield-sources
  • Workshop: https://www.youtube.com/watch?v=sTsMt0zdOHY

• Lido - Open DeFi Hack
  https://gitcoin.co/issue/lidofinance/lido-dao/343/100025668