# Potential yield pools / Ukraine design

Design goal:

- Let people delegate their funds (stables/ETH) and donate the yield
- Plug into as many yield sources w/ sufficient TVL
- Something like [https://rdai.money/](https://rdai.money/), more flexible

Proposed Architecture:
accept arbitrary token -> swap for stablecoin -> tokenize stablecoin 1:1 -> deposit stablecoin into vault -> yToken held by proxy -> bot harvests yield and sends to donation add

For ETH, BTC and stables

- Yearn vaults
- DAI, 2.35%, 360M TVL
- [https://yearn.finance/#/vault/0xdA816459F1AB5631232FE5e97a05BBBb94970c95](https://yearn.finance/#/vault/0xdA816459F1AB5631232FE5e97a05BBBb94970c95)
- USDC, 2.48%, 348M TVL
- [https://yearn.finance/#/vault/0xa354F35829Ae975e850e23e9615b11Da1B3dC4DE](https://yearn.finance/#/vault/0xa354F35829Ae975e850e23e9615b11Da1B3dC4DE)
- USDT, 2.36%, 106M TVL
- [https://yearn.finance/#/vault/0x7Da96a3891Add058AdA2E826306D812C638D87a7](https://yearn.finance/#/vault/0x7Da96a3891Add058AdA2E826306D812C638D87a7)
- Curve stETH, 4.26%, 531M TVL
- [https://yearn.finance/#/vault/0xdCD90C7f6324cfa40d7169ef80b12031770B4325](https://yearn.finance/#/vault/0xdCD90C7f6324cfa40d7169ef80b12031770B4325)
- WBTC, 2.49%, 57M TVL
- [https://yearn.finance/#/vault/0xA696a63cc78DfFa1a63E9E50587C197387FF6C7E](https://yearn.finance/#/vault/0xA696a63cc78DfFa1a63E9E50587C197387FF6C7E)
- Curve 3Crypto (BTC/USDT/ETH pool), 7.5%, 12M TVL
- [https://yearn.finance/#/vault/0xE537B5cc158EB71037D4125BDD7538421981E6AA](https://yearn.finance/#/vault/0xE537B5cc158EB71037D4125BDD7538421981E6AA)
- Convex/curve (by size)

[https://www.convexfinance.com/stake](https://www.convexfinance.com/stake)


Yearn vault integration flow:

- User deposits stables into a proxy contract, can withdraw at anytime
- Proxy contract deposits into yearn, holds yTokens on behalf
- Every X hours, a public function which harvests the yield so far (after converting into ETH?) into a pre-defined EOA

Proxy contract design notes:
* Yearn vault docs: https://docs.yearn.finance/vaults/smart-contracts/VaultAPI

Zaps:

Yearn Zap In: https://etherscan.io/address/0x92Be6ADB6a12Da0CA607F9d87DB2F9978cD6ec3E
Yearn Zap Out: https://etherscan.io/address/0xd6b88257e91e4E4D4E990B3A858c849EF2DFdE8c

Deposit Contract Specification:

Deposit: Convert sellToken into stablecoin -> tokenize stablecoin 1:1 -> Zap into Yearn vault -> send 1:1 token back to user -> retain yToken in deposit contract

Withdraw: Transfer 1:1 token from user to deposit contract -> burn 1:1 token -> compute quantity of stablecoin owed -> withdraw stablecoin from vault -> transfer stablecoin to user

Harvest:

# Testing Goals

Unit Testing
- TBD

Integration Testing
- TBD

End to End Testing
- TBD

Scenario Testing:
- Infra setup: forked mainnet
- Gotcha: need consistent 0x calldata to pass in, maybe past calldata?
- Tests:
- arbitrary tokens being swapped
- eth being swapped
- token swap to stables
- stable coin vault
- eth swap to stable
- stable coin flow through
- other coin to stable
- eth vault
- stable swap to eth
- eth flow through
- other coins to eth
- withdrawls
- stable token, and eth
- harvesting
- actually transfers to donation
- if user deposits, yield accrues, harvested, user gets same amount back
- ensure that the contract works as expected if someone send vault tokens to it directly

- Smocks Needed

- Contracts Interacted With
- Yearn Vaults