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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/, 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 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:

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
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Taarush V
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inspect listener error

ERROR:__main__:{'code': -32000, 'message': 'first run for txIndex 275 error: insufficient funds for gas * price + value: address 0x9D8e2dc5615c674F329d18786D52A F10a65Af08b have 241395854351228173 want 241436981652380070'} Halts at block: https://etherscan.io/block/15538730 Tx causing the break (payment from block builder to fee receipient): https://etherscan.io/tx/0xdc8a049e7a122eebd33833627bcb1c2dc0fa57515d7273d70b73a742753f9d71

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Given the limited capacity we have, it’s best to push mev-inspect-py and the dashboards depending on it to a contributor / community maintained work stream. We would like to give a grant for the grantee to complete the following tasks in the next 2-3 months (in order of priority): Debug and fix critical bugs that stop the listener from moving forward Currently, we modified it (only in prod) to skip over blocks with errors as a hacky fix but ideally we fix issues that cause it to halt in the first place Ensure mev-inspect data <> dune export tool works Currently, as long as the listener is running, it exports that data into dune’s s3 but like mentioned above, if it stops so does the export tool Create a dashboard on Dune that looks similar to mev-explore as an example to showcase how the community can use the data to create dashboard. (we will deprecate mev-explore after this, and point any post-merge graphs to this Dune dashboard)

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Untitled

TBD What are some good heuristics to identify "arb flow" inspect can pickup arb bots that execute atomic complete swap cycles, compile their addresses for any given pool and filter that out as arb flow? but what about stat arb? are single swaps that take advantage of deviation from external "true price" to be accounted for as well? how does this change for assets that don't exist on CEXs or just have a single pool on-chain (all flow is non-arb flow?) What does arb/non-arb volume breakdown for any given pool tell us?

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Tracing + token flow analysis

Primer Process Aside from the EOA initiating the transaction itself, we check for balance changes for the contract (in the to field of the tx) that executes the arb/liquidation but also proxy contracts that can be identified by looking at the delegate calls (if any) in the tx traces. Types of traces (by action_type): Call, which happens when a method on the same contract or a different one is executed. We can identify the input parameters in each instance by looking at this trace. Self-destruct, when a arbitrage contract destroys the code at its address and transfers the ETH held in the contract to an EOA. Common pattern among searchers given gas refunds. Create, when a contract deploys another contract and transfers assets to it. Reward, pertaining to the block reward and uncle reward, not relevant here.

Jul 27, 2021
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