# Cream Backend homework

This homework is designed to evaluate candidates's capability that includes but not limit to the following different aspects

- Problem solving skills
- Learning skills
- Ethereum smart contract, event logs
- Cream lending platform domain knowledge
- Project planing skills
- Coding related skills
- k8s related skills

Feel free to ask any question in the telegram group.

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## Implement a market monitor that runs on k8s (minikube)

Monitor crUSDC on ethereum
contract address: [0x44fbebd2f576670a6c33f6fc0b00aa8c5753b322](https://etherscan.io/address/0x44fbebd2f576670a6c33f6fc0b00aa8c5753b322#readProxyContract)

### Useful tools and docs
- Library for interacting with the Ethereum Blockchain: https://docs.ethers.io/v5/
- Recommended RPC provider: https://docs.ethers.io/v5/api-keys/#api-keys--infura

### 1. Status to monitor (every 100 blocks)
1. supplyRatePerBlock
2. borrowRatePerBlock

Query blockchain to get supplyRatePerBlock and borrowRatePerBlock of crUSDC every 100 blocks

Format:
`{ block number } supply rate: { supply rate }`
`{ block number } borrow rate: { borrow rate }`

### 2. Events to monitor
1. Mint
2. Redeem
3. Borrow
4. RepayBorrow

Format:
{ block number }: { tx hash }
{ minter } Mint { mintTokens } crUSDC with { mintAmount } USDC { tx hash }

{ block number }: { tx hash }
{ redeemer } Redeem { redeemAmount } USDC, burn { redeemTokens } crUSDC

{ block number }: { tx hash }
{ borrower } Borrow { borrowerAmount } USDC

{ block number }: { tx hash }
{ payer } RepayBorrow { repayAmount } USDC for { borrower }

### Expected output example:

#12873672 0x30a69cfb584fc9bff26a9348d77041b58b6d44813ae81a423f80bca5e63677aa
0x167539702b5501aadd9b0b85e53532fd57cc71a9 Borrow 30000 USDC

#12873762 supply rate: 16907364515
#12873762 borrow rate: 40104700913

#12873862 supply rate: 16907364515
#12873862 borrow rate: 40104700913

#12873915: 0x1e33d0090d5e3fedffe1e945598a9c4e0912b5334597483b0973d2d79b78af03
0x32d2d8a08e29668492724b83d81c750123b6b905 Redeem 463836.024217 USDC burn 20568084.82722413 crUSDC

#12873962 supply rate: 17437464695
#12873962 borrow rate: 40728554291

#12873998 0x1de9580fdea6514c9b20d74845ed019ecf762b8789450f9069dd3e864063d92f
0xeaba5f84e0409b8ae10445e1a89e56e67680b0c7 RepayBorrow 1426.481981 USDC for 0xeaba5f84e0409b8ae10445e1a89e56e67680b0c7

#12874062 supply rate: 17434026379
#12874062 borrow rate: 40724538669

#12874162 supply rate: 17071649940
#12874162 borrow rate: 40299074497

#12874262 supply rate: 17071649940
#12874262 borrow rate: 40299074497

#12874362 supply rate: 17071649940
#12874362 borrow rate: 40299074497

#12874462 supply rate: 17071649940
#12874462 borrow rate: 40299074497

#12874562 supply rate: 17071649940
#12874562 borrow rate: 40299074497

#12874662 supply rate: 17065896573
#12874662 borrow rate: 40292283269

#12874762: 0x83cc56903d46512e56d71359d1b5af3d019db9005ec10e8ec7501bec343e4b65
0x6ced59a8d2da7bdf3e6c2920f632421a8f3c34d1 Mint 8868559.14076667 crUSDC with 200000 USDC

#12874762 supply rate: 16841814176
#12874762 borrow rate: 40026881873