LFei - Marketplace between Fei token holders and arbitrageurs

These contracts provide a marketplace for Fei holders who want to sell but:

1. Don't have enough capital to quickly convert at a favorable price
2. Don't want to get involved into the complexities of an arbitrage

and, arbitrageurs who need enough capital to make their trades profitable.

Several contracts will be deployed each with a unique conversionRate, the contracts guarantee that amountFei of Fei will be converted to conversionRate*amountFei USDC.

These contracts can be treated as limit orders, where the execution is happening via arbitrageurs instead of an exchange.

Contract Flow

1. depositFei(uint256 amountFeiIn): Deposit amountFeiIn Fei into the contract and receive an equivalent amount of LFei tokens (used by Fei holders) . Deposit transaction
2. withdrawFei(uint256 amountFeiOut) : Can withdraw amountFeiOut Fei by returning amountFeiOut LFei tokens (used by Fei holders). Withdraw Fei transaction
3. swap(uint256 amountFeiOut, address to, bytes calldata data): Can flash loan amountFeiOut Fei tokens from the contract but has to return atleast conversionRate*amountFeiOut USDC tokens + 0.3% in fees. Any extra USDC can be claimed by the arbitrageur, the marketplace will give 0.3% of USDC tokens to the contract creator for each USDC withdrawal.(used by Arbitrageurs). Arbitrage transaction
4. withdrawUSDC(uint256 amountUSDCOut): Can withdraw USDC by returning LFei tokens, will burn amountUSDCOut/conversionRate lFei tokens from the user and will return amountUSDCOut USDC tokens. (used by Fei holders) Withdraw USDC transaction

Contracts

Mainnet:

3. ConversionRate = 0.9FEI<>1USDC: 0x7a3b15ee0d0884804f6e846f1f597175ea4631a8

Ropsten:

1. ConversionRate = 1FEI<>1USDC: 0xE95b5622410e56ea876fFed00C3f63c6EF3D56A6
2. ConversionRate = 0.95FEI<>1USDC: 0xfECB7F0e191Feefabd85361F91E830e88f304D2F
3. ConversionRate = 0.9FEI<>1USDC: 0xAfc6CC6ec62E0E76b03B763E36E27b055F273cdb
4. ConversionRate = 0.85FEI<>1USDC: 0x26Ba4e093122e0327971EC34811c24aF3B4b7AC5
5. ConversionRate = 0.8FEI<>USDC: 0xC8551200257aD83bbC01fE82984c815908B0Fe8C
6. ConversionRate = 0.75FEI<>USDC: 0xB2D62330ed55E23e517f6e2d48989dE8d1d1e3b2