Vybes

For fun and study, with some vy (and maybe a lil py).

🚁 rescue.vy - ^0.3.3

Testing:

• New dynamic arrays with vyper 0.3.3; the swap would have previously needed a rawcall (can see interface.vy).

Contract:

• Will recover usdc sent to the SushiV2Router on goerli.
• • removeLiquidityETHSupportingFeeOnTransferTokens, can be used to rescue tokens stuck at an address, hold tight HK for first showing me that one.
• • There are some variations on it, you can get mileage from the concept of burning tokens to free tokens.
• instructions: none

🔷 vWETH.vy - ^0.2.16

Testing:

• What a weth implemented in vyper might look like.
• • Some noteable diffs in the fallback and deposit, as you can't call functions pre declaration in vyper, nor call an external function internally.
• • Can also note a lack of requires or asserts, since they arent needed, vyper will revert on underflow.

Contract:

• Will launch a standard WETH9 style contract, chain agnostic.
• • Features support for infinate approval
• • Have gone for constants in some cases to save on gas
• Instructions: none

🍱 flashBento.vy - ^0.2.8

Testing:

• Ease with which we can perform a flash loan via bentobox.

Contract:

• Will deploy a simple contract one can use to test the flash loan function of bentobox on any network where bento is deployed.
• Instructions: constructor takes weth and bento address. Send the contract enough of the token to repay, then call the borrow function.

📝 Will add more flash loan examples on other contracts

🏦 vault.vy - ^0.2.8

Testing:

• What a vy implementation of the vault from solidity--by-example might look like

Contract:

• Will deploy a simple vault implimentation that will mint and burn shares, paying out an amount proportional to any profit or loss in that period.
• Instructions: constructor takes address of the 'farm' token.

🔮 oracle.vy - ^0.3.3

Testing:

• vy implementation of a chain link price oracle

Contract:

• Will deploy a simple oracle contract that can pull price from a feed.
• Instructions: Tested on ethereum, set feed address if deploying elsewhere.

📡 interface.vy - ^0.2.16

Testing:

• A variety of external functions calls, interfacing with contracts, includes a work around for handling dynamic arrays pre 0.3.3

Contract:

• Will launch an "interfacestation" that you can use to view a balance of a token, total supply or exchange two tokens using the router provided.
• instructions: constructor arguments include weth, and router address. Any univ2 style router should work, grab the weth address from the router.

🎫 NAS.vy - ^0.2.8

Testing:

• Minimum viable token, used in other testing.

Contract:

• Will deploy a simple token, sending the total supply to deployer. Contract features just 3 writable functions, approve, transfer and transferFrom. chain agnostic.
• Instructions: constructor takes 4 parameters, name (string), symbol(string), decimals(uint256), and supply(uint256)