Compound V2 (compound-v2)

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Notes

• Must call Comptroller.enterMarkets([cTokenAddress]) before borrowing against a market
• Return values: 0 = success, non-zero = error code (e.g. 3 = COMPTROLLER_REJECTION)
• cToken exchange rate grows over time — holding cTokens earns interest automatically
• Each asset has its own cToken contract (not a shared pool like Aave)
• Legacy protocol — consider Compound V3 (Comet) for new deployments

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Its names in a program

function main() {
  // Ethereum's cETH, `0x4Ddc2D193948926D02f9B1fE9e1daa0718270ED5`.
  require(CompoundV2.CETH != 0);
}

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Deployments

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ABI

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CErc20ABI

• mint(uint256 mintAmount) returns (uint256)
• redeem(uint256 redeemTokens) returns (uint256)
• redeemUnderlying(uint256 redeemAmount) returns (uint256)
• borrow(uint256 borrowAmount) returns (uint256)
• repayBorrow(uint256 repayAmount) returns (uint256)
• balanceOfUnderlying(address owner) returns (uint256)
• borrowBalanceCurrent(address account) returns (uint256)

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ComptrollerABI

• enterMarkets(address[] cTokens) returns (uint256[])
• exitMarket(address cToken) returns (uint256)

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Next steps

• Protocols: the other protocols, by what they do.
• Protocols and tokens: calling a contract by its namespace, or through its ABI.
• Glossary: the words these pages use, in plain terms.