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Repay

Learn how to repay a debt on Morpho, on-chain via a Smart Contract & off-chain via ethers.js.
Repay the debt of anyone, off-chain through Etherscan or with ethers.js, or on-chain using a Smart Contract. Here are concrete examples 👇

Morpho-Compound

Solidity
ethers.js
// SPDX-License-Identifier: GNU AGPLv3
pragma solidity ^0.8.16;
import {IMorpho} from "@morpho-dao/morpho-core-v1/contracts/compound/interfaces/IMorpho.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
interface IWETH9 {
function deposit() external payable;
}
contract MorphoCompoundRepayer {
address public constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
address public constant CETH = 0x4Ddc2D193948926D02f9B1fE9e1daa0718270ED5;
address public constant DAI = 0x6B175474E89094C44Da98b954EedeAC495271d0F;
address public constant CDAI = 0x5d3a536E4D6DbD6114cc1Ead35777bAB948E3643;
address public constant MORPHO = 0x8888882f8f843896699869179fB6E4f7e3B58888;
function _repayERC20(
address _cToken,
address _underlying,
uint256 _amount
) internal {
IERC20(_underlying).approve(MORPHO, _amount);
IMorpho(MORPHO).repay(
_cToken,
address(this), // the address of the user you want to repay on behalf of
_amount
);
}
function repayDAI(uint256 _amount) external {
_repayERC20(
CDAI, // the DAI market, represented by the cDAI ERC20 token
DAI,
_amount
);
}
function repayETH() external payable {
// first wrap ETH into WETH
IWETH9(WETH).deposit{value: msg.value}();
_repayERC20(
CETH, // the WETH market, represented by the cETH ERC20 token
WETH,
msg.value
);
}
}
import ethers from "ethers";
const signer = new ethers.Wallet(
process.env.PRIVATE_KEY,
new ethers.providers.JsonRpcBatchProvider(process.env.RPC_URL)
);
const signerAddress = await signer.getAddress();
const cEthAddress = "0x4Ddc2D193948926D02f9B1fE9e1daa0718270ED5";
const cDaiAddress = "0x5d3a536E4D6DbD6114cc1Ead35777bAB948E3643";
const daiDecimals = 18;
const weth = new ethers.Contract(
"0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
[
"function deposit() external payable",
"function approve(address, uint256) external returns (bool)",
],
signer
);
const dai = new ethers.Contract(
"0x6B175474E89094C44Da98b954EedeAC495271d0F",
["function approve(address, uint256) external returns (bool)"],
signer
);
const morpho = new ethers.Contract(
"0x8888882f8f843896699869179fB6E4f7e3B58888",
["function repay(address, address, uint256) external"],
signer
);
async function repayERC20(cTokenAddress, underlying, amount) {
await underlying.approve(morpho.address, amount);
await morpho.repay(
cTokenAddress,
signerAddress, // the address of the user you want to supply on behalf of
amount
);
}
async function repayDAI(amount) {
return repayERC20(
cDaiAddress, // the DAI market, represented by the cDAI ERC20 token
dai,
amount
);
}
async function repayETH(amount) {
// first wrap ETH into WETH
await weth.deposit({ value: amount });
return repayERC20(
cEthAddress, // the WETH market, represented by the cETH ERC20 token
weth,
amount
);
}
// repayDAI(ethers.utils.parseUnits(100, 18)); // DAI has 18 decimals
// repayETH(ethers.utils.parseEther(1));

Morpho-AaveV2

Solidity
ethers.js
// SPDX-License-Identifier: GNU AGPLv3
pragma solidity ^0.8.16;
import {IMorpho} from "./interfaces/IMorpho.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
interface IWETH9 {
function deposit() external payable;
}
contract MorphoAaveV2Repayer {
address public constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
address public constant AWETH = 0x030bA81f1c18d280636F32af80b9AAd02Cf0854e;
address public constant DAI = 0x6B175474E89094C44Da98b954EedeAC495271d0F;
address public constant ADAI = 0x028171bCA77440897B824Ca71D1c56caC55b68A3;
address public constant MORPHO = 0x777777c9898D384F785Ee44Acfe945efDFf5f3E0;
function _repayERC20(
address _aToken,
address _underlying,
uint256 _amount
) internal {
IERC20(_underlying).approve(MORPHO, _amount);
IMorpho(MORPHO).repay(
_aToken,
address(this), // the address of the user you want to repay on behalf of
_amount
);
}
function repayDAI(uint256 _amount) public {
_repayERC20(
ADAI, // the DAI market, represented by the aDAI ERC20 token
DAI,
_amount
);
}
function repayETH() public payable {
// first wrap ETH into WETH
IWETH9(WETH).deposit{value: msg.value}();
_repayERC20(
AWETH, // the WETH market, represented by the aWETH ERC20 token
WETH,
msg.value
);
}
}
import ethers from "ethers";
const signer = new ethers.Wallet(
process.env.PRIVATE_KEY,
new ethers.providers.JsonRpcBatchProvider(process.env.RPC_URL)
);
const signerAddress = await signer.getAddress();
const aWethAddress = "0x030bA81f1c18d280636F32af80b9AAd02Cf0854e";
const aDaiAddress = "0x028171bCA77440897B824Ca71D1c56caC55b68A3";
const daiDecimals = 18;
const weth = new ethers.Contract(
"0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
[
"function deposit() external payable",
"function approve(address, uint256) external returns (bool)",
],
signer
);
const dai = new ethers.Contract(
"0x6B175474E89094C44Da98b954EedeAC495271d0F",
["function approve(address, uint256) external returns (bool)"],
signer
);
const morpho = new ethers.Contract(
"0x777777c9898d384f785ee44acfe945efdff5f3e0",
["function repay(address, address, uint256) external"],
signer
);
async function repayERC20(aTokenAddress, underlying, amount) {
await underlying.approve(morpho.address, amount);
await morpho.repay(
aTokenAddress,
signerAddress, // the address of the user you want to supply on behalf of
amount
);
}
async function repayDAI(amount) {
return repayERC20(
aDaiAddress, // the DAI market, represented by the aDAI ERC20 token
dai,
amount
);
}
async function repayETH(amount) {
// first wrap ETH into WETH
await weth.deposit({ value: amount });
return repayERC20(
aWethAddress, // the WETH market, represented by the cETH ERC20 token
weth,
amount
);
}
// repayDAI(ethers.utils.parseUnits(100, 18)); // DAI has 18 decimals
// repayETH(ethers.utils.parseEther(1));