Morpho Blue

Morpho Blue is a permissionless, immutable lending primitive on Ethereum. Unlike Aave or Compound, Morpho Blue has no governance, no upgradeability, and no admin keys. Anyone can create an isolated lending market by specifying a loan token, collateral token, oracle, interest rate model, and liquidation LTV. A single singleton contract holds all markets. MetaMorpho vaults sit on top, providing curated, multi-market lending strategies with ERC-4626 interfaces.

What You Probably Got Wrong

LLMs confuse Morpho Optimizer (V1) with Morpho Blue. They also hallucinate Aave-style pooled risk. These corrections are non-negotiable.

• This is NOT Morpho Optimizer (V1) -- Morpho Optimizer was a peer-to-peer matching layer on top of Aave/Compound. Morpho Blue is a standalone, independent lending protocol with its own singleton contract. Different addresses, different interfaces, different architecture. If you see MorphoAaveV2 or MorphoCompound, you are writing V1 code. Stop.
• Market ID = keccak256(abi.encode(loanToken, collateralToken, oracle, irm, lltv)) -- The market is identified by a bytes32 hash of its five parameters. Not a numeric index. Not an address. If you are passing a uint256 market index, you are wrong.
• One singleton contract for ALL markets -- Every market lives inside the same Morpho contract at 0xBBBBBbbBBb9cC5e90e3b3Af64bdAF62C37EEFFCb. There are no per-market contracts to deploy or interact with.
• LLTV is NOT the same as LTV -- LLTV (Liquidation Loan-To-Value) is the threshold at which a position becomes liquidatable. It is NOT the maximum amount you can borrow. You can borrow up to LLTV, but doing so means instant liquidation risk. Always borrow well below LLTV.
• MetaMorpho vaults are a separate layer -- Morpho Blue markets are the primitive. MetaMorpho vaults are ERC-4626 wrappers that allocate deposits across multiple Morpho Blue markets. Supplying to a vault is NOT the same as supplying directly to a market. Different contracts, different interfaces.
• Shares, not balances -- Morpho Blue tracks positions using shares internally (like ERC-4626). supply() and borrow() accept either an assets amount OR a shares amount, but not both simultaneously. One must be zero. The conversion between shares and assets changes as interest accrues.
• Oracle price uses 36-decimal scaling -- Morpho Blue oracles return price with 36 + loanTokenDecimals - collateralTokenDecimals decimals of precision. This is NOT 18 decimals. Getting this wrong causes catastrophic mispricing. A WETH/USDC oracle returns price with 36 + 6 - 18 = 24 decimals.
• Markets are immutable once created -- After createMarket(), the parameters (oracle, IRM, LLTV) can never be changed. There is no governance. If the oracle breaks, the market is permanently affected.
• liquidate() uses seizedAssets OR repaidShares, not both -- Pass one and set the other to zero. The contract calculates the counterpart. Passing both nonzero reverts.
• Authorization is per-address, not per-market -- setAuthorization(address, bool) grants or revokes permission for an address to act on behalf of msg.sender across ALL markets, not a specific one.

Quick Start

Installation

npm install viem

Morpho Blue has no SDK package to install. Interaction is via the singleton contract ABI directly.

Minimal ABI Fragments

const morphoAbi = [
  {
    name: "supply",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      {
        name: "marketParams",
        type: "tuple",
        components: [
          { name: "loanToken", type: "address" },
          { name: "collateralToken", type: "address" },
          { name: "oracle", type: "address" },
          { name: "irm", type: "address" },
          { name: "lltv", type: "uint256" },
        ],
      },
      { name: "assets", type: "uint256" },
      { name: "shares", type: "uint256" },
      { name: "onBehalf", type: "address" },
      { name: "data", type: "bytes" },
    ],
    outputs: [
      { name: "assetsSupplied", type: "uint256" },
      { name: "sharesSupplied", type: "uint256" },
    ],
  },
  {
    name: "withdraw",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      {
        name: "marketParams",
        type: "tuple",
        components: [
          { name: "loanToken", type: "address" },
          { name: "collateralToken", type: "address" },
          { name: "oracle", type: "address" },
          { name: "irm", type: "address" },
          { name: "lltv", type: "uint256" },
        ],
      },
      { name: "assets", type: "uint256" },
      { name: "shares", type: "uint256" },
      { name: "onBehalf", type: "address" },
      { name: "receiver", type: "address" },
    ],
    outputs: [
      { name: "assetsWithdrawn", type: "uint256" },
      { name: "sharesWithdrawn", type: "uint256" },
    ],
  },
  {
    name: "borrow",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      {
        name: "marketParams",
        type: "tuple",
        components: [
          { name: "loanToken", type: "address" },
          { name: "collateralToken", type: "address" },
          { name: "oracle", type: "address" },
          { name: "irm", type: "address" },
          { name: "lltv", type: "uint256" },
        ],
      },
      { name: "assets", type: "uint256" },
      { name: "shares", type: "uint256" },
      { name: "onBehalf", type: "address" },
      { name: "receiver", type: "address" },
    ],
    outputs: [
      { name: "assetsBorrowed", type: "uint256" },
      { name: "sharesBorrowed", type: "uint256" },
    ],
  },
  {
    name: "repay",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      {
        name: "marketParams",
        type: "tuple",
        components: [
          { name: "loanToken", type: "address" },
          { name: "collateralToken", type: "address" },
          { name: "oracle", type: "address" },
          { name: "irm", type: "address" },
          { name: "lltv", type: "uint256" },
        ],
      },
      { name: "assets", type: "uint256" },
      { name: "shares", type: "uint256" },
      { name: "onBehalf", type: "address" },
      { name: "data", type: "bytes" },
    ],
    outputs: [
      { name: "assetsRepaid", type: "uint256" },
      { name: "sharesRepaid", type: "uint256" },
    ],
  },
  {
    name: "supplyCollateral",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      {
        name: "marketParams",
        type: "tuple",
        components: [
          { name: "loanToken", type: "address" },
          { name: "collateralToken", type: "address" },
          { name: "oracle", type: "address" },
          { name: "irm", type: "address" },
          { name: "lltv", type: "uint256" },
        ],
      },
      { name: "assets", type: "uint256" },
      { name: "onBehalf", type: "address" },
      { name: "data", type: "bytes" },
    ],
    outputs: [],
  },
  {
    name: "withdrawCollateral",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      {
        name: "marketParams",
        type: "tuple",
        components: [
          { name: "loanToken", type: "address" },
          { name: "collateralToken", type: "address" },
          { name: "oracle", type: "address" },
          { name: "irm", type: "address" },
          { name: "lltv", type: "uint256" },
        ],
      },
      { name: "assets", type: "uint256" },
      { name: "onBehalf", type: "address" },
      { name: "receiver", type: "address" },
    ],
    outputs: [],
  },
  {
    name: "liquidate",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      {
        name: "marketParams",
        type: "tuple",
        components: [
          { name: "loanToken", type: "address" },
          { name: "collateralToken", type: "address" },
          { name: "oracle", type: "address" },
          { name: "irm", type: "address" },
          { name: "lltv", type: "uint256" },
        ],
      },
      { name: "borrower", type: "address" },
      { name: "seizedAssets", type: "uint256" },
      { name: "repaidShares", type: "uint256" },
      { name: "data", type: "bytes" },
    ],
    outputs: [
      { name: "seizedAssets", type: "uint256" },
      { name: "repaidAssets", type: "uint256" },
    ],
  },
  {
    name: "createMarket",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      {
        name: "marketParams",
        type: "tuple",
        components: [
          { name: "loanToken", type: "address" },
          { name: "collateralToken", type: "address" },
          { name: "oracle", type: "address" },
          { name: "irm", type: "address" },
          { name: "lltv", type: "uint256" },
        ],
      },
    ],
    outputs: [],
  },
  {
    name: "setAuthorization",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      { name: "authorized", type: "address" },
      { name: "newIsAuthorized", type: "bool" },
    ],
    outputs: [],
  },
  {
    name: "accrueInterest",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      {
        name: "marketParams",
        type: "tuple",
        components: [
          { name: "loanToken", type: "address" },
          { name: "collateralToken", type: "address" },
          { name: "oracle", type: "address" },
          { name: "irm", type: "address" },
          { name: "lltv", type: "uint256" },
        ],
      },
    ],
    outputs: [],
  },
  {
    name: "market",
    type: "function",
    stateMutability: "view",
    inputs: [{ name: "id", type: "bytes32" }],
    outputs: [
      { name: "totalSupplyAssets", type: "uint128" },
      { name: "totalSupplyShares", type: "uint128" },
      { name: "totalBorrowAssets", type: "uint128" },
      { name: "totalBorrowShares", type: "uint128" },
      { name: "lastUpdate", type: "uint128" },
      { name: "fee", type: "uint128" },
    ],
  },
  {
    name: "position",
    type: "function",
    stateMutability: "view",
    inputs: [
      { name: "id", type: "bytes32" },
      { name: "user", type: "address" },
    ],
    outputs: [
      { name: "supplyShares", type: "uint256" },
      { name: "borrowShares", type: "uint128" },
      { name: "collateral", type: "uint128" },
    ],
  },
  {
    name: "idToMarketParams",
    type: "function",
    stateMutability: "view",
    inputs: [{ name: "id", type: "bytes32" }],
    outputs: [
      {
        name: "",
        type: "tuple",
        components: [
          { name: "loanToken", type: "address" },
          { name: "collateralToken", type: "address" },
          { name: "oracle", type: "address" },
          { name: "irm", type: "address" },
          { name: "lltv", type: "uint256" },
        ],
      },
    ],
  },
] as const;
 
const erc20Abi = [
  {
    name: "approve",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      { name: "spender", type: "address" },
      { name: "amount", type: "uint256" },
    ],
    outputs: [{ name: "", type: "bool" }],
  },
  {
    name: "balanceOf",
    type: "function",
    stateMutability: "view",
    inputs: [{ name: "account", type: "address" }],
    outputs: [{ name: "", type: "uint256" }],
  },
] as const;

Supply USDC to a Morpho Blue Market (TypeScript)

import { createPublicClient, createWalletClient, http, parseUnits, encodeAbiParameters, keccak256 } from "viem";
import { privateKeyToAccount } from "viem/accounts";
import { mainnet } from "viem/chains";
 
const MORPHO = "0xBBBBBbbBBb9cC5e90e3b3Af64bdAF62C37EEFFCb" as const;
const USDC = "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48" as const;
 
const account = privateKeyToAccount(process.env.PRIVATE_KEY as `0x${string}`);
 
const publicClient = createPublicClient({
  chain: mainnet,
  transport: http(process.env.RPC_URL),
});
 
const walletClient = createWalletClient({
  account,
  chain: mainnet,
  transport: http(process.env.RPC_URL),
});
 
// USDC/wstETH market params (example)
const marketParams = {
  loanToken: USDC,
  collateralToken: "0x7f39C581F595B53c5cb19bD0b3f8dA6c935E2Ca0" as `0x${string}`, // wstETH
  oracle: "0x48F7E36EB6B826B2dF4B2E630B62Cd25e89E40e2" as `0x${string}`,
  irm: "0x870aC11D48B15DB9a138Cf899d20F13F79Ba00BC" as `0x${string}`, // AdaptiveCurveIRM
  lltv: 860000000000000000n, // 86%
} as const;
 
const amount = parseUnits("1000", 6); // 1000 USDC
 
// Approve Morpho to spend USDC
const approveHash = await walletClient.writeContract({
  address: USDC,
  abi: erc20Abi,
  functionName: "approve",
  args: [MORPHO, amount],
});
await publicClient.waitForTransactionReceipt({ hash: approveHash });
 
// Supply USDC -- pass assets amount, set shares to 0
const supplyHash = await walletClient.writeContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "supply",
  args: [marketParams, amount, 0n, account.address, "0x"],
});
const receipt = await publicClient.waitForTransactionReceipt({ hash: supplyHash });
 
if (receipt.status !== "success") {
  throw new Error("Supply transaction reverted");
}

Core Architecture

Singleton Contract

All Morpho Blue markets live inside one immutable contract:

0xBBBBBbbBBb9cC5e90e3b3Af64bdAF62C37EEFFCb

There are no proxy patterns, no admin functions, no upgradeability. The contract is deployed and final.

MarketParams

Every market is defined by exactly five parameters:

type MarketParams = {
  loanToken: `0x${string}`;        // Token being lent and borrowed
  collateralToken: `0x${string}`;  // Token used as collateral
  oracle: `0x${string}`;           // Oracle contract for price feed
  irm: `0x${string}`;             // Interest Rate Model contract
  lltv: bigint;                    // Liquidation LTV (18 decimals, e.g. 0.86e18 = 86%)
};

Market ID Derivation

The market ID is a bytes32 computed deterministically from MarketParams:

import { encodeAbiParameters, keccak256 } from "viem";
 
function computeMarketId(params: MarketParams): `0x${string}` {
  const encoded = encodeAbiParameters(
    [
      { type: "address" }, // loanToken
      { type: "address" }, // collateralToken
      { type: "address" }, // oracle
      { type: "address" }, // irm
      { type: "uint256" }, // lltv
    ],
    [
      params.loanToken,
      params.collateralToken,
      params.oracle,
      params.irm,
      params.lltv,
    ]
  );
  return keccak256(encoded);
}

Equivalent Solidity:

bytes32 marketId = keccak256(abi.encode(
    marketParams.loanToken,
    marketParams.collateralToken,
    marketParams.oracle,
    marketParams.irm,
    marketParams.lltv
));

Authorization

Morpho uses a simple authorization model. You can authorize another address to act on your behalf across all markets:

// Authorize the Morpho Bundler to manage positions on your behalf
const authHash = await walletClient.writeContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "setAuthorization",
  args: ["0x4095F064B8d3c3548A3bebfd0Bbfd04750E30077" as `0x${string}`, true],
});
await publicClient.waitForTransactionReceipt({ hash: authHash });

Market Creation

Anyone can create a market. There are no fees, no governance approvals, and no caps on market creation.

Prerequisites

1. Oracle must implement IOracle (single function: price() returns (uint256))
2. IRM must be enabled by Morpho governance via enableIrm(address)
3. LLTV must be enabled by Morpho governance via enableLltv(uint256)

Create a New Market

// Oracle must be deployed and returning valid prices
// IRM and LLTV must be governance-approved
const newMarketParams = {
  loanToken: "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48" as `0x${string}`,  // USDC
  collateralToken: "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2" as `0x${string}`, // WETH
  oracle: "0x..." as `0x${string}`, // Your deployed oracle
  irm: "0x870aC11D48B15DB9a138Cf899d20F13F79Ba00BC" as `0x${string}`, // AdaptiveCurveIRM
  lltv: 860000000000000000n, // 86% -- must be governance-enabled
} as const;
 
const createHash = await walletClient.writeContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "createMarket",
  args: [newMarketParams],
});
const createReceipt = await publicClient.waitForTransactionReceipt({ hash: createHash });
 
if (createReceipt.status !== "success") {
  throw new Error("createMarket reverted");
}
 
// Compute the market ID for future reference
const marketId = computeMarketId(newMarketParams);
console.log(`Market created with ID: ${marketId}`);

Governance-Enabled LLTVs

Morpho governance has enabled a specific set of LLTVs. Using a non-enabled LLTV will revert createMarket().

Create Market (Solidity)

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;
 
import {IMorpho, MarketParams} from "@morpho-org/morpho-blue/src/interfaces/IMorpho.sol";
 
contract MarketCreator {
    IMorpho public immutable morpho;
 
    constructor(address _morpho) {
        morpho = IMorpho(_morpho);
    }
 
    /// @notice Create a new Morpho Blue market
    /// @dev IRM and LLTV must be governance-enabled or this reverts
    function createNewMarket(MarketParams calldata params) external {
        morpho.createMarket(params);
    }
}

Supply and Withdraw

Supply Loan Token (Lender Side)

Supplying means depositing loan tokens into a market to earn interest from borrowers.

// Supply 5000 USDC to earn yield
const supplyAmount = parseUnits("5000", 6);
 
const approveHash = await walletClient.writeContract({
  address: USDC,
  abi: erc20Abi,
  functionName: "approve",
  args: [MORPHO, supplyAmount],
});
await publicClient.waitForTransactionReceipt({ hash: approveHash });
 
// assets = amount to supply, shares = 0 (let contract calculate shares)
const { result } = await publicClient.simulateContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "supply",
  args: [marketParams, supplyAmount, 0n, account.address, "0x"],
  account: account.address,
});
 
const [assetsSupplied, sharesReceived] = result;
 
const supplyHash = await walletClient.writeContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "supply",
  args: [marketParams, supplyAmount, 0n, account.address, "0x"],
});
const supplyReceipt = await publicClient.waitForTransactionReceipt({ hash: supplyHash });
 
if (supplyReceipt.status !== "success") {
  throw new Error("Supply reverted");
}

Withdraw

// Withdraw all supply shares -- pass shares amount, set assets to 0
const position = await publicClient.readContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "position",
  args: [marketId, account.address],
});
const supplyShares = position[0]; // supplyShares
 
const withdrawHash = await walletClient.writeContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "withdraw",
  args: [marketParams, 0n, supplyShares, account.address, account.address],
});
const withdrawReceipt = await publicClient.waitForTransactionReceipt({ hash: withdrawHash });
 
if (withdrawReceipt.status !== "success") {
  throw new Error("Withdraw reverted");
}

Shares vs Assets

Every supply/withdraw/borrow/repay function takes both assets and shares. Set one to zero and the other to the desired amount.

Setting both nonzero reverts. Passing both as zero does nothing.

Borrow and Repay

Supply Collateral + Borrow

const WETH = "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2" as const;
const collateralAmount = parseUnits("2", 18); // 2 WETH
const borrowAmount = parseUnits("3000", 6); // 3000 USDC
 
// 1. Approve collateral token
const approveCollateralHash = await walletClient.writeContract({
  address: WETH,
  abi: erc20Abi,
  functionName: "approve",
  args: [MORPHO, collateralAmount],
});
await publicClient.waitForTransactionReceipt({ hash: approveCollateralHash });
 
// 2. Supply collateral (separate function from supply)
const collateralHash = await walletClient.writeContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "supplyCollateral",
  args: [marketParams, collateralAmount, account.address, "0x"],
});
const collateralReceipt = await publicClient.waitForTransactionReceipt({ hash: collateralHash });
 
if (collateralReceipt.status !== "success") {
  throw new Error("Supply collateral reverted");
}
 
// 3. Borrow loan token -- assets = borrow amount, shares = 0
const borrowHash = await walletClient.writeContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "borrow",
  args: [marketParams, borrowAmount, 0n, account.address, account.address],
});
const borrowReceipt = await publicClient.waitForTransactionReceipt({ hash: borrowHash });
 
if (borrowReceipt.status !== "success") {
  throw new Error("Borrow reverted");
}

Repay Debt

const repayAmount = parseUnits("3000", 6);
 
// Approve loan token for repayment
const approveRepayHash = await walletClient.writeContract({
  address: USDC,
  abi: erc20Abi,
  functionName: "approve",
  args: [MORPHO, repayAmount],
});
await publicClient.waitForTransactionReceipt({ hash: approveRepayHash });
 
// Repay by assets (exact amount) -- set shares to 0
const repayHash = await walletClient.writeContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "repay",
  args: [marketParams, repayAmount, 0n, account.address, "0x"],
});
const repayReceipt = await publicClient.waitForTransactionReceipt({ hash: repayHash });
 
if (repayReceipt.status !== "success") {
  throw new Error("Repay reverted");
}

Repay Full Debt and Withdraw Collateral

// Get current borrow shares to repay everything
const pos = await publicClient.readContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "position",
  args: [marketId, account.address],
});
const borrowShares = pos[1]; // borrowShares
const collateral = pos[2]; // collateral
 
// Accrue interest first to get accurate share-to-asset conversion
const accrueHash = await walletClient.writeContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "accrueInterest",
  args: [marketParams],
});
await publicClient.waitForTransactionReceipt({ hash: accrueHash });
 
// Repay all debt by shares -- set assets to 0
// Need to approve enough loan tokens (slightly over-approve for interest)
const overApproveAmount = parseUnits("10000", 6);
const approveFullHash = await walletClient.writeContract({
  address: USDC,
  abi: erc20Abi,
  functionName: "approve",
  args: [MORPHO, overApproveAmount],
});
await publicClient.waitForTransactionReceipt({ hash: approveFullHash });
 
const repayAllHash = await walletClient.writeContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "repay",
  args: [marketParams, 0n, borrowShares, account.address, "0x"],
});
await publicClient.waitForTransactionReceipt({ hash: repayAllHash });
 
// Withdraw all collateral
const withdrawCollateralHash = await walletClient.writeContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "withdrawCollateral",
  args: [marketParams, collateral, account.address, account.address],
});
const wcReceipt = await publicClient.waitForTransactionReceipt({ hash: withdrawCollateralHash });
 
if (wcReceipt.status !== "success") {
  throw new Error("Withdraw collateral reverted");
}

Liquidation

A position is liquidatable when borrowed / (collateral * oraclePrice) > LLTV. Liquidators repay part of the borrower's debt and seize their collateral at a discount.

Liquidation Incentive

The liquidation incentive factor (LIF) determines how much collateral the liquidator receives per unit of debt repaid:

LIF = min(maxLIF, 1 / (1 - cursor * (1 - LLTV)))

Where cursor = 0.3 and maxLIF = 1.15 are protocol constants.

Liquidate a Position

const borrowerAddress = "0x...BORROWER..." as `0x${string}`;
 
// Option A: specify seized collateral assets, let contract compute repaid shares
const liqHash = await walletClient.writeContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "liquidate",
  args: [
    marketParams,
    borrowerAddress,
    parseUnits("1", 18), // seize 1 WETH of collateral
    0n,                   // repaidShares = 0 (contract calculates)
    "0x",
  ],
});
 
// Option B: specify repaid debt shares, let contract compute seized assets
const liqHash2 = await walletClient.writeContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "liquidate",
  args: [
    marketParams,
    borrowerAddress,
    0n,                    // seizedAssets = 0 (contract calculates)
    1000000000000000000n,  // repaid shares amount
    "0x",
  ],
});

Bad Debt Handling

When a position's collateral is worth less than its debt, full liquidation creates bad debt. Morpho Blue socializes bad debt across all suppliers in that market by reducing total supply shares proportionally. There is no insurance fund.

Liquidation (Solidity)

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;
 
import {IMorpho, MarketParams} from "@morpho-org/morpho-blue/src/interfaces/IMorpho.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
 
contract MorphoLiquidator {
    IMorpho public immutable morpho;
 
    constructor(address _morpho) {
        morpho = IMorpho(_morpho);
    }
 
    /// @notice Liquidate a borrower by specifying collateral to seize
    /// @dev Caller must have approved loanToken to this contract
    /// @param params Market parameters identifying the market
    /// @param borrower Address of the undercollateralized borrower
    /// @param seizedAssets Amount of collateral to seize (in collateral token decimals)
    function liquidateByCollateral(
        MarketParams calldata params,
        address borrower,
        uint256 seizedAssets
    ) external {
        // Pull loan tokens from caller to repay borrower's debt
        // Exact amount needed is unknown upfront -- approve generously
        IERC20(params.loanToken).transferFrom(msg.sender, address(this), type(uint256).max);
        IERC20(params.loanToken).approve(address(morpho), type(uint256).max);
 
        (uint256 seized, uint256 repaid) = morpho.liquidate(
            params,
            borrower,
            seizedAssets,
            0, // repaidShares = 0 -- seizedAssets determines repayment
            ""
        );
 
        // Return unused loan tokens and seized collateral to caller
        IERC20(params.loanToken).transfer(msg.sender, IERC20(params.loanToken).balanceOf(address(this)));
        IERC20(params.collateralToken).transfer(msg.sender, seized);
    }
}

MetaMorpho Vaults

MetaMorpho vaults are ERC-4626 compliant vaults that allocate deposited assets across multiple Morpho Blue markets. A curator manages the allocation strategy. Depositors receive vault shares representing their proportional claim.

Vault Architecture

Depositor -> MetaMorpho Vault -> Morpho Blue Market 1
                               -> Morpho Blue Market 2
                               -> Morpho Blue Market 3

Deposit into a MetaMorpho Vault

// ERC-4626 interface
const vaultAbi = [
  {
    name: "deposit",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      { name: "assets", type: "uint256" },
      { name: "receiver", type: "address" },
    ],
    outputs: [{ name: "shares", type: "uint256" }],
  },
  {
    name: "withdraw",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      { name: "assets", type: "uint256" },
      { name: "receiver", type: "address" },
      { name: "owner", type: "address" },
    ],
    outputs: [{ name: "shares", type: "uint256" }],
  },
  {
    name: "redeem",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      { name: "shares", type: "uint256" },
      { name: "receiver", type: "address" },
      { name: "owner", type: "address" },
    ],
    outputs: [{ name: "assets", type: "uint256" }],
  },
  {
    name: "totalAssets",
    type: "function",
    stateMutability: "view",
    inputs: [],
    outputs: [{ name: "", type: "uint256" }],
  },
  {
    name: "convertToAssets",
    type: "function",
    stateMutability: "view",
    inputs: [{ name: "shares", type: "uint256" }],
    outputs: [{ name: "", type: "uint256" }],
  },
  {
    name: "convertToShares",
    type: "function",
    stateMutability: "view",
    inputs: [{ name: "assets", type: "uint256" }],
    outputs: [{ name: "", type: "uint256" }],
  },
  {
    name: "maxDeposit",
    type: "function",
    stateMutability: "view",
    inputs: [{ name: "receiver", type: "address" }],
    outputs: [{ name: "", type: "uint256" }],
  },
] as const;
 
// Steakhouse USDC vault (example)
const VAULT = "0xBEEF01735c132Ada46AA9aA9B6290e7a2CE81cd" as `0x${string}`;
const depositAmount = parseUnits("10000", 6); // 10,000 USDC
 
// Check deposit cap
const maxDeposit = await publicClient.readContract({
  address: VAULT,
  abi: vaultAbi,
  functionName: "maxDeposit",
  args: [account.address],
});
 
if (depositAmount > maxDeposit) {
  throw new Error(`Deposit exceeds vault cap. Max: ${maxDeposit}`);
}
 
// Approve vault to spend USDC
const approveVaultHash = await walletClient.writeContract({
  address: USDC,
  abi: erc20Abi,
  functionName: "approve",
  args: [VAULT, depositAmount],
});
await publicClient.waitForTransactionReceipt({ hash: approveVaultHash });
 
// Deposit into vault
const depositHash = await walletClient.writeContract({
  address: VAULT,
  abi: vaultAbi,
  functionName: "deposit",
  args: [depositAmount, account.address],
});
const depositReceipt = await publicClient.waitForTransactionReceipt({ hash: depositHash });
 
if (depositReceipt.status !== "success") {
  throw new Error("Vault deposit reverted");
}

Withdraw from a MetaMorpho Vault

// Withdraw by specifying assets (exact USDC amount to receive)
const withdrawAmount = parseUnits("5000", 6);
 
const vaultWithdrawHash = await walletClient.writeContract({
  address: VAULT,
  abi: vaultAbi,
  functionName: "withdraw",
  args: [withdrawAmount, account.address, account.address],
});
const vaultWithdrawReceipt = await publicClient.waitForTransactionReceipt({ hash: vaultWithdrawHash });
 
if (vaultWithdrawReceipt.status !== "success") {
  throw new Error("Vault withdraw reverted");
}

Vault Roles

Oracles

36-Decimal Price Scaling

Morpho Blue oracles return price with a specific decimal scaling:

priceDecimals = 36 + loanTokenDecimals - collateralTokenDecimals

This ensures the internal math works correctly regardless of token decimal differences.

Oracle Interface

interface IOracle {
    /// @notice Returns the price of 1 unit of collateral token quoted in loan token
    /// @dev Price is scaled to 36 + loanTokenDecimals - collateralTokenDecimals decimals
    function price() external view returns (uint256);
}

Reading Oracle Price

const oracleAbi = [
  {
    name: "price",
    type: "function",
    stateMutability: "view",
    inputs: [],
    outputs: [{ name: "", type: "uint256" }],
  },
] as const;
 
const rawPrice = await publicClient.readContract({
  address: marketParams.oracle,
  abi: oracleAbi,
  functionName: "price",
});
 
// For USDC/WETH market: price has 24 decimals
// Convert to human-readable price of 1 ETH in USDC
const ethPriceUsd = Number(rawPrice) / 1e24;
console.log(`ETH price: $${ethPriceUsd}`);

Morpho Oracle Adapters

Morpho provides oracle adapter contracts that wrap Chainlink feeds into the required 36-decimal format. Use MorphoChainlinkOracleV2 for new deployments.

Interest Rate Model

AdaptiveCurveIRM

Morpho Blue uses an adaptive interest rate model that adjusts rates based on utilization. The model has no governance-controlled parameters -- it self-adjusts.

Key properties:

• Rate increases when utilization is above target (90%)
• Rate decreases when utilization is below target
• Adjustment speed is proportional to distance from target
• The curve is exponential, not linear

Rate Curve Behavior

Utilization < 90%  -> Rate decreases over time
Utilization = 90%  -> Rate stable
Utilization > 90%  -> Rate increases over time

Reading Current Rates

const marketData = await publicClient.readContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "market",
  args: [marketId],
});
 
const [
  totalSupplyAssets,
  totalSupplyShares,
  totalBorrowAssets,
  totalBorrowShares,
  lastUpdate,
  fee,
] = marketData;
 
// Utilization = totalBorrowAssets / totalSupplyAssets
const utilization = totalSupplyAssets > 0n
  ? (totalBorrowAssets * 10000n) / totalSupplyAssets
  : 0n;
 
console.log(`Utilization: ${Number(utilization) / 100}%`);
console.log(`Total supply: ${totalSupplyAssets}`);
console.log(`Total borrow: ${totalBorrowAssets}`);

Contract Addresses

Last verified: February 2026

Core Contracts (Ethereum Mainnet)

Common Token Addresses (Ethereum Mainnet)

Verify any address before mainnet use: cast code <address> --rpc-url $RPC_URL

Reading Protocol State

Get Market Data

const marketId = computeMarketId(marketParams);
 
const marketData = await publicClient.readContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "market",
  args: [marketId],
});
 
const [
  totalSupplyAssets,
  totalSupplyShares,
  totalBorrowAssets,
  totalBorrowShares,
  lastUpdate,
  fee,
] = marketData;
 
console.log(`Total supply: ${totalSupplyAssets}`);
console.log(`Total borrow: ${totalBorrowAssets}`);
// Fee is in WAD (18 decimals), 0 = no fee, 0.1e18 = 10%
console.log(`Fee: ${Number(fee) / 1e18 * 100}%`);

Get User Position

const position = await publicClient.readContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "position",
  args: [marketId, account.address],
});
 
const [supplyShares, borrowShares, collateral] = position;
console.log(`Supply shares: ${supplyShares}`);
console.log(`Borrow shares: ${borrowShares}`);
console.log(`Collateral: ${collateral}`);

Convert Shares to Assets

// To convert supply shares to asset amount:
// assets = shares * totalSupplyAssets / totalSupplyShares
function sharesToAssets(
  shares: bigint,
  totalAssets: bigint,
  totalShares: bigint
): bigint {
  if (totalShares === 0n) return 0n;
  return (shares * totalAssets) / totalShares;
}
 
const supplyAssets = sharesToAssets(
  supplyShares,
  totalSupplyAssets,
  totalSupplyShares
);
console.log(`Supply value: ${supplyAssets}`);

Reverse-Lookup Market Params from ID

const params = await publicClient.readContract({
  address: MORPHO,
  abi: morphoAbi,
  functionName: "idToMarketParams",
  args: [marketId],
});
console.log(`Loan token: ${params.loanToken}`);
console.log(`Collateral token: ${params.collateralToken}`);

Error Handling

import { BaseError, ContractFunctionRevertedError } from "viem";
 
try {
  await publicClient.simulateContract({
    address: MORPHO,
    abi: morphoAbi,
    functionName: "borrow",
    args: [marketParams, parseUnits("1000", 6), 0n, account.address, account.address],
    account: account.address,
  });
} catch (err) {
  if (err instanceof BaseError) {
    const revertError = err.walk(
      (e) => e instanceof ContractFunctionRevertedError
    );
    if (revertError instanceof ContractFunctionRevertedError) {
      const errorName = revertError.data?.errorName;
      console.error(`Morpho revert: ${errorName}`);
    }
  }
}

Security

Position Health Monitoring

Unlike Aave, Morpho Blue does not have a built-in health factor getter. You must compute it manually:

async function isLiquidatable(
  marketParams: MarketParams,
  borrower: `0x${string}`
): Promise<{ liquidatable: boolean; ltv: number }> {
  const marketId = computeMarketId(marketParams);
 
  const [marketData, position, oraclePrice] = await Promise.all([
    publicClient.readContract({
      address: MORPHO,
      abi: morphoAbi,
      functionName: "market",
      args: [marketId],
    }),
    publicClient.readContract({
      address: MORPHO,
      abi: morphoAbi,
      functionName: "position",
      args: [marketId, borrower],
    }),
    publicClient.readContract({
      address: marketParams.oracle,
      abi: [{ name: "price", type: "function", stateMutability: "view", inputs: [], outputs: [{ name: "", type: "uint256" }] }] as const,
      functionName: "price",
    }),
  ]);
 
  const [totalSupplyAssets, totalSupplyShares, totalBorrowAssets, totalBorrowShares] = marketData;
  const [, borrowShares, collateral] = position;
 
  if (borrowShares === 0n) return { liquidatable: false, ltv: 0 };
  if (collateral === 0n) return { liquidatable: true, ltv: Infinity };
 
  // Convert borrow shares to assets
  const borrowAssets = (BigInt(borrowShares) * totalBorrowAssets) / totalBorrowShares;
 
  // collateralValue in loan token terms = collateral * oraclePrice / ORACLE_PRICE_SCALE
  // ORACLE_PRICE_SCALE = 10^(36 + loanDecimals - collateralDecimals)
  const ORACLE_PRICE_SCALE = 10n ** 36n; // simplified for same-decimal tokens; adjust per market
  const collateralValueInLoanToken = (BigInt(collateral) * oraclePrice) / ORACLE_PRICE_SCALE;
 
  const currentLtv = collateralValueInLoanToken > 0n
    ? Number(borrowAssets * 10000n / collateralValueInLoanToken) / 100
    : Infinity;
 
  const lltvPercent = Number(marketParams.lltv) / 1e18 * 100;
 
  return {
    liquidatable: currentLtv >= lltvPercent,
    ltv: currentLtv,
  };
}

Best Practices

1. Simulate before executing -- Always call simulateContract before writeContract to catch reverts without spending gas.
2. Check receipt.status -- A confirmed transaction can still revert. Always verify receipt.status === "success".
3. Monitor position health off-chain -- Set alerts when LTV approaches LLTV. Morpho Blue has no safety buffer built in.
4. Use shares for full repayment -- When repaying all debt, pass borrowShares (not assets) to avoid dust remaining from interest accrual between blocks.
5. Accrue interest before reads -- Call accrueInterest() before reading market state for accurate share-to-asset conversion.
6. Approve exact amounts -- Avoid unlimited approvals in production. Approve only what is needed per transaction.
7. Verify oracle freshness -- Morpho Blue does not validate oracle staleness. If the oracle stops updating, liquidations may execute at stale prices.

References

• Morpho Blue Technical Docs
• Morpho Blue GitHub
• MetaMorpho GitHub
• Morpho Blue Whitepaper
• AdaptiveCurveIRM
• Morpho Oracle Adapters
• Morpho App