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glend

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Mis à jour6 mars 2026 à 19:00

Agent skill for interacting with the Glend DeFi Lend & Borrow protocol by GemachDAO. Supply, borrow, repay, withdraw assets and monitor account health on EVM chains using viem.

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GemachDAO

GemachDAO/glend-skill

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SKILL.md

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name	glend
description	Agent skill for interacting with the Glend DeFi Lend & Borrow protocol by GemachDAO. Supply, borrow, repay, withdraw assets and monitor account health on EVM chains using viem.

Glend Agent Skill

This file provides instructions for AI agents interacting with the Glend DeFi Lend & Borrow platform by GemachDAO.

What is Glend?

Glend is a decentralized lending and borrowing protocol deployed on multiple EVM chains. It runs as an Aave V3 fork on Pharos Testnet and as a Compound V2 fork (gTokens/tTokens) on Ethereum and Base. Agents can:

Supply / Lend — deposit assets to earn interest
Borrow — take loans against supplied collateral
Repay — pay back outstanding debt
Withdraw — reclaim supplied assets (subject to utilization and health factor)
Monitor health — track collateral ratio and liquidation risk

All on-chain interactions are performed with viem. Contract addresses and chain configuration are pre-loaded — agents only need a wallet private key to start.

Glend App: https://glendv2.gemach.io

Environment Variables

AGENT_PRIVATE_KEY=<private_key>     # Agent wallet private key (never commit!)

The only required variable is AGENT_PRIVATE_KEY. All contract addresses, RPC endpoints, and chain configuration are embedded below.

Optional overrides (advanced — use only if connecting to a custom deployment):

GLEND_RPC_URL=<rpc_url>             # Override the default RPC endpoint
GLEND_POOL_ADDRESS=<address>        # Override the default pool contract
GLEND_CHAIN_ID=<chain_id>           # Override the default chain ID

Supported Deployments

Pharos Testnet (default)

Property	Value
Chain ID	`688688`
RPC URL	`https://testnet.dplabs-internal.com`
Block Explorer	`https://testnet.pharosscan.xyz`
Native Token	PHRS
Pool (Lending Pool)	`0xe838eb8011297024bca9c09d4e83e2d3cd74b7d0`
WETHGateway	`0xa8e550710bf113db6a1b38472118b8d6d5176d12`
Faucet	`0x2e9d89d372837f71cb529e5ba85bfbc1785c69cd`

Token Registry — Pharos Testnet

Token	Address	Decimals
USDT	`0x0b00fb1f513e02399667fba50772b21f34c1b5d9`	6
USDC	`0x48249feeb47a8453023f702f15cf00206eebdf08`	6
BTC	`0xa4a967fc7cf0e9815bf5c2700a055813628b65be`	8

Ethereum Mainnet (Compound fork)

Property	Value
Chain ID	`1`
Protocol	Compound V2 fork (tTokens)
RPC URL	`https://eth.llamarpc.com`
Block Explorer	`https://etherscan.io`
Native Token	ETH
Comptroller (Unitroller)	`0x4a4c2A16b58bD63d37e999fDE50C2eBfE3182D58`
PriceOracle	`0x97f602E17ed4e765a6968f295Bdc3F6b4c1Ef93b`
CompoundLens	`0x47bdd2Ebfd5081c72adb4238E04559576F2c9ba3`

Market Tokens — Ethereum Mainnet

Market	Address	Collateral Factor
tUSDT	`0xfd7E506495fd921a17802Cf523279f01550BE8b6`	75%
tUSDC	`0x1C5215F2fb5417BdF9D93339b0caf20222f210f3`	75%
tETH	`0x6baeCC06B2faFD651B095ab3b7882AEe6EC4369D`	80%
tcbBTC	`0xF4faD7E54bF68344906C2b60fBCDB031cdeaDB52`	70%
tstETH	`0x6e9acC9D6ea3edE1acAE7Eeb2Be2dE1F8572Bc82`	78%

Base (Compound fork)

Property	Value
Chain ID	`8453`
Protocol	Compound V2 fork (gTokens)
RPC URL	`https://mainnet.base.org`
Block Explorer	`https://basescan.org`
Native Token	ETH
Comptroller (Unitroller)	`0x4a4c2A16b58bD63d37e999fDE50C2eBfE3182D58`
PriceOracle	`0x97f602E17ed4e765a6968f295Bdc3F6b4c1Ef93b`
CompoundLens	`0x41d9071C885da8dCa042E05AA66D7D5034383C53`

Market Tokens — Base

Market	Address
gUSDT	`0x6eAB9a4f7fDE8C1Ef0F62DA16549C80Bb7b7f853`
gUSDC	`0xfd7E506495fd921a17802Cf523279f01550BE8b6`
gETH	`0x1C5215F2fb5417BdF9D93339b0caf20222f210f3`
gcbBTC	`0x920D3D27b17DCC16A7263d2ab176ac68C8385cd3`

Getting Test Tokens (Faucet)

Before interacting with the lending pool, agents need test tokens. Use the on-chain faucet to mint tokens:

const FAUCET_ABI = [
  {
    name: "mint",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      { name: "_asset", type: "address" },
      { name: "_account", type: "address" },
      { name: "_amount", type: "uint256" },
    ],
    outputs: [],
  },
] as const;

const FAUCET_ADDRESS = "0x2e9d89d372837f71cb529e5ba85bfbc1785c69cd" as const;

async function mintTestTokens(
  tokenAddress: `0x${string}`,
  amount: bigint,
) {
  const hash = await walletClient.writeContract({
    address: FAUCET_ADDRESS,
    abi: FAUCET_ABI,
    functionName: "mint",
    args: [tokenAddress, account.address, amount],
  });
  await publicClient.waitForTransactionReceipt({ hash });
  console.log(`Minted test tokens — tx: ${hash}`);
}

// Example: mint 1000 USDC (6 decimals)
await mintTestTokens("0x48249feeb47a8453023f702f15cf00206eebdf08", parseUnits("1000", 6));

Aave V3 Protocol — Pharos Testnet

All agent operations on Pharos Testnet target the Glend Pool contract (Aave V3 fork). Interact with it via viem's writeContract / readContract.

Minimal ABI (key functions)

export const GLEND_POOL_ABI = [
  // ── Read ──────────────────────────────────────────────────────────────────
  {
    name: "getUserAccountData",
    type: "function",
    stateMutability: "view",
    inputs:  [{ name: "user",  type: "address" }],
    outputs: [
      { name: "totalCollateralBase",     type: "uint256" },
      { name: "totalDebtBase",           type: "uint256" },
      { name: "availableBorrowsBase",    type: "uint256" },
      { name: "currentLiquidationThreshold", type: "uint256" },
      { name: "ltv",                     type: "uint256" },
      { name: "healthFactor",            type: "uint256" },
    ],
  },
  {
    name: "getReserveData",
    type: "function",
    stateMutability: "view",
    inputs:  [{ name: "asset", type: "address" }],
    outputs: [
      { name: "configuration",    type: "uint256" },
      { name: "liquidityIndex",   type: "uint128" },
      { name: "variableBorrowIndex", type: "uint128" },
      { name: "currentLiquidityRate",      type: "uint128" },
      { name: "currentVariableBorrowRate", type: "uint128" },
      { name: "lastUpdateTimestamp",       type: "uint40"  },
      { name: "aTokenAddress",             type: "address" },
      { name: "variableDebtTokenAddress",  type: "address" },
      { name: "interestRateStrategyAddress", type: "address" },
      { name: "id",               type: "uint8"   },
    ],
  },
  // ── Write ─────────────────────────────────────────────────────────────────
  {
    name: "supply",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      { name: "asset",          type: "address" },
      { name: "amount",         type: "uint256" },
      { name: "onBehalfOf",     type: "address" },
      { name: "referralCode",   type: "uint16"  },
    ],
    outputs: [],
  },
  {
    name: "withdraw",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      { name: "asset",      type: "address" },
      { name: "amount",     type: "uint256" },   // use MaxUint256 to withdraw all
      { name: "to",         type: "address" },
    ],
    outputs: [{ name: "", type: "uint256" }],
  },
  {
    name: "borrow",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      { name: "asset",              type: "address" },
      { name: "amount",             type: "uint256" },
      { name: "interestRateMode",   type: "uint256" }, // 2 = variable
      { name: "referralCode",       type: "uint16"  },
      { name: "onBehalfOf",         type: "address" },
    ],
    outputs: [],
  },
  {
    name: "repay",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      { name: "asset",            type: "address" },
      { name: "amount",           type: "uint256" }, // use MaxUint256 to repay all
      { name: "interestRateMode", type: "uint256" }, // 2 = variable
      { name: "onBehalfOf",       type: "address" },
    ],
    outputs: [{ name: "", type: "uint256" }],
  },
] as const;

Agent Operations

1 · Set up viem clients

import {
  createPublicClient,
  createWalletClient,
  http,
  parseUnits,
  formatUnits,
  maxUint256,
  defineChain,
} from "viem";
import { mainnet, base } from "viem/chains";
import { privateKeyToAccount } from "viem/accounts";
import type { Chain } from "viem";

// ── Pharos Testnet chain definition ────────────────────────────────────────
const pharosTestnet = defineChain({
  id: 688688,
  name: "Pharos Testnet",
  nativeCurrency: { name: "PHRS", symbol: "PHRS", decimals: 18 },
  rpcUrls: {
    default: { http: ["https://testnet.dplabs-internal.com"] },
  },
  blockExplorers: {
    default: { name: "Pharos Explorer", url: "https://testnet.pharosscan.xyz" },
  },
  testnet: true,
});

// ── All supported chains ───────────────────────────────────────────────────
const GLEND_CHAINS: Record<number, Chain> = {
  688688: pharosTestnet,
  1: mainnet,
  8453: base,
};

// ── Aave V3 deployment (Pharos Testnet) ────────────────────────────────────
const PHAROS_DEPLOYMENT = {
  pool: "0xe838eb8011297024bca9c09d4e83e2d3cd74b7d0" as `0x${string}`,
  wethGateway: "0xa8e550710bf113db6a1b38472118b8d6d5176d12" as `0x${string}`,
  faucet: "0x2e9d89d372837f71cb529e5ba85bfbc1785c69cd" as `0x${string}`,
  tokens: {
    USDT: { address: "0x0b00fb1f513e02399667fba50772b21f34c1b5d9" as `0x${string}`, decimals: 6 },
    USDC: { address: "0x48249feeb47a8453023f702f15cf00206eebdf08" as `0x${string}`, decimals: 6 },
    BTC:  { address: "0xa4a967fc7cf0e9815bf5c2700a055813628b65be" as `0x${string}`, decimals: 8 },
  },
};

// ── Compound fork deployment (Ethereum Mainnet) ────────────────────────────
const ETH_DEPLOYMENT = {
  comptroller: "0x4a4c2A16b58bD63d37e999fDE50C2eBfE3182D58" as `0x${string}`,
  priceOracle: "0x97f602E17ed4e765a6968f295Bdc3F6b4c1Ef93b" as `0x${string}`,
  compoundLens: "0x47bdd2Ebfd5081c72adb4238E04559576F2c9ba3" as `0x${string}`,
  markets: {
    tUSDT:  { address: "0xfd7E506495fd921a17802Cf523279f01550BE8b6" as `0x${string}` },
    tUSDC:  { address: "0x1C5215F2fb5417BdF9D93339b0caf20222f210f3" as `0x${string}` },
    tETH:   { address: "0x6baeCC06B2faFD651B095ab3b7882AEe6EC4369D" as `0x${string}` },
    tcbBTC: { address: "0xF4faD7E54bF68344906C2b60fBCDB031cdeaDB52" as `0x${string}` },
    tstETH: { address: "0x6e9acC9D6ea3edE1acAE7Eeb2Be2dE1F8572Bc82" as `0x${string}` },
  },
};

// ── Compound fork deployment (Base) ────────────────────────────────────────
const BASE_DEPLOYMENT = {
  comptroller: "0x4a4c2A16b58bD63d37e999fDE50C2eBfE3182D58" as `0x${string}`,
  priceOracle: "0x97f602E17ed4e765a6968f295Bdc3F6b4c1Ef93b" as `0x${string}`,
  compoundLens: "0x41d9071C885da8dCa042E05AA66D7D5034383C53" as `0x${string}`,
  markets: {
    gUSDT:  { address: "0x6eAB9a4f7fDE8C1Ef0F62DA16549C80Bb7b7f853" as `0x${string}` },
    gUSDC:  { address: "0xfd7E506495fd921a17802Cf523279f01550BE8b6" as `0x${string}` },
    gETH:   { address: "0x1C5215F2fb5417BdF9D93339b0caf20222f210f3" as `0x${string}` },
    gcbBTC: { address: "0x920D3D27b17DCC16A7263d2ab176ac68C8385cd3" as `0x${string}` },
  },
};

// ── Resolve configuration ──────────────────────────────────────────────────
const CHAIN_ID    = Number(process.env.GLEND_CHAIN_ID ?? 688688);
const chain       = GLEND_CHAINS[CHAIN_ID];
if (!chain) {
  throw new Error(`Unsupported chain ID: ${CHAIN_ID}. Supported: ${Object.keys(GLEND_CHAINS).join(", ")}`);
}
const RPC_URL     = process.env.GLEND_RPC_URL ?? chain.rpcUrls.default.http[0];
const PRIVATE_KEY = process.env.AGENT_PRIVATE_KEY as `0x${string}`;

const account      = privateKeyToAccount(PRIVATE_KEY);
const publicClient = createPublicClient({ chain, transport: http(RPC_URL) });
const walletClient = createWalletClient({ account, chain, transport: http(RPC_URL) });

// ── Pharos helpers ─────────────────────────────────────────────────────────
const POOL_ADDRESS = (process.env.GLEND_POOL_ADDRESS ?? PHAROS_DEPLOYMENT.pool) as `0x${string}`;

function getToken(symbol: string) {
  const token = PHAROS_DEPLOYMENT.tokens[symbol as keyof typeof PHAROS_DEPLOYMENT.tokens];
  if (!token) throw new Error(`Unknown token: ${symbol}. Available: ${Object.keys(PHAROS_DEPLOYMENT.tokens).join(", ")}`);
  return token;
}

// ── Compound helpers ───────────────────────────────────────────────────────
function getDeployment() {
  if (CHAIN_ID === 1)    return ETH_DEPLOYMENT;
  if (CHAIN_ID === 8453) return BASE_DEPLOYMENT;
  throw new Error(`Chain ${CHAIN_ID} does not have a Compound V2 deployment. Supported: Ethereum (1), Base (8453). For Aave V3, use Pharos (688688).`);
}

function getComptroller(): `0x${string}` {
  const deployment = getDeployment();
  if (!deployment.comptroller) {
    throw new Error(`Comptroller address not configured for chain ${CHAIN_ID}. Market operations (mint, borrow, etc.) still work directly.`);
  }
  return deployment.comptroller;
}

function getMarket(symbol: string) {
  const deployment = getDeployment();
  const market = deployment.markets[symbol as keyof typeof deployment.markets];
  if (!market) throw new Error(`Unknown market: ${symbol}. Available: ${Object.keys(deployment.markets).join(", ")}`);
  return market;
}

2 · Approve ERC-20 before supply or repay

import { erc20Abi } from "viem";

async function approveToken(tokenAddress: `0x${string}`, amount: bigint) {
  const hash = await walletClient.writeContract({
    address: tokenAddress,
    abi: erc20Abi,
    functionName: "approve",
    args: [POOL_ADDRESS, amount],
  });
  await publicClient.waitForTransactionReceipt({ hash });
  console.log("Approved:", hash);
}

3 · Supply (lend) assets

async function supplyAsset(
  tokenAddress: `0x${string}`,
  humanAmount: string,
  decimals: number,
) {
  const amount = parseUnits(humanAmount, decimals);
  await approveToken(tokenAddress, amount);

  const hash = await walletClient.writeContract({
    address: POOL_ADDRESS,
    abi: GLEND_POOL_ABI,
    functionName: "supply",
    args: [tokenAddress, amount, account.address, 0],
  });
  await publicClient.waitForTransactionReceipt({ hash });
  console.log(`Supplied ${humanAmount} — tx: ${hash}`);
}

4 · Borrow assets

async function borrowAsset(
  tokenAddress: `0x${string}`,
  humanAmount: string,
  decimals: number,
) {
  const amount = parseUnits(humanAmount, decimals);
  const hash = await walletClient.writeContract({
    address: POOL_ADDRESS,
    abi: GLEND_POOL_ABI,
    functionName: "borrow",
    args: [tokenAddress, amount, 2n, 0, account.address], // 2 = variable rate
  });
  await publicClient.waitForTransactionReceipt({ hash });
  console.log(`Borrowed ${humanAmount} — tx: ${hash}`);
}

5 · Repay debt

import { erc20Abi } from "viem";

/** Fetch the current variable debt balance for a token. */
async function getDebtBalance(
  variableDebtTokenAddress: `0x${string}`,
  userAddress: `0x${string}`,
): Promise<bigint> {
  return publicClient.readContract({
    address: variableDebtTokenAddress,
    abi: erc20Abi,
    functionName: "balanceOf",
    args: [userAddress],
  });
}

async function repayDebt(
  tokenAddress: `0x${string}`,
  variableDebtTokenAddress: `0x${string}`,
  humanAmount: string | "all",
  decimals: number,
) {
  // Determine the repay amount for the Pool call (maxUint256 = repay all debt)
  const repayAmount = humanAmount === "all" ? maxUint256 : parseUnits(humanAmount, decimals);

  // For the ERC-20 approval, always approve the exact token amount being transferred.
  // When repaying "all", query the live debt balance so the approval is not excessive.
  const approvalAmount =
    humanAmount === "all"
      ? await getDebtBalance(variableDebtTokenAddress, account.address)
      : parseUnits(humanAmount, decimals);

  await approveToken(tokenAddress, approvalAmount);

  const hash = await walletClient.writeContract({
    address: POOL_ADDRESS,
    abi: GLEND_POOL_ABI,
    functionName: "repay",
    args: [tokenAddress, repayAmount, 2n, account.address],
  });
  await publicClient.waitForTransactionReceipt({ hash });
  console.log(`Repaid — tx: ${hash}`);
}

6 · Withdraw supplied assets

async function withdrawAsset(
  tokenAddress: `0x${string}`,
  humanAmount: string | "all",
  decimals: number,
) {
  const amount = humanAmount === "all" ? maxUint256 : parseUnits(humanAmount, decimals);

  const hash = await walletClient.writeContract({
    address: POOL_ADDRESS,
    abi: GLEND_POOL_ABI,
    functionName: "withdraw",
    args: [tokenAddress, amount, account.address],
  });
  await publicClient.waitForTransactionReceipt({ hash });
  console.log(`Withdrew — tx: ${hash}`);
}

7 · Check account health

async function getAccountHealth(userAddress: `0x${string}`) {
  const data = await publicClient.readContract({
    address: POOL_ADDRESS,
    abi: GLEND_POOL_ABI,
    functionName: "getUserAccountData",
    args: [userAddress],
  });

  const [
    totalCollateralBase,
    totalDebtBase,
    availableBorrowsBase,
    currentLiquidationThreshold,
    ltv,
    healthFactor,
  ] = data;

  // healthFactor is scaled by 1e18 — values below 1e18 risk liquidation
  const hf = formatUnits(healthFactor, 18);
  console.log({
    totalCollateral: formatUnits(totalCollateralBase, 8),
    totalDebt:       formatUnits(totalDebtBase, 8),
    availableToBorrow: formatUnits(availableBorrowsBase, 8),
    healthFactor: hf,
    atRisk: Number(hf) < 1.1,
  });

  return { totalCollateralBase, totalDebtBase, availableBorrowsBase, healthFactor };
}

8 · Get reserve (market) data

async function getMarketData(tokenAddress: `0x${string}`) {
  const data = await publicClient.readContract({
    address: POOL_ADDRESS,
    abi: GLEND_POOL_ABI,
    functionName: "getReserveData",
    args: [tokenAddress],
  });

  // Rates are per-second values in ray units (1e27).
  // Annualise using compound-interest: APY = (1 + ratePerSecond)^31_536_000 - 1
  const SECONDS_PER_YEAR = 31_536_000n;
  const RAY = 10n ** 27n;

  function rayToAPY(rayRate: bigint): string {
    // Use floating-point for the exponentiation
    const ratePerSecond = Number(rayRate) / Number(RAY);
    const apy = (Math.pow(1 + ratePerSecond, Number(SECONDS_PER_YEAR)) - 1) * 100;
    return `${apy.toFixed(2)}%`;
  }

  const supplyAPY = rayToAPY(data.currentLiquidityRate);
  const borrowAPY = rayToAPY(data.currentVariableBorrowRate);

  console.log({ supplyAPY, borrowAPY });
  return data;
}

Compound V2 Protocol — Ethereum & Base

On Ethereum Mainnet and Base, Glend uses a Compound V2 fork architecture. Instead of a single Pool contract, agents interact with individual gToken/tToken market contracts and a Comptroller for collateral management.

These ABIs match the standard Compound V2 interface — the same functions used by the Glend front-end at glendv2.gemach.io.

gToken / tToken ABI (Compound V2 CToken interface)

export const GTOKEN_ABI = [
  // ── Supply: approve underlying ERC-20 to gToken, then call mint ──────────
  {
    name: "mint",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [{ name: "mintAmount", type: "uint256" }],
    outputs: [{ name: "", type: "uint256" }], // 0 = success
  },
  // ── Borrow ───────────────────────────────────────────────────────────────
  {
    name: "borrow",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [{ name: "borrowAmount", type: "uint256" }],
    outputs: [{ name: "", type: "uint256" }], // 0 = success
  },
  // ── Repay ────────────────────────────────────────────────────────────────
  {
    name: "repayBorrow",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [{ name: "repayAmount", type: "uint256" }],
    outputs: [{ name: "", type: "uint256" }], // 0 = success
  },
  // ── Withdraw (by underlying amount) ──────────────────────────────────────
  {
    name: "redeemUnderlying",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [{ name: "redeemAmount", type: "uint256" }],
    outputs: [{ name: "", type: "uint256" }], // 0 = success
  },
  // ── Withdraw (by gToken amount) ──────────────────────────────────────────
  {
    name: "redeem",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [{ name: "redeemTokens", type: "uint256" }],
    outputs: [{ name: "", type: "uint256" }], // 0 = success
  },
  // ── Read ──────────────────────────────────────────────────────────────────
  {
    name: "underlying",
    type: "function",
    stateMutability: "view",
    inputs: [],
    outputs: [{ name: "", type: "address" }],
  },
  {
    name: "balanceOf",
    type: "function",
    stateMutability: "view",
    inputs: [{ name: "owner", type: "address" }],
    outputs: [{ name: "", type: "uint256" }],
  },
  {
    name: "balanceOfUnderlying",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [{ name: "owner", type: "address" }],
    outputs: [{ name: "", type: "uint256" }],
  },
  {
    name: "borrowBalanceCurrent",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [{ name: "account", type: "address" }],
    outputs: [{ name: "", type: "uint256" }],
  },
  {
    name: "getAccountSnapshot",
    type: "function",
    stateMutability: "view",
    inputs: [{ name: "account", type: "address" }],
    outputs: [
      { name: "error",           type: "uint256" },
      { name: "tokenBalance",    type: "uint256" },
      { name: "borrowBalance",   type: "uint256" },
      { name: "exchangeRateMantissa", type: "uint256" },
    ],
  },
  {
    name: "exchangeRateCurrent",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [],
    outputs: [{ name: "", type: "uint256" }],
  },
  {
    name: "totalBorrows",
    type: "function",
    stateMutability: "view",
    inputs: [],
    outputs: [{ name: "", type: "uint256" }],
  },
  {
    name: "totalSupply",
    type: "function",
    stateMutability: "view",
    inputs: [],
    outputs: [{ name: "", type: "uint256" }],
  },
  {
    name: "getCash",
    type: "function",
    stateMutability: "view",
    inputs: [],
    outputs: [{ name: "", type: "uint256" }],
  },
  {
    name: "supplyRatePerBlock",
    type: "function",
    stateMutability: "view",
    inputs: [],
    outputs: [{ name: "", type: "uint256" }],
  },
  {
    name: "borrowRatePerBlock",
    type: "function",
    stateMutability: "view",
    inputs: [],
    outputs: [{ name: "", type: "uint256" }],
  },
  {
    name: "decimals",
    type: "function",
    stateMutability: "view",
    inputs: [],
    outputs: [{ name: "", type: "uint8" }],
  },
  {
    name: "symbol",
    type: "function",
    stateMutability: "view",
    inputs: [],
    outputs: [{ name: "", type: "string" }],
  },
] as const;

Comptroller ABI (Compound V2 Comptroller interface)

export const COMPTROLLER_ABI = [
  {
    name: "enterMarkets",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [{ name: "gTokens", type: "address[]" }],
    outputs: [{ name: "", type: "uint256[]" }], // 0 = success for each
  },
  {
    name: "exitMarket",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [{ name: "gTokenAddress", type: "address" }],
    outputs: [{ name: "", type: "uint256" }], // 0 = success
  },
  {
    name: "getAccountLiquidity",
    type: "function",
    stateMutability: "view",
    inputs: [{ name: "account", type: "address" }],
    outputs: [
      { name: "error",     type: "uint256" }, // 0 = no error
      { name: "liquidity",  type: "uint256" }, // excess liquidity (USD, 18 decimals)
      { name: "shortfall",  type: "uint256" }, // shortfall (USD, 18 decimals)
    ],
  },
  {
    name: "markets",
    type: "function",
    stateMutability: "view",
    inputs: [{ name: "gToken", type: "address" }],
    outputs: [
      { name: "isListed", type: "bool" },
      { name: "collateralFactorMantissa", type: "uint256" },
    ],
  },
  {
    name: "getAllMarkets",
    type: "function",
    stateMutability: "view",
    inputs: [],
    outputs: [{ name: "", type: "address[]" }],
  },
  {
    name: "getAssetsIn",
    type: "function",
    stateMutability: "view",
    inputs: [{ name: "account", type: "address" }],
    outputs: [{ name: "", type: "address[]" }],
  },
  {
    name: "oracle",
    type: "function",
    stateMutability: "view",
    inputs: [],
    outputs: [{ name: "", type: "address" }],
  },
] as const;

Compound Agent Operations

1 · Get the underlying token address

async function getUnderlying(gTokenAddress: `0x${string}`): Promise<`0x${string}`> {
  return publicClient.readContract({
    address: gTokenAddress,
    abi: GTOKEN_ABI,
    functionName: "underlying",
  }) as Promise<`0x${string}`>;
}

2 · Enable a market as collateral (enterMarkets)

Before borrowing, the agent must enable supplied markets as collateral via the Comptroller:

// Use the Comptroller address from the deployment config
const COMPTROLLER = getComptroller();

async function enableCollateral(gTokenAddresses: `0x${string}`[]) {
  const hash = await walletClient.writeContract({
    address: COMPTROLLER,
    abi: COMPTROLLER_ABI,
    functionName: "enterMarkets",
    args: [gTokenAddresses],
  });
  await publicClient.waitForTransactionReceipt({ hash });
  console.log(`Enabled collateral — tx: ${hash}`);
}

3 · Supply (mint gTokens)

import { erc20Abi } from "viem";

async function compoundSupply(
  gTokenAddress: `0x${string}`,
  humanAmount: string,
  decimals: number,
) {
  const amount = parseUnits(humanAmount, decimals);
  const underlying = await getUnderlying(gTokenAddress);

  // Approve the underlying token to the gToken contract
  const approveHash = await walletClient.writeContract({
    address: underlying,
    abi: erc20Abi,
    functionName: "approve",
    args: [gTokenAddress, amount],
  });
  await publicClient.waitForTransactionReceipt({ hash: approveHash });

  // Mint gTokens (supply)
  const hash = await walletClient.writeContract({
    address: gTokenAddress,
    abi: GTOKEN_ABI,
    functionName: "mint",
    args: [amount],
  });
  await publicClient.waitForTransactionReceipt({ hash });
  console.log(`Supplied ${humanAmount} — tx: ${hash}`);
}

4 · Borrow

async function compoundBorrow(
  gTokenAddress: `0x${string}`,
  humanAmount: string,
  decimals: number,
) {
  const amount = parseUnits(humanAmount, decimals);
  const hash = await walletClient.writeContract({
    address: gTokenAddress,
    abi: GTOKEN_ABI,
    functionName: "borrow",
    args: [amount],
  });
  await publicClient.waitForTransactionReceipt({ hash });
  console.log(`Borrowed ${humanAmount} — tx: ${hash}`);
}

5 · Repay

async function compoundRepay(
  gTokenAddress: `0x${string}`,
  humanAmount: string,
  decimals: number,
) {
  const amount = parseUnits(humanAmount, decimals);
  const underlying = await getUnderlying(gTokenAddress);

  // Approve the underlying token
  const approveHash = await walletClient.writeContract({
    address: underlying,
    abi: erc20Abi,
    functionName: "approve",
    args: [gTokenAddress, amount],
  });
  await publicClient.waitForTransactionReceipt({ hash: approveHash });

  const hash = await walletClient.writeContract({
    address: gTokenAddress,
    abi: GTOKEN_ABI,
    functionName: "repayBorrow",
    args: [amount],
  });
  await publicClient.waitForTransactionReceipt({ hash });
  console.log(`Repaid ${humanAmount} — tx: ${hash}`);
}

6 · Withdraw (redeem)

async function compoundWithdraw(
  gTokenAddress: `0x${string}`,
  humanAmount: string,
  decimals: number,
) {
  const amount = parseUnits(humanAmount, decimals);
  const hash = await walletClient.writeContract({
    address: gTokenAddress,
    abi: GTOKEN_ABI,
    functionName: "redeemUnderlying",
    args: [amount],
  });
  await publicClient.waitForTransactionReceipt({ hash });
  console.log(`Withdrew ${humanAmount} — tx: ${hash}`);
}

7 · Check account liquidity

async function getCompoundAccountHealth(userAddress: `0x${string}`) {
  const [error, liquidity, shortfall] = await publicClient.readContract({
    address: COMPTROLLER,
    abi: COMPTROLLER_ABI,
    functionName: "getAccountLiquidity",
    args: [userAddress],
  });

  console.log({
    error: Number(error),
    excessLiquidity: formatUnits(liquidity, 18),
    shortfall: formatUnits(shortfall, 18),
    atRisk: shortfall > 0n,
  });

  return { error, liquidity, shortfall };
}

8 · Get market rates

async function getCompoundMarketRates(gTokenAddress: `0x${string}`) {
  const supplyRate = await publicClient.readContract({
    address: gTokenAddress,
    abi: GTOKEN_ABI,
    functionName: "supplyRatePerBlock",
  });
  const borrowRate = await publicClient.readContract({
    address: gTokenAddress,
    abi: GTOKEN_ABI,
    functionName: "borrowRatePerBlock",
  });

  // Convert per-block rate to APY (assuming ~12s blocks, ~2628000 blocks/year)
  const BLOCKS_PER_YEAR = 2_628_000;
  const supplyAPY = (Math.pow(1 + Number(supplyRate) / 1e18, BLOCKS_PER_YEAR) - 1) * 100;
  const borrowAPY = (Math.pow(1 + Number(borrowRate) / 1e18, BLOCKS_PER_YEAR) - 1) * 100;

  console.log({ supplyAPY: `${supplyAPY.toFixed(2)}%`, borrowAPY: `${borrowAPY.toFixed(2)}%` });
  return { supplyRate, borrowRate };
}

Key Safety Rules for Agents

Always check health/liquidity before borrowing — on Aave V3, keep health factor above 1.5; on Compound, ensure liquidity > 0 and shortfall == 0.
Approve the exact amount before supply/mint and repay/repayBorrow; never set an open-ended allowance.
On Aave V3: maxUint256 in repay() means repay all debt — the ERC-20 approval must still use the precise token amount.
On Compound: call enterMarkets() on the Comptroller before borrowing, otherwise supplied assets won't count as collateral.
Simulate transactions with publicClient.simulateContract before sending:

// Aave V3 example
const { request } = await publicClient.simulateContract({
  address: POOL_ADDRESS,
  abi: GLEND_POOL_ABI,
  functionName: "borrow",
  args: [tokenAddress, amount, 2n, 0, account.address],
  account,
});
const hash = await walletClient.writeContract(request);

Wait for receipt before assuming a transaction succeeded.
Never log or commit private keys; read them from environment variables only.
Check return values on Compound — mint, borrow, repayBorrow, and redeem return 0 on success; non-zero means error.

Typical Agent Workflows

Pharos Testnet (Aave V3)

1. mintTestTokens(getToken("USDC").address, parseUnits("1000", 6))
   → get test USDC from faucet

2. getAccountHealth(agentAddress)
   → confirm healthFactor > 1.5 before borrowing

3. supplyAsset(getToken("USDC").address, "1000", 6)
   → deposit 1000 USDC as collateral

4. getAccountHealth(agentAddress)
   → verify collateral registered, check availableBorrowsBase

5. borrowAsset(getToken("USDT").address, "500", 6)
   → borrow 500 USDT against USDC collateral

6. [... use borrowed funds ...]

7. repayDebt(getToken("USDT").address, variableDebtTokenAddress, "all", 6)
   → repay full USDT debt

8. withdrawAsset(getToken("USDC").address, "all", 6)
   → recover USDC collateral

Ethereum & Base (Compound V2)

1. compoundSupply(getMarket("gUSDC").address, "1000", 6)
   → supply 1000 USDC, receive gUSDC tokens

2. enableCollateral([getMarket("gUSDC").address])
   → enable gUSDC as collateral on the Comptroller

3. getCompoundAccountHealth(agentAddress)
   → confirm liquidity > 0 and shortfall == 0

4. compoundBorrow(getMarket("gUSDT").address, "500", 6)
   → borrow 500 USDT against gUSDC collateral

5. [... use borrowed funds ...]

6. compoundRepay(getMarket("gUSDT").address, "500", 6)
   → repay USDT debt

7. compoundWithdraw(getMarket("gUSDC").address, "1000", 6)
   → redeem gUSDC for underlying USDC

Troubleshooting

Aave V3 (Pharos Testnet)

Error	Likely cause	Fix
`CALLER_NOT_IN_WHITELIST`	Protocol access control	Confirm the agent wallet is allowed
`HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD`	Borrow would make account unsafe	Reduce borrow amount
`NO_ACTIVE_RESERVE`	Wrong token address or chain	Use addresses from the Token Registry above
`TRANSFER_AMOUNT_EXCEEDS_BALANCE`	Insufficient token balance	Use the faucet to mint test tokens
ERC-20 allowance error	`approve()` not called first	Call `approveToken()` before supply/repay

Compound V2 (Ethereum & Base)

Error / Return Code	Likely cause	Fix
`mint` returns non-zero	Insufficient balance or allowance	Approve underlying token first
`borrow` returns non-zero	Insufficient collateral	Call `enterMarkets()` or supply more
`COMPTROLLER_REJECTION`	Collateral not enabled	Call `enableCollateral()` before borrowing
`shortfall > 0`	Account is undercollateralized	Repay debt or supply more collateral
`redeemUnderlying` returns non-zero	Withdrawal would cause shortfall	Repay debt first

Resources

Glend App: https://glendv2.gemach.io
Pharos Testnet Explorer: https://testnet.pharosscan.xyz
Ethereum Explorer: https://etherscan.io
Base Explorer: https://basescan.org
GemachDAO: https://github.com/GemachDAO
viem docs: https://viem.sh

name	glend
description	Agent skill for interacting with the Glend DeFi Lend & Borrow protocol by GemachDAO. Supply, borrow, repay, withdraw assets and monitor account health on EVM chains using viem.