Aave Utilities

The Aave Protocol is a decentralized non-custodial liquidity protocol where users can participate as suppliers or borrowers.

Aave Utilities is a JavaScript SDK extending ethers.js for interacting with V2 and V3 of the Aave Protocol, an upgrade to the existing aave-js library.

Installation

Aave utilities are available as npm packages:

The @pollum-io/math-utils package contains methods for formatting raw contract data for usage on a frontend

The @pollum-io/contract-helpers package contains methods for generating transactions based on method and parameter inputs. Can be used to read and write data on the protocol contracts.

// with npm
npm install @pollum-io/contract-helpers @pollum-io/math-utils

// with yarn
yarn add @pollum-io/contract-helpers @pollum-io/math-utils

Compatibility

This library has a peer dependency of ethers v5, and will not work with v6.

To install the correct version, run:

npm install ethers@5

Data Methods

The @aave/contract-helpers and @aave/math-utils packages are utilities to fetch and format smart contract data respectively. This section will guide you to setup and use these packages to query Aave Protocol data.

Data Methods Setup

After installing the aave-utilities packages, it's also recommended to add the Aave Address Book package which will be used in the examples to import contract addresses directly.

To initialize an instance of an @aave/contract-helpers service, an ethers provider is required to pass into the constructor. ethers.js is a library for interacting with Ethereum and other EVM compatible blockchains, our ethers provider instance will serve as an RPC connection to read data from the blockchain.

The two services which will be used for all data fetching methods are:

UiPoolDataProvider: Used for querying reserve and user data
UiIncentiveDataProvider: Used for querying reward emissions and user claimable rewards

The sample code below shows a complete example of initializing and using these services to query Aave protocol data.

Sample Code

import { ethers } from 'ethers';
import {
  UiPoolDataProvider,
  UiIncentiveDataProvider,
  ChainId,
} from '@aave/contract-helpers';
import * as markets from '@bgd-labs/aave-address-book';

// ES5 Alternative imports
//  const {
//    ChainId,
//    UiIncentiveDataProvider,
//    UiPoolDataProvider,
//  } = require('@aave/contract-helpers');
//  const markets = require('@bgd-labs/aave-address-book');
//  const ethers = require('ethers');

// Sample RPC address for querying ETH mainnet
const provider = new ethers.providers.JsonRpcProvider(
  'https://eth-mainnet.public.blastapi.io',
);

// User address to fetch data for, insert address here
const currentAccount = '0x464C71f6c2F760DdA6093dCB91C24c39e5d6e18c';

// View contract used to fetch all reserves data (including market base currency data), and user reserves
// Using Aave V3 Eth Mainnet address for demo
const poolDataProviderContract = new UiPoolDataProvider({
  uiPoolDataProviderAddress: markets.AaveV3Ethereum.UI_POOL_DATA_PROVIDER,
  provider,
  chainId: ChainId.mainnet,
});

// View contract used to fetch all reserve incentives (APRs), and user incentives
// Using Aave V3 Eth Mainnet address for demo
const incentiveDataProviderContract = new UiIncentiveDataProvider({
  uiIncentiveDataProviderAddress:
    markets.AaveV3Ethereum.UI_INCENTIVE_DATA_PROVIDER,
  provider,
  chainId: ChainId.mainnet,
});

async function fetchContractData() {
  // Object containing array of pool reserves and market base currency data
  // { reservesArray, baseCurrencyData }
  const reserves = await poolDataProviderContract.getReservesHumanized({
    lendingPoolAddressProvider: markets.AaveV3Ethereum.POOL_ADDRESSES_PROVIDER,
  });

  // Object containing array or users aave positions and active eMode category
  // { userReserves, userEmodeCategoryId }
  const userReserves = await poolDataProviderContract.getUserReservesHumanized({
    lendingPoolAddressProvider: markets.AaveV3Ethereum.POOL_ADDRESSES_PROVIDER,
    user: currentAccount,
  });

  // Array of incentive tokens with price feed and emission APR
  const reserveIncentives =
    await incentiveDataProviderContract.getReservesIncentivesDataHumanized({
      lendingPoolAddressProvider:
        markets.AaveV3Ethereum.POOL_ADDRESSES_PROVIDER,
    });

  // Dictionary of claimable user incentives
  const userIncentives =
    await incentiveDataProviderContract.getUserReservesIncentivesDataHumanized({
      lendingPoolAddressProvider:
        markets.AaveV3Ethereum.POOL_ADDRESSES_PROVIDER,
      user: currentAccount,
    });

  console.log({ reserves, userReserves, reserveIncentives, userIncentives });
}

fetchContractData();

Markets Data

Once you have successfully completed the Setup instructions and are querying on-chain data, the next step is to format this data into human readable format and compute helpful values. This is done using the formatter functions in the @aave/math-utils package. There are two formatters for market data, one with incentives data, and one without. Examples for both methods are shown below.

The output of these methods is an array of formatted reserve data for each reserve in an Aave market.

formatReserves

formatReserves returns an array of formatted configuration and live usage data for each reserve in an Aave market

Sample Code

import { formatReserves } from '@aave/math-utils';
import dayjs from 'dayjs';

// `reserves` variable here is input from Setup section

const reservesArray = reserves.reservesData;
const baseCurrencyData = reserves.baseCurrencyData;

const currentTimestamp = dayjs().unix();

/*
- @param `reserves` Input from [Fetching Protocol Data](#fetching-protocol-data), `reserves.reservesArray`
- @param `currentTimestamp` Current UNIX timestamp in seconds
- @param `marketReferencePriceInUsd` Input from [Fetching Protocol Data](#fetching-protocol-data), `reserves.baseCurrencyData.marketReferencePriceInUsd`
- @param `marketReferenceCurrencyDecimals` Input from [Fetching Protocol Data](#fetching-protocol-data), `reserves.baseCurrencyData.marketReferenceCurrencyDecimals`
*/
const formattedPoolReserves = formatReserves({
  reserves: reservesArray,
  currentTimestamp,
  marketReferenceCurrencyDecimals:
    baseCurrencyData.marketReferenceCurrencyDecimals,
  marketReferencePriceInUsd: baseCurrencyData.marketReferenceCurrencyPriceInUsd,
});

formatReservesAndIncentives

formatReservesAndIncentives returns an array of formatted configuration and live usage data plus an object with supply, variable borrow, and stable borrow incentives for each reserve in an Aave market

Sample Code

import { formatReservesAndIncentives } from '@aave/math-utils';
import dayjs from 'dayjs';

// 'reserves' and 'reserveIncentives' inputs from Fetching Protocol Data section

const reservesArray = reserves.reservesData;
const baseCurrencyData = reserves.baseCurrencyData;

const currentTimestamp = dayjs().unix();

/*
- @param `reserves` Input from [Fetching Protocol Data](#fetching-protocol-data), `reserves.reservesArray`
- @param `currentTimestamp` Current UNIX timestamp in seconds, Math.floor(Date.now() / 1000)
- @param `marketReferencePriceInUsd` Input from [Fetching Protocol Data](#fetching-protocol-data), `reserves.baseCurrencyData.marketReferencePriceInUsd`
- @param `marketReferenceCurrencyDecimals` Input from [Fetching Protocol Data](#fetching-protocol-data), `reserves.baseCurrencyData.marketReferenceCurrencyDecimals`
- @param `reserveIncentives` Input from [Fetching Protocol Data](#fetching-protocol-data), `reserveIncentives`
*/
const formattedPoolReserves = formatReservesAndIncentives({
  reserves: reservesArray,
  currentTimestamp,
  marketReferenceCurrencyDecimals:
    baseCurrencyData.marketReferenceCurrencyDecimals,
  marketReferencePriceInUsd: baseCurrencyData.marketReferenceCurrencyPriceInUsd,
  reserveIncentives,
});

User Data

Once you have successfully completed the Setup instructions and are querying on-chain data, the next step is to format this data into human readable format and compute cumulative user metrics. This is done using the formatter functions in the @aave/math-utils package. There are two formatters for user data, one with incentives data, and one without. Examples for both methods are shown below.

The output of these methods is an object containing cumulative metrics (healthFactor, totalLiquidity, totalBorrows, etc.) and an array of formatted reserve data plus user holdings (aTokens, debtTokens) for each reserve in an Aave market.

formatUserSummary

Returns formatted summary of Aave user portfolio including: array of holdings, total liquidity, total collateral, total borrows, liquidation threshold, health factor, and available borrowing power

Sample Code

import { formatUserSummary } from '@aave/math-utils';
import dayjs from 'dayjs';

// 'reserves' and 'userReserves' inputs from Setup section

const reservesArray = reserves.reservesData;
const baseCurrencyData = reserves.baseCurrencyData;
const userReservesArray = userReserves.userReserves;

const currentTimestamp = dayjs().unix();

const formattedPoolReserves = formatReserves({
  reserves: reservesArray,
  currentTimestamp,
  marketReferenceCurrencyDecimals:
    baseCurrencyData.marketReferenceCurrencyDecimals,
  marketReferencePriceInUsd: baseCurrencyData.marketReferenceCurrencyPriceInUsd,
});

/*
- @param `currentTimestamp` Current UNIX timestamp in seconds, Math.floor(Date.now() / 1000)
- @param `marketReferencePriceInUsd` Input from [Fetching Protocol Data](#fetching-protocol-data), `reserves.baseCurrencyData.marketReferencePriceInUsd`
- @param `marketReferenceCurrencyDecimals` Input from [Fetching Protocol Data](#fetching-protocol-data), `reserves.baseCurrencyData.marketReferenceCurrencyDecimals`
- @param `userReserves` Input from [Fetching Protocol Data](#fetching-protocol-data), combination of `userReserves.userReserves` and `reserves.reservesArray`
- @param `userEmodeCategoryId` Input from [Fetching Protocol Data](#fetching-protocol-data), `userReserves.userEmodeCategoryId`
*/
const userSummary = formatUserSummary({
  currentTimestamp,
  marketReferencePriceInUsd: baseCurrencyData.marketReferenceCurrencyPriceInUsd,
  marketReferenceCurrencyDecimals:
    baseCurrencyData.marketReferenceCurrencyDecimals,
  userReserves: userReservesArray,
  formattedReserves,
  userEmodeCategoryId: userReserves.userEmodeCategoryId,
});

formatUserSummaryAndIncentives

Returns formatted summary of Aave user portfolio including: array of holdings, total liquidity, total collateral, total borrows, liquidation threshold, health factor, available borrowing power, and dictionary of claimable incentives

Sample Code

import { formatUserSummaryAndIncentives } from '@aave/math-utils';
import dayjs from 'dayjs';

// 'reserves', 'userReserves', 'reserveIncentives', and 'userIncentives' inputs from Setup section

const reservesArray = reserves.reservesData;
const baseCurrencyData = reserves.baseCurrencyData;
const userReservesArray = userReserves.userReserves;

const currentTimestamp = dayjs().unix();

const formattedPoolReserves = formatReserves({
  reserves: reservesArray,
  currentTimestamp,
  marketReferenceCurrencyDecimals:
    baseCurrencyData.marketReferenceCurrencyDecimals,
  marketReferencePriceInUsd: baseCurrencyData.marketReferenceCurrencyPriceInUsd,
});

/*
- @param `currentTimestamp` Current UNIX timestamp in seconds, Math.floor(Date.now() / 1000)
- @param `marketReferencePriceInUsd` Input from [Fetching Protocol Data](#fetching-protocol-data), `reserves.baseCurrencyData.marketReferencePriceInUsd`
- @param `marketReferenceCurrencyDecimals` Input from [Fetching Protocol Data](#fetching-protocol-data), `reserves.baseCurrencyData.marketReferenceCurrencyDecimals`
- @param `userReserves` Input from [Fetching Protocol Data](#fetching-protocol-data), combination of `userReserves.userReserves` and `reserves.reservesArray`
- @param `userEmodeCategoryId` Input from [Fetching Protocol Data](#fetching-protocol-data), `userReserves.userEmodeCategoryId`
- @param `reserveIncentives` Input from [Fetching Protocol Data](#fetching-protocol-data), `reserveIncentives`
- @param `userIncentives` Input from [Fetching Protocol Data](#fetching-protocol-data), `userIncentives`
*/
const userSummary = formatUserSummaryAndIncentives({
  currentTimestamp,
  marketReferencePriceInUsd: baseCurrencyData.marketReferenceCurrencyPriceInUsd,
  marketReferenceCurrencyDecimals:
    baseCurrencyData.marketReferenceCurrencyDecimals,
  userReserves: userReservesArray,
  formattedReserves,
  userEmodeCategoryId: userReserves.userEmodeCategoryId,
  reserveIncentives,
  userIncentives,
});

Transaction Methods

The transaction methods package provides an sdk to interact with Aave Protocol contracts. See ethers.js for instructions on installing setting up an ethers provider

Once initialized this sdk can be used to generate the transaction data needed to perform protocol interactions. If an approval is required, the method will return an array with two transactions, or single transaction if no approval is needed.

Transactions Setup

All transaction methods will return an array of transaction objects of this type:

import { EthereumTransactionTypeExtended } from '@aave/contract-helpers';

To send a transaction from this object:

import { BigNumber, providers } from 'ethers';

function submitTransaction({
  provider: providers.Web3Provider,  // Signing transactions requires a wallet provider, Aave UI currently uses web3-react (https://github.com/NoahZinsmeister/web3-react) for connecting wallets and accessing the wallet provider
  tx: EthereumTransactionTypeExtended
}){
  const extendedTxData = await tx.tx();
  const { from, ...txData } = extendedTxData;
  const signer = provider.getSigner(from);
  const txResponse = await signer.sendTransaction({
    ...txData,
    value: txData.value ? BigNumber.from(txData.value) : undefined,
  });
}

Submitting Transactions

All transaction methods will return an array of transaction objects of the following type:

import { EthereumTransactionTypeExtended } from '@aave/contract-helpers';

To send a transaction from this object:

import { BigNumber, providers } from 'ethers';

function submitTransaction({
  provider: ethers.providers.provider,  // Signing transactions requires a wallet provider
  tx: EthereumTransactionTypeExtended
}){
  const extendedTxData = await tx.tx();
  const { from, ...txData } = extendedTxData;
  const signer = provider.getSigner(from);
  const txResponse = await signer.sendTransaction({
    ...txData,
    value: txData.value ? BigNumber.from(txData.value) : undefined,
  });
}

Pool V3

Transaction methods to perform actions on the V3 Pool contract

supplyBundle

A bundle method for supply, formerly deposit, which supplies the underlying asset into the Pool reserve. For every token that is supplied, a corresponding amount of aTokens is minted.

The bundle method provides the transaction for the action, approval if required (txn or signature request), and callback to generate signed supplyWithPermit txn.

Sample Code

import { PoolBundle } from '@aave/contract-helpers';

const poolBundle = new PoolBundle(provider, {
  POOL: poolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will make the deposit
- @param `reserve` The ethereum address of the reserve
- @param `amount` The amount to be deposited
- @param @optional `onBehalfOf` The ethereum address for which user is depositing. It will default to the user address
*/
const supplyBundle: ActionBundle = await poolBundle.supplyBundle({
  user,
  reserve,
  amount,
  onBehalfOf,
});

// Submit bundle components as shown in #bundle-methods section

</details>

<br />

### supply

Formerly `deposit`, supply the underlying asset into the Pool reserve. For every
token that is supplied, a corresponding amount of aTokens is minted

<details>
  <summary>Sample Code</summary>

```ts
import { Pool } from '@aave/contract-helpers';

const pool = new Pool(provider, {
  POOL: poolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will make the deposit
- @param `reserve` The ethereum address of the reserve
- @param `amount` The amount to be deposited
- @param @optional `onBehalfOf` The ethereum address for which user is depositing. It will default to the user address
*/
const txs: EthereumTransactionTypeExtended[] = await pool.supply({
  user,
  reserve,
  amount,
  onBehalfOf,
});

// If the user has not approved the pool contract to spend their tokens, txs will also contain two transactions: approve and supply. These approval and supply transactions can be submitted just as in V2,OR you can skip the first approval transaction with a gasless signature by using signERC20Approval -> supplyWithPermit which are documented below

// If there is no approval transaction, then supply() can called without the need for an approval or signature

Submit transaction(s) as shown here

signERC20Approval

This method is used to generate the raw signature data to be signed by the user. Once generated, a function is called to trigger a signature request from the users wallet. This signature can be passed a parameter to supplyWithPermit or repayWithPermit in place of an approval transaction.

Note: Not all tokens are compatible with the ERC-2612 permit functionality. You can check the Aave interface config for an updated list of supported tokens by network.

Sample Code

import { Pool } from '@aave/contract-helpers';

const pool = new Pool(provider, {
  POOL: poolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will make the deposit 
- @param `reserve` The ethereum address of the reserve 
- @param `amount` The amount to be deposited 
- @param `deadline` Expiration of signature in seconds, for example, 1 hour = Math.floor(Date.now() / 1000 + 3600).toString()
*/
const dataToSign: string = await pool.signERC20Approval({
  user,
  reserve,
  amount,
  deadline,
});

const signature = await provider.send('eth_signTypedData_v4', [
  currentAccount,
  dataToSign,
]);

// This signature can now be passed into the supplyWithPermit() function below

supplyWithPermit

Same underlying method as supply but uses a signature based approval passed as a parameter.

Sample Code

import { Pool } from '@aave/contract-helpers';

const pool = new Pool(provider, {
  POOL: poolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will make the deposit 
- @param `reserve` The ethereum address of the reserve 
- @param `amount` The amount to be deposited 
- @param `signature` Signature approving Pool to spend user funds, received from signing output data of signERC20Approval()
- @param @optional `onBehalfOf` The ethereum address for which user is depositing. It will default to the user address
*/
const txs: EthereumTransactionTypeExtended[] = await pool.supplyWithPermit({
  user,
  reserve,
  amount,
  signature,
  onBehalfOf,
});

Submit transaction as shown here

borrow (V3)

Borrow an amount of reserve asset.

User must have a collateralized position (i.e. aTokens in their wallet)

Sample Code

import { Pool, InterestRate } from '@aave/contract-helpers';

const pool = new Pool(provider, {
  POOL: poolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that repays 
- @param `reserve` The ethereum address of the reserve on which the user borrowed
- @param `amount` The amount to repay, or (-1) if the user wants to repay everything
- @param `interestRateMode` // Whether the borrow will incur a stable (InterestRate.Stable) or variable (InterestRate.Variable) interest rate
- @param @optional `onBehalfOf` The ethereum address for which user is repaying. It will default to the user address
*/
const txs: EthereumTransactionTypeExtended[] = pool.Borrow({
  user,
  reserve,
  amount,
  interestRateMode,
  onBehalfOf,
});

Submit transaction as shown here

repay (V3)

Repays a borrow on the specific reserve, for the specified amount (or for the whole amount, if (-1) is specified). the target user is defined by onBehalfOf. If there is no repayment on behalf of another account, onBehalfOf must be equal to user

If the Pool is not approved to spend user funds, an approval transaction will also be returned

Sample Code

import { Pool } from '@aave/contract-helpers';

const pool = new Pool(provider, {
  POOL: poolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will make the deposit 
- @param `reserve` The ethereum address of the reserve 
- @param `amount` The amount to be deposited 
- @param `interestRateMode` // Whether stable (InterestRate.Stable) or variable (InterestRate.Variable) debt will be repaid
- @param @optional `onBehalfOf` The ethereum address for which user is depositing. It will default to the user address
*/
const txs: EthereumTransactionTypeExtended[] = await pool.repay({
  user,
  reserve,
  amount,
  interestRateMode,
  onBehalfOf,
});

// If the user has not approved the pool contract to spend their tokens, txs will also contain two transactions: approve and repay. This approval transaction can be submitted just as in V2, OR you approve with a gasless signature by using signERC20Approval -> supplyWithPermit which are documented below

// If there is no approval transaction, then repay() can called without the need for an approval or signature

Submit transaction(s) as shown here

repayWithPermit

Same underlying method as repay but uses a signature based approval passed as a parameter.

Sample Code

import { Pool } from '@aave/contract-helpers';

const pool = new Pool(provider, {
  POOL: poolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will make the deposit 
- @param `reserve` The ethereum address of the reserve 
- @param `amount` The amount to be deposited 
- @param `signature` Signature approving Pool to spend user funds, from signERC20Approval()
- @param @optional `onBehalfOf` The ethereum address for which user is depositing. It will default to the user address
*/
const txs: EthereumTransactionTypeExtended[] = await pool.supplyWithPermit({
  user,
  reserve,
  amount,
  signature,
  onBehalfOf,
});

Submit transaction as shown here

repayWithATokens

Repays a borrow on the specific reserve, for the specified amount, deducting funds from a users aToken balance instead of the underlying balance. To repay the max debt amount or max aToken balance without dust (whichever is lowest), set the amount to -1

There is no need for an approval or signature when repaying with aTokens

Sample Code

import { Pool, InterestRate } from '@aave/contract-helpers';

const pool = new Pool(provider, {
  POOL: poolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will make the deposit 
- @param `amount` The amount to be deposited, -1 to repay max aToken balance or max debt balance without dust (whichever is lowest)
- @param `reserve` The ethereum address of the reserve 
- @param `rateMode` The debt type to repay, stable (InterestRate.Stable) or variable (InterestRate.Variable)
*/
const txs: EthereumTransactionTypeExtended[] = await pool.repayWithATokens({
  user,
  amount,
  reserve,
  reateMode,
});

Submit transaction as shown here

withdraw (V3)

Withdraws the underlying asset of an aToken asset.

Sample Code

import { Pool } from '@aave/contract-helpers';

const pool = new Pool(provider, {
  POOL: poolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will make the deposit 
- @param `reserve` The ethereum address of the reserve 
- @param `amount` The amount to be deposited 
- @param `aTokenAddress` The aToken to redeem for underlying asset
- @param @optional `onBehalfOf` The ethereum address for which user is depositing. It will default to the user address
*/
const txs: EthereumTransactionTypeExtended[] = await pool.withdraw({
  user,
  reserve,
  amount,
  aTokenAddress,
  onBehalfOf,
});

Submit transaction as shown here

swapBorrowRateMode (V3)

Borrowers can use this function to swap between stable and variable borrow rate modes

Sample Code

import { Pool, InterestRate } from '@aave/contract-helpers';

const pool = new Pool(provider, {
  POOL: poolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will make the deposit 
- @param `reserve` The ethereum address of the reserve 
- @param `interestRateMode` The rate mode to swap to, stable (InterestRate.Stable) or variable (InterestRate.Variable) 
*/
const txs: EthereumTransactionTypeExtended[] = await pool.swapBorrowRateMode({
  user,
  reserve,
  amount,
  onBehalfOf,
});

Submit transaction as shown here

setUsageAsCollateral (V3)

Allows depositors to enable or disable a specific deposit as collateral

Sample Code

import { Pool } from '@aave/contract-helpers';

const pool = new Pool(provider, {
  POOL: poolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will make the deposit 
- @param `reserve` The ethereum address of the reserve 
- @param `usageAsCollateral` Boolean, true if the user wants to use the deposit as collateral, false otherwise
*/
const txs: EthereumTransactionTypeExtended[] = await pool.setUsageAsCollateral({
  user,
  reserve,
  usageAsCollateral,
});

Submit transaction as shown here

liquidationCall (V3)

Users can invoke this function to liquidate an undercollateralized position

Sample Code

import { Pool } from '@aave/contract-helpers';

const pool = new Pool(provider, {
  POOL: poolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `liquidator` The ethereum address that will liquidate the position 
- @param `liquidatedUser` The address of the borrower 
- @param `debtReserve` The ethereum address of the principal reserve 
- @param `collateralReserve` The address of the collateral to liquidated 
- @param `purchaseAmount` The amount of principal that the liquidator wants to repay 
- @param @optional `getAToken` Boolean to indicate if the user wants to receive the aToken instead of the asset. Defaults to false
*/
const txs: EthereumTransactionTypeExtended[] = lendingPool.liquidationCall({
  liquidator,
  liquidatedUser,
  debtReserve,
  collateralReserve,
  purchaseAmount,
  getAToken,
});

Submit transaction(s) as shown here

swapCollateral (V3)

Utilizes flashloan to swap to a different collateral asset

Sample Code

import { Pool } from '@aave/contract-helpers';

const pool = new Pool(provider, {
  POOL: poolAddress,
  SWAP_COLLATERAL_ADAPTER: swapCollateralAdapterAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will liquidate the position 
- @param @optional `flash` If the transaction will be executed through a flashloan(true) or will be done directly through the adapters(false). Defaults to false 
- @param `fromAsset` The ethereum address of the asset you want to swap 
- @param `fromAToken` The ethereum address of the aToken of the asset you want to swap 
- @param `toAsset` The ethereum address of the asset you want to swap to (get) 
- @param `fromAmount` The amount you want to swap 
- @param `toAmount` The amount you want to get after the swap 
- @param `maxSlippage` The max slippage that the user accepts in the swap 
- @param @optional `permitSignature` A permit signature of the tx. Only needed when previously signed (Not needed at the moment). 
- @param `swapAll` Bool indicating if the user wants to swap all the current collateral 
- @param @optional `onBehalfOf` The ethereum address for which user is swapping. It will default to the user address 
- @param @optional `referralCode` Integrators are assigned a referral code and can potentially receive rewards. It defaults to 0 (no referrer) 
- @param @optional `useEthPath` Boolean to indicate if the swap will use an ETH path. Defaults to false
*/
const txs: EthereumTransactionTypeExtended[] = await lendingPool.swapCollateral(
  {
    user,
    flash,
    fromAsset,
    fromAToken,
    toAsset,
    fromAmount,
    toAmount,
    maxSlippage,
    permitSignature,
    swapAll,
    onBehalfOf,
    referralCode,
    useEthPath,
  },
);

Submit transaction(s) as shown here

repayWithCollateral (V3)

Allows a borrower to repay the open debt with their collateral

Sample Code

import { Pool } from '@aave/contract-helpers';

const pool = new Pool(provider, {
  POOL: poolAddress,
  REPAY_WITH_COLLATERAL_ADAPTER: repayWithCollateralAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will liquidate the position 
- @param `fromAsset` The ethereum address of the asset you want to repay with (collateral) 
- @param `fromAToken` The ethereum address of the aToken of the asset you want to repay with (collateral) 
- @param `assetToRepay` The ethereum address of the asset you want to repay 
- @param `repayWithAmount` The amount of collateral you want to repay the debt with
- @param `repayAmount` The amount of debt you want to repay 
- @param `permitSignature` A permit signature of the tx. Optional
- @param @optional `repayAllDebt` Bool indicating if the user wants to repay all current debt. Defaults to false 
- @param `rateMode` //Enum indicating the type of the interest rate of the collateral
- @param @optional `onBehalfOf` The ethereum address for which user is swapping. It will default to the user address 
- @param @optional `referralCode` Integrators are assigned a referral code and can potentially receive rewards. It defaults to 0 (no referrer) 
- @param @optional `flash` If the transaction will be executed through a flashloan(true) or will be done directly through the adapters(false). Defaults to false 
- @param @optional `useEthPath` Boolean to indicate if the swap will use an ETH path. Defaults to false
*/
const txs: EthereumTransactionTypeExtended[] =
  await lendingPool.repayWithCollateral({
    user,
    fromAsset,
    fromAToken,
    assetToRepay,
    repayWithAmount,
    repayAmount,
    permitSignature,
    repayAllDebt,
    rateMode,
    onBehalfOf,
    referralCode,
    flash,
    useEthPath,
  });

Submit transaction(s) as shown here

setUserEMode

Function to enable eMode on a user account IF conditions are met:

To enable, pass categoryId of desired eMode (1 = stablecoins), can only be enabled if a users currently borrowed assets are ALL within this eMode category To disable, pass categoryId of 0, can only be disabled if new LTV will not leave user undercollateralized

Sample Code

import { Pool } from '@aave/contract-helpers';

const pool = new Pool(provider, {
  POOL: poolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will make the deposit 
- @param `categoryId` number representing the eMode to switch to, 0 = disable, 1 = stablecoins
*/
const txs: EthereumTransactionTypeExtended[] = await pool.setUserEMode({
  user,
  categoryId,
});

Submit transaction as shown here

Lending Pool V2

Object that contains all the necessary methods to create Aave V2 lending pool transactions

depositBundle

A bundle method for deposit, which supplies the underlying asset into the Pool reserve. For every token that is supplied, a corresponding amount of aTokens is minted.

The bundle method generates the deposit tx data and approval tx data (if required).

Sample Code

import { LendingPoolBundle } from '@aave/contract-helpers';

const lendingPoolBundle = new LendingPoolBundle(provider, {
  LENDING_POOL: lendingPoolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will make the deposit
- @param `reserve` The ethereum address of the reserve
- @param `amount` The amount to be deposited
- @param @optional `onBehalfOf` The ethereum address for which user is depositing. It will default to the user address
*/
const depositBundle: ActionBundle = await lendingPoolBundle.depositBundle({
  user,
  reserve,
  amount,
  onBehalfOf,
});

// Submit bundle components as shown in #bundle-methods section

</details>

<br />

### deposit

Deposits the underlying asset into the reserve. For every token that is
deposited, a corresponding amount of aTokens is minted

<details>
  <summary>Sample Code</summary>

```ts
import { LendingPool } from '@aave/contract-helpers';

const lendingPool = new LendingPool(provider, {
  LENDING_POOL: lendingPoolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will make the deposit
- @param `reserve` The ethereum address of the reserve
- @param `amount` The amount to be deposited
- @param @optional `onBehalfOf` The ethereum address for which user is depositing. It will default to the user address
*/
const txs: EthereumTransactionTypeExtended[] = await lendingPool.deposit({
  user,
  reserve,
  amount,
  onBehalfOf,
});

Submit transaction(s) as shown here

borrow

Borrow an amount of reserve asset.

User must have a collateralized position (i.e. aTokens in their wallet)

Sample Code

import { LendingPool, InterestRate } from '@aave/contract-helpers';

const lendingPool = new LendingPool(provider, {
  LENDING_POOL: lendingPoolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will receive the borrowed amount 
- @param `reserve` The ethereum address of the reserve asset 
- @param `amount` The amount to be borrowed, in human readable units (e.g. 2.5 ETH)
- @param `interestRateMode`//Whether the borrow will incur a stable (InterestRate.Stable) or variable (InterestRate.Variable) interest rate
- @param @optional `debtTokenAddress` The ethereum address of the debt token of the asset you want to borrow. Only needed if the reserve is ETH mock address 
- @param @optional `onBehalfOf` The ethereum address for which user is borrowing. It will default to the user address 
*/
const txs: EthereumTransactionTypeExtended[] = await lendingPool.borrow({
  user,
  reserve,
  amount,
  interestRateMode,
  debtTokenAddress,
  onBehalfOf,
  referralCode,
});

Submit transaction as shown here

repay

Repays a borrow on the specific reserve, for the specified amount (or for the whole amount, if (-1) is specified). the target user is defined by onBehalfOf. If there is no repayment on behalf of another account, onBehalfOf must be equal to user

If the user is not approved, an approval transaction will also be returned

Sample Code

import { LendingPool, InterestRate } from '@aave/contract-helpers';

const lendingPool = new LendingPool(provider, {
  LENDING_POOL: lendingPoolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that repays 
- @param `reserve` The ethereum address of the reserve on which the user borrowed
- @param `amount` The amount to repay, or (-1) if the user wants to repay everything
- @param `interestRateMode` // Whether stable (InterestRate.Stable) or variable (InterestRate.Variable) debt will be repaid
- @param @optional `onBehalfOf` The ethereum address for which user is repaying. It will default to the user address
*/
const txs: EthereumTransactionTypeExtended[] = lendingPool.repay({
  user,
  reserve,
  amount,
  interestRateMode,
  onBehalfOf,
});

Submit transaction(s) as shown here

withdraw

Withdraws the underlying asset of an aToken asset.

Sample Code

import { LendingPool } from '@aave/contract-helpers';

const lendingPool = new LendingPool(provider, {
  LENDING_POOL: lendingPoolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will receive the aTokens 
- @param `reserve` The ethereum address of the reserve asset 
- @param `amount` The amount of aToken being redeemed 
- @param @optional `aTokenAddress` The ethereum address of the aToken. Only needed if the reserve is ETH mock address 
- @param @optional `onBehalfOf` The amount of aToken being redeemed. It will default to the user address
*/
const txs: EthereumTransactionTypeExtended[] = lendingPool.withdraw({
  user,
  reserve,
  amount,
  aTokenAddress,
  onBehalfOf,
});

Submit transaction as shown here

swapBorrowRateMode

Borrowers can use this function to swap between stable and variable borrow rate modes.

Sample Code

import { LendingPool, InterestRate } from '@aave/contract-helpers';

const lendingPool = new LendingPool(provider, {
  LENDING_POOL: lendingPoolAddress,
});

/*
- @param `user` The ethereum address that wants to swap rate modes 
- @param `reserve` The address of the reserve on which the user borrowed 
- @param `interestRateMode` //Whether the borrow will incur a stable (InterestRate.Stable) or variable (InterestRate.Variable) interest rate
*/
const txs: EthereumTransactionTypeExtended[] = lendingPool.swapBorrowRateMode({
  user,
  reserve,
  interestRateMode,
});

Submit transaction as shown here

setUsageAsCollateral

Allows depositors to enable or disable a specific deposit as collateral

Sample Code

import { LendingPool, InterestRate } from '@aave/contract-helpers';

const lendingPool = new LendingPool(provider, {
  LENDING_POOL: lendingPoolAddress,
});

/*
- @param `user` The ethereum address that enables or disables the deposit as collateral
- @param `reserve` The ethereum address of the reserve 
- @param `useAsCollateral` Boolean, true if the user wants to use the deposit as collateral, false otherwise
*/
const txs: EthereumTransactionTypeExtended[] = lendingPool.setUsageAsCollateral(
  {
    user,
    reserve,
    usageAsCollateral,
  },
);

Submit transaction as shown here

liquidationCall

Users can invoke this function to liquidate an undercollateralized position.

Sample Code

import { LendingPool } from '@aave/contract-helpers';

const lendingPool = new LendingPool(provider, {
  LENDING_POOL: lendingPoolAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `liquidator` The ethereum address that will liquidate the position 
- @param `liquidatedUser` The address of the borrower 
- @param `debtReserve` The ethereum address of the principal reserve 
- @param `collateralReserve` The address of the collateral to liquidated 
- @param `purchaseAmount` The amount of principal that the liquidator wants to repay
- @param @optional `getAToken` Boolean to indicate if the user wants to receive the aToken instead of the asset. Defaults to false
*/
const txs: EthereumTransactionTypeExtended[] = lendingPool.liquidationCall({
  liquidator,
  liquidatedUser,
  debtReserve,
  collateralReserve,
  purchaseAmount,
  getAToken,
});

Submit transaction(s) as shown here

swapCollateral

Allows users to swap a collateral to another asset

Sample Code

import {
  LendingPool,
  InterestRate,
  PermitSignature,
} from '@aave/contract-helpers';

const lendingPool = new LendingPool(provider, {
  LENDING_POOL: lendingPoolAddress,
  SWAP_COLLATERAL_ADAPTER: swapCollateralAdapterAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will liquidate the position 
- @param @optional `flash` If the transaction will be executed through a flashloan(true) or will be done directly through the adapters(false). Defaults to false 
- @param `fromAsset` The ethereum address of the asset you want to swap 
- @param `fromAToken` The ethereum address of the aToken of the asset you want to swap
- @param `toAsset` The ethereum address of the asset you want to swap to (get) 
- @param `fromAmount` The amount you want to swap 
- @param `toAmount` The amount you want to get after the swap 
- @param `maxSlippage` The max slippage that the user accepts in the swap 
- @param @optional `permitSignature` A permit signature of the tx. Only needed when previously signed (Not needed at the moment).
- @param `swapAll` Bool indicating if the user wants to swap all the current collateral
- @param @optional `onBehalfOf` The ethereum address for which user is swapping. It will default to the user address
- @param @optional `referralCode` Integrators are assigned a referral code and can potentially receive rewards. It defaults to 0 (no referrer)
- @param @optional `useEthPath` Boolean to indicate if the swap will use an ETH path. Defaults to false
*/
const txs: EthereumTransactionTypeExtended[] = await lendingPool.swapCollateral(
  {
    user,
    flash,
    fromAsset,
    fromAToken,
    toAsset,
    fromAmount,
    toAmount,
    maxSlippage,
    permitSignature,
    swapAll,
    onBehalfOf,
    referralCode,
    useEthPath,
  },
);

Submit transaction(s) as shown here

repayWithCollateral

Allows a borrower to repay the open debt with their collateral

Sample Code

import {
  LendingPool,
  InterestRate,
  PermitSignature,
} from '@aave/contract-helpers';

const lendingPool = new LendingPool(provider, {
  LENDING_POOL: lendingPoolAddress,
  REPAY_WITH_COLLATERAL_ADAPTER: repayWithCollateralAddress,
  WETH_GATEWAY: wethGatewayAddress,
});

/*
- @param `user` The ethereum address that will liquidate the position 
- @param `fromAsset` The ethereum address of the asset you want to repay with (collateral)
- @param `fromAToken` The ethereum address of the aToken of the asset you want to repay with (collateral)
- @param `assetToRepay` The ethereum address of the asset you want to repay 
- @param `repayWithAmount` The amount of collateral you want to repay the debt with
- @param `repayAmount` The amount of debt you want to repay 
- @param `permitSignature` A permit signature of the tx. Optional
- @param @optional `repayAllDebt` Bool indicating if the user wants to repay all current debt. Defaults to false
- @param `rateMode` //Enum indicating the type of the interest rate of the collateral
- @param @optional `onBehalfOf` The ethereum address for which user is swapping. It will default to the user address
- @param @optional `referralCode` Integrators are assigned a referral code and can potentially receive rewards. It defaults to 0 (no referrer)
- @param @optional `flash` If the transaction will be executed through a flashloan(true) or will be done directly through the adapters(false). Defaults to false
- @param @optional `useEthPath` Boolean to indicate if the swap will use an ETH path. Defaults to false
*/
const txs: EthereumTransactionTypeExtended[] =
  await lendingPool.repayWithCollateral({
    user,
    fromAsset,
    fromAToken,
    assetToRepay,
    repayWithAmount,
    repayAmount,
    permitSignature,
    repayAllDebt,
    rateMode,
    onBehalfOf,
    referralCode,
    flash,
    useEthPath,
  });

Submit transaction(s) as shown here

Governance V2

Example of how to use functions of the Aave governance service

import { AaveGovernanceService } from '@aave/contract-helpers';

const httpProvider = new Web3.providers.HttpProvider(
  process.env.ETHEREUM_URL || 'https://kovan.infura.io/v3/<project_id>',
);

const governanceService = new AaveGovernanceService(httpProvider, {
  GOVERNANCE_ADDRESS: aaveGovernanceV2Address,
  GOVERNANCE_HELPER_ADDRESS: aaveGovernanceV2HelperAddress,
  ipfsGateway: IPFS_ENDPOINT,
});

create

Creates a Proposal (needs to be validated by the Proposal Validator)

Sample Code

import { AaveGovernanceService } from '@aave/contract-helpers';

const governanceService = new AaveGovernanceService(rpcProvider, {
  GOVERNANCE_ADDRESS: aaveGovernanceV2Address,
  GOVERNANCE_HELPER_ADDRESS: aaveGovernanceV2HelperAddress,
  ipfsGateway: IPFS_ENDPOINT,
});

/*
- @param `user` The ethereum address that will create the proposal
- @param `targets` list of contracts called by proposal's associated transactions
- @param `values` list of value in wei for each proposal's associated transaction
- @param `signatures` list of function signatures (can be empty) to be used when created the callData
- @param `calldatas` list of calldatas: if associated signature empty, calldata ready, else calldata is arguments
- @param `withDelegatecalls` boolean, true = transaction delegatecalls the target, else calls the target
- @param `ipfsHash` IPFS hash of the proposal
- @param `executor` The ExecutorWithTimelock contract that will execute the proposal: ExecutorType.Short or ExecutorType.Long
*/
const tx = governanceService.create({
  user,
  targets,
  values,
  signatures,
  calldatas,
  withDelegatecalls,
  ipfsHash,
  executor,
});

Submit transaction as shown here

cancel

Cancels a Proposal. Callable by the guardian with relaxed conditions, or by anybody if the conditions of cancellation on the executor are fulfilled

Sample Code

import { AaveGovernanceService } from '@aave/contract-helpers';

const governanceService = new AaveGovernanceService(rpcProvider, {
  GOVERNANCE_ADDRESS: aaveGovernanceV2Address,
  GOVERNANCE_HELPER_ADDRESS: aaveGovernanceV2HelperAddress,
  ipfsGateway: IPFS_ENDPOINT,
});

/*
- @param `user` The ethereum address that will create the proposal
- @param `proposalId` Id of the proposal we want to queue
*/
const tx = governanceService.cancel({ user, proposalId });

Submit transaction as shown here

queue

Queue the proposal (If Proposal Succeeded)

Sample Code

import { AaveGovernanceService } from '@aave/contract-helpers';

const governanceService = new AaveGovernanceService(rpcProvider, {
  GOVERNANCE_ADDRESS: aaveGovernanceV2Address,
  GOVERNANCE_HELPER_ADDRESS: aaveGovernanceV2HelperAddress,
  ipfsGateway: IPFS_ENDPOINT,
});

/*
- @param `user` The ethereum address that will create the proposal
- @param `proposalId` Id of the proposal we want to queue
*/
const tx = governanceService.queue({ user, proposalId });

Submit transaction as shown here

execute

Execute the proposal (If Proposal Queued)

Sample Code

import { AaveGovernanceService } from '@aave/contract-helpers';

const governanceService = new AaveGovernanceService(rpcProvider, {
  GOVERNANCE_ADDRESS: aaveGovernanceV2Address,
  GOVERNANCE_HELPER_ADDRESS: aaveGovernanceV2HelperAddress,
  ipfsGateway: IPFS_ENDPOINT,
});

/*
- @param `user` The ethereum address that will create the proposal
- @param `proposalId` Id of the proposal we want to execute
*/
const tx = governanceService.execute({ user, proposalId });

Submit transaction as shown here

submitVote

Function allowing msg.sender to vote for/against a proposal

Sample Code

import { AaveGovernanceService } from '@aave/contract-helpers';

const governanceService = new AaveGovernanceService(rpcProvider, {
  GOVERNANCE_ADDRESS: aaveGovernanceV2Address,
  GOVERNANCE_HELPER_ADDRESS: aaveGovernanceV2HelperAddress,
  ipfsGateway: IPFS_ENDPOINT,
});

/*
- @param `user` The ethereum address that will create the proposal 
- @param `proposalId` Id of the proposal we want to vote 
- @param `support` Bool indicating if you are voting in favor (true) or against (false)
*/
const tx = governanceService.submitVote({ user, proposalId, support });

Submit transaction as shown here

delegate

Method for the user to delegate voting and proposition power to the chosen address

Sample Code

import { GovernancePowerDelegationTokenService } from '@aave/contract-helpers';

const powerDelegation = new GovernancePowerDelegationTokenService(rpcProvider);

/*
- @param `user` The ethereum address that will create the proposal 
- @param `delegatee` The ethereum address to which the user wants to delegate proposition power and voting power
- @param `governanceToken` The ethereum address of the governance token
*/
const tx = powerDelegation.delegate({ user, delegatee, governanceToken });

Submit transaction as shown here

delegateByType

Method for the user to delegate voting or proposition power to the chosen address

Sample Code

import { GovernancePowerDelegationTokenService } from '@aave/contract-helpers';

const powerDelegation = new GovernancePowerDelegationTokenService(rpcProvider);

/*
- @param `user` The ethereum address that will create the proposal 
- @param `delegatee` The ethereum address to which the user wants to delegate proposition power and voting power
- @param `delegationType` The type of the delegation the user wants to do: voting power ('0') or proposition power ('1')
- @param `governanceToken` The ethereum address of the governance token
*/
const tx = powerDelegation.delegateByType({
  user,
  delegatee,
  delegationType,
  governanceToken,
});

Submit transaction as shown here

Faucets

To use the testnet faucets which are compatible with Aave:

mint

Mint tokens for the usage on the Aave protocol on a test network. The amount of minted tokens is fixed and depends on the token

Sample Code

import { FaucetService } from '@aave/contract-helpers';

const faucetService = new FaucetService(provider, faucetAddress);

/*
- @param `userAddress` The ethereum address of the wallet the minted tokens will go
- @param `reserve` The ethereum address of the token you want to mint 
- @param `tokenSymbol` The symbol of the token you want to mint
*/
const tx = faucet.mint({ userAddress, reserve, tokenSymbol });

Submit transaction as shown here

Credit Delegation

Credit delegation is performed on the debtToken contract through the approveDelegation function, which approves a spender to borrow a specified amount of that token.

Accessing delegated credit is done by passing the delegator address as the onBehalfOf parameter when calling borrow on the Pool (V3) or LendingPool (V2).

approveDelegation

Sample Code

import { BaseDebtToken, ERC20Service } from '@aave/contract-helpers';
import { ethers } from 'ethers';

// Sample public RPC address for querying polygon mainnet
const provider = new ethers.providers.JsonRpcProvider(
  'https://polygon-rpc.com',
);

const delegationServicePolygonV2USDC = new BaseDebtToken(
  provider,
  new ERC20Service(provider), // This parameter will be removed in future utils version
);

const approveDelegation = delegationServicePolygonV2USDC.approveDelegation({
  user: '...', /// delegator
  delegatee: '...',
  debtTokenAddress: '...', // can be any V2 or V3 debt token
  amount: 1, // in decimals of underlying token
});

Submit transaction as shown here

New Transaction Methods

The @aave/contract-helpers package is currently undergoing a refactor to simplify the end-to-end process of building transactions. This section is a work in progress and working and will be updated as new methods are added.

Setup

The samples given below will also use the following packages:

npm i @aave/contract-helpers @bgd-labs/aave-address-book ethers@5

Samples

Getting Started

New transaction methods are accessible from the PoolBundle and LendingPool objects. The following script demonstrates how to initialize these objects and the functions which are available.

const ethers = require("ethers");
const markets = require("@bgd-labs/aave-address-book");
const { PoolBundle, LendingPoolBundle } = require("@aave/contract-helpers");

// Create provider
// Can use custom RPC orR a local fork network from tenderly, ganache, foundry, hardhat, etc. for testing
const provider = ethers.getDefaultProvider("homestead");

function getPoolBundle(v2, marketKey) {
  if (v2) {
    return new LendingPoolBundle(provider, {
      LENDING_POOL: markets[marketKey].POOL,
      WETH_GATEWAY: markets[marketKey].WETH_GATEWAY,
    });
  } else {
    return new PoolBundle(provider, {
      POOL: markets[marketKey].POOL,
      WETH_GATEWAY: markets[marketKey].WETH_GATEWAY,
    });
  }
}

console.log("Available markets", markets);

// V2 + V3 Methods

async function getApprovedAmount(v2, marketKey, user, token) {
  const poolBundle = getPoolBundle(v2, marketKey);
  if (v2) {
    try {
      const approvedAmount =
        await poolBundle.depositTxBuilder.getApprovedAmount({
          user,
          token,
        });
      return approvedAmount;
    } catch (error) {
      console.error("Error fetching approved amount", error);
    }
  } else {
    try {
      const approvedAmount = await poolBundle.supplyTxBuilder.getApprovedAmount(
        {
          user,
          token,
        }
      );
      return approvedAmount;
    } catch (error) {
      console.error("Error fetching approved amount", error);
    }
  }
}

function generateApprovalTx(user, token, amount, marketKey) {
  const poolBundle = getPoolBundle(v2, marketKey);
  if (v2) {
    try {
      const approvedAmount = poolBundle.depositTxBuilder.generateApprovalTx({
        user,
        token,
        amount,
      });
      return approvedAmount;
    } catch (error) {
      console.error("Error fetching approved amount", error);
    }
  } else {
    try {
      const approvedAmount = poolBundle.supplyTxBuilder.generateApprovalTx({
        user,
        token,
        amount,
      });
      return approvedAmount;
    } catch (error) {
      console.error("Error fetching approved amount", error);
    }
  }
}

function generateSupplyTx(v2, user, token, amount, marketKey) {
  const poolBundle = getPoolBundle(v2, marketKey);
  if (v2) {
    try {
      const txData = poolBundle.depositTxBuilder.generateTxData({
        user,
        reserve: token,
        amount,
      });
      return txData;
    } catch (error) {
      console.error("Error generating supply tx data", error);
    }
  } else {
    try {
      const txData = poolBundle.supplyTxBuilder.generateTxData({
        user,
        reserve: token,
        amount,
      });
      return txData;
    } catch (error) {
      console.error("Errorgenerating deposit tx data", error);
    }
  }
}

// V3 Methods

function generateSupplyWithPermitTx(
  user,
  token,
  amount,
  signature,
  marketKey,
  deadline
) {
  const poolBundle = getPoolBundle(false, marketKey);
  try {
    const txData = poolBundle.supplyTxBuilder.generateSignedTxData({
      user,
      reserve: token,
      amount,
      signature,
      deadline,
    });
    return txData;
  } catch (error) {
    console.error("Errorgenerating deposit tx data", error);
  }
}

async function generateSupplySignatureRequest(user, token, marketKey, amount) {
  const spender = markets[marketKey].POOL;
  const tokenERC20Service = new ERC20Service(provider);
  const tokenERC2612Service = new ERC20_2612Service(provider);
  const { name } = await tokenERC20Service.getTokenData(token);
  const { chainId } = await provider.getNetwork();
  const nonce = await tokenERC2612Service.getNonce({
    token,
    owner: user,
  });
  const deadline = Math.floor(Date.now() / 1000 + 3600).toString();
  const typeData = {
    types: {
      EIP712Domain: [
        { name: "name", type: "string" },
        { name: "version", type: "string" },
        { name: "chainId", type: "uint256" },
        { name: "verifyingContract", type: "address" },
      ],
      Permit: [
        { name: "owner", type: "address" },
        { name: "spender", type: "address" },
        { name: "value", type: "uint256" },
        { name: "nonce", type: "uint256" },
        { name: "deadline", type: "uint256" },
      ],
    },
    primaryType: "Permit",
    domain: {
      name,
      version: "1",
      chainId,
      verifyingContract: token,
    },
    message: {
      owner: user,
      spender: spender,
      value: amount,
      nonce,
      deadline,
    },
  };
  return JSON.stringify(typeData);
}

Complete CLI Example

The following is a script which generates a command line interface to interact with the V2 and V3 Ethereum markets. This can be used to generate txns or used as a reference for how to integrate new transaction methods.

const ethers = require("ethers");
const markets = require("@bgd-labs/aave-address-book");
const {
  PoolBundle,
  LendingPoolBundle,
  ERC20Service,
  ERC20_2612Service,
  UiPoolDataProvider,
  ChainId,
} = require("@aave/contract-helpers");
const readline = require("readline");

// Create provider and connect wallet
// Can use a local fork network from tenderly, ganache, foundry, hardhat, etc. for testing
const provider = ethers.getDefaultProvider("homestead");

function getPoolBundle(v2, marketKey) {
  if (v2) {
    return new LendingPoolBundle(provider, {
      LENDING_POOL: markets[marketKey].POOL,
      WETH_GATEWAY: markets[marketKey].WETH_GATEWAY,
    });
  } else {
    return new PoolBundle(provider, {
      POOL: markets[marketKey].POOL,
      WETH_GATEWAY: markets[marketKey].WETH_GATEWAY,
    });
  }
}

async function getApprovedAmount(v2, marketKey, user, token) {
  const poolBundle = getPoolBundle(v2, marketKey);
  if (v2) {
    try {
      const approvedAmount =
        await poolBundle.depositTxBuilder.getApprovedAmount({
          user,
          token,
        });
      return approvedAmount;
    } catch (error) {
      console.error("Error fetching approved amount", error);
    }
  } else {
    try {
      const approvedAmount = await poolBundle.supplyTxBuilder.getApprovedAmount(
        {
          user,
          token,
        }
      );
      return approvedAmount;
    } catch (error) {
      console.error("Error fetching approved amount", error);
    }
  }
}

function isValidUint256(input) {
  try {
    const inputBN = ethers.BigNumber.from(input);
    const zero = ethers.BigNumber.from(0);
    const maxUint256 = ethers.constants.MaxUint256;

    if (inputBN.gte(zero) && inputBN.lte(maxUint256)) {
      return true;
    } else {
      return false;
    }
  } catch (error) {
    return false;
  }
}

function generateApprovalTx(user, token, amount, marketKey) {
  const poolBundle = getPoolBundle(v2, marketKey);
  if (v2) {
    try {
      const approvedAmount = poolBundle.depositTxBuilder.generateApprovalTx({
        user,
        token,
        amount,
      });
      return approvedAmount;
    } catch (error) {
      console.error("Error fetching approved amount", error);
    }
  } else {
    try {
      const approvedAmount = poolBundle.supplyTxBuilder.generateApprovalTx({
        user,
        token,
        amount,
      });
      return approvedAmount;
    } catch (error) {
      console.error("Error fetching approved amount", error);
    }
  }
}

function generateSupplyTx(v2, user, token, amount, marketKey) {
  const poolBundle = getPoolBundle(v2, marketKey);
  if (v2) {
    try {
      const txData = poolBundle.depositTxBuilder.generateTxData({
        user,
        reserve: token,
        amount,
      });
      return txData;
    } catch (error) {
      console.error("Error generating supply tx data", error);
    }
  } else {
    try {
      const txData = poolBundle.supplyTxBuilder.generateTxData({
        user,
        reserve: token,
        amount,
      });
      return txData;
    } catch (error) {
      console.error("Errorgenerating deposit tx data", error);
    }
  }
}

function generateSupplyWithPermitTx(
  user,
  token,
  amount,
  signature,
  marketKey,
  deadline
) {
  const poolBundle = getPoolBundle(false, marketKey);
  try {
    const txData = poolBundle.supplyTxBuilder.generateSignedTxData({
      user,
      reserve: token,
      amount,
      signature,
      deadline,
    });
    return txData;
  } catch (error) {
    console.error("Errorgenerating deposit tx data", error);
  }
}

async function generateSupplySignatureRequest(user, token, marketKey, amount) {
  const spender = markets[marketKey].POOL;
  const tokenERC20Service = new ERC20Service(provider);
  const tokenERC2612Service = new ERC20_2612Service(provider);
  const { name } = await tokenERC20Service.getTokenData(token);
  const { chainId } = await provider.getNetwork();
  const nonce = await tokenERC2612Service.getNonce({
    token,
    owner: user,
  });
  const deadline = Math.floor(Date.now() / 1000 + 3600).toString();
  const typeData = {
    types: {
      EIP712Domain: [
        { name: "name", type: "string" },
        { name: "version", type: "string" },
        { name: "chainId", type: "uint256" },
        { name: "verifyingContract", type: "address" },
      ],
      Permit: [
        { name: "owner", type: "address" },
        { name: "spender", type: "address" },
        { name: "value", type: "uint256" },
        { name: "nonce", type: "uint256" },
        { name: "deadline", type: "uint256" },
      ],
    },
    primaryType: "Permit",
    domain: {
      name,
      version: "1",
      chainId,
      verifyingContract: token,
    },
    message: {
      owner: user,
      spender: spender,
      value: amount,
      nonce,
      deadline,
    },
  };
  return JSON.stringify(typeData);
}

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
});

function marketContinue(marketName) {
  console.log("Press enter to continue");
  let load = true;
  rl.on("line", () => {
    if (load) {
      marketOptions(marketName);
      load = false;
    }
  });
}

async function marketOptions(marketName) {
  const v2 = marketName.includes("V2");
  console.log("\n");
  console.log("Type the number of action to perform and press Enter");
  console.log("1. Print market addresses");
  console.log("2. Print reserves info");
  console.log("3. Print user info");
  console.log("4. Check approved amount to supply");
  console.log("5. Build approval tx");
  if (v2) {
    console.log("6. Build deposit tx");
  } else {
    console.log("6. Build supply tx");
    console.log("7. Build signature request");
    console.log("8. Build supplyWithPermit tx data");
  }
  console.log(`${v2 ? "7" : "9"}. <- Back`);
  console.log("\n");

  rl.question("Your choice: ", async (answer) => {
    const choice = parseInt(answer);
    switch (choice) {
      case 1:
        const marketAddresses = markets[marketName];
        console.log(marketAddresses);
        console.log("\n");
        marketContinue(marketName);
        break;
      case 2:
        console.log("Fetching reserves...");
        try {
          // Create UiPoolDataProvider object for fetching protocol reserves data
          const uiPoolDataProvider = new UiPoolDataProvider({
            uiPoolDataProviderAddress: v2
              ? markets.AaveV2Ethereum.UI_POOL_DATA_PROVIDER
              : markets.AaveV3Ethereum.UI_POOL_DATA_PROVIDER,
            provider,
            chainId: ChainId.mainnet,
          });
          const reserves = await uiPoolDataProvider.getReservesHumanized({
            lendingPoolAddressProvider: v2
              ? markets.AaveV2Ethereum.POOL_ADDRESSES_PROVIDER
              : markets.AaveV3Ethereum.POOL_ADDRESSES_PROVIDER,
          });
          console.log(reserves);
          console.log("\n");
        } catch (error) {
          console.log("Error fetching pool reserves", error);
        } finally {
          marketContinue(marketName);
        }
        break;
      case 3:
        console.log("Enter an ethereum address");
        rl.question("Input: ", async (answer) => {
          if (!ethers.utils.isAddress(answer)) {
            console.log("Not a valid ethereum address");
            marketContinue(marketName);
          } else {
            console.log("Fetching user reserves...");
            try {
              // Create UiPoolDataProvider object for fetching protocol reserves data
              const uiPoolDataProvider = new UiPoolDataProvider({
                uiPoolDataProviderAddress: v2
                  ? markets.AaveV2Ethereum.UI_POOL_DATA_PROVIDER
                  : markets.AaveV3Ethereum.UI_POOL_DATA_PROVIDER,
                provider,
                chainId: ChainId.mainnet,
              });
              const reserves = await uiPoolDataProvider.getReservesHumanized({
                lendingPoolAddressProvider: v2
                  ? markets.AaveV2Ethereum.POOL_ADDRESSES_PROVIDER
                  : markets.AaveV3Ethereum.POOL_ADDRESSES_PROVIDER,
              });
              console.log(reserves);
              console.log("\n");
            } catch (error) {
              console.log("Error fetching pool reserves", error);
            } finally {
              marketContinue(marketName);
            }
          }
        });
        break;
      case 4:
        console.log("Enter a user address");
        rl.question("Input: ", async (user) => {
          if (!ethers.utils.isAddress(user)) {
            console.log("Not a valid ethereum address");
            marketContinue(marketName);
          } else {
            console.log("Input address of underyling token to suply");
            rl.question("Input: ", async (token) => {
              if (!ethers.utils.isAddress(token)) {
                console.log("Not a valid ethereum address");
                marketContinue(marketName);
              } else {
                const approvedAmount = await getApprovedAmount(
                  v2,
                  marketName,
                  user,
                  token
                );
                console.log(`Approved amount: ${approvedAmount}`);
                console.log("\n");
                console.log(
                  "Note: an approval amount of -1 represents a uint256.max approval or an asset that doesn't require approval (base assets)"
                );
                console.log("\n");
                marketContinue(marketName);
              }
            });
          }
        });
        break;
      case 5:
        console.log("Enter a user address");
        rl.question("Input: ", async (user) => {
          if (!ethers.utils.isAddress(user)) {
            console.log("Not a valid ethereum address");
            marketContinue(marketName);
          } else {
            console.log("Input address of underyling token to suply");
            rl.question("Input: ", async (token) => {
              if (!ethers.utils.isAddress(token)) {
                console.log("Not a valid ethereum address");
                marketContinue(marketName);
              } else {
                console.log("Input amount to supply, in native token decimals");
                rl.question("Input: ", async (amount) => {
                  if (isValidUint256(amount)) {
                    const txData = generateApprovalTx(
                      user,
                      token,
                      amount,
                      marketName
                    );
                    console.log(txData);
                    console.log("\n");
                    marketContinue(marketName);
                  } else {
                    console.log(
                      "Invalid amount input, must be number between 0 and uint256.max"
                    );
                  }
                });
              }
            });
          }
        });
        break;
      case 6:
        console.log("Enter a user address");
        rl.question("Input: ", async (user) => {
          if (!ethers.utils.isAddress(user)) {
            console.log("Not a valid ethereum address");
            marketContinue(marketName);
          } else {
            console.log("Input address of underyling token to suply");
            rl.question("Input: ", async (token) => {
              if (!ethers.utils.isAddress(token)) {
                console.log("Not a valid ethereum address");
                marketContinue(marketName);
              } else {
                console.log("Input amount to supply, in native token decimals");
                rl.question("Input: ", async (amount) => {
                  if (isValidUint256(amount)) {
                    const txData = generateSupplyTx(
                      v2,
                      user,
                      token,
                      amount,
                      marketName
                    );
                    console.log(txData);
                    console.log("\n");
                    marketContinue(marketName);
                  } else {
                    console.log(
                      "Invalid amount input, must be number between 0 and uint256.max"
                    );
                    marketContinue(marketName);
                  }
                });
              }
            });
          }
        });
        break;
      case 7:
        if (v2) {
          promptUser();
          break;
        }
        console.log("Enter a user address");
        rl.question("Input: ", async (user) => {
          if (!ethers.utils.isAddress(user)) {
            console.log("Not a valid ethereum address");
            marketContinue(marketName);
          } else {
            console.log("Input address of underyling token to suply");
            rl.question("Input: ", async (token) => {
              if (!ethers.utils.isAddress(token)) {
                console.log("Not a valid ethereum address");
                marketContinue(marketName);
              } else {
                console.log("Input amount to supply, in native token decimals");
                rl.question("Input: ", async (amount) => {
                  if (isValidUint256(amount)) {
                    const dataToSign = await generateSupplySignatureRequest(
                      user,
                      token,
                      marketName,
                      amount
                    );
                    console.log(`Data to sign: ${dataToSign}`);
                    console.log("\n");
                    marketContinue(marketName);
                  } else {
                    console.log(
                      "Invalid amount input, must be number between 0 and uint256.max"
                    );
                    marketContinue(marketName);
                  }
                });
              }
            });
          }
        });
        break;

      case 8:
        if (v2) {
          console.log("action not implemented");
        }
        console.log("Enter a user address");
        rl.question("Input: ", async (user) => {
          if (!ethers.utils.isAddress(user)) {
            console.log("Not a valid ethereum address");
            marketContinue(marketName);
          } else {
            console.log("Input address of underyling token to suply");
            rl.question("Input: ", async (token) => {
              if (!ethers.utils.isAddress(token)) {
                console.log("Not a valid ethereum address");
                marketContinue(marketName);
              } else {
                console.log("Input amount to supply, in native token decimals");
                rl.question("Input: ", async (amount) => {
                  if (isValidUint256(amount)) {
                    console.log("Input signature");
                    const deadline = Math.floor(
                      Date.now() / 1000 + 3600
                    ).toString();
                    rl.question("Input: ", async (signature) => {
                      const txData = generateSupplyWithPermitTx(
                        user,
                        token,
                        amount,
                        signature,
                        marketName,
                        deadline
                      );
                      console.log(txData);
                      console.log("\n");
                      marketContinue(marketName);
                    });
                  } else {
                    console.log(
                      "Invalid amount input, must be number between 0 and uint256.max"
                    );
                  }
                });
              }
            });
          }
        });
        break;
      case 9:
        promptUser();
        break;
      default:
        console.log("action not implemented");
        marketContinue(marketName);
        break;
    }
  });
}

function promptUser() {
  console.log("1. AaveV3Ethereum");
  console.log("2. AaveV2Ethereum");
  console.log("3. Exit");
  console.log("\n");
  console.log(
    "Type the number of the market you would like to interact with and press Enter."
  );

  rl.question("Your choice: ", async (answer) => {
    const choice = parseInt(answer);

    if (choice === 1) {
      console.log("You selected AaveV3Ethereum");
      marketOptions("AaveV3Ethereum");
    } else if (choice === 2) {
      console.log("You selected AaveV2Ethereum");
      marketOptions("AaveV2Ethereum");
    } else if (choice === 3) {
      rl.close();
    } else {
      console.log("Invalid market selection");
      promptUser();
    }
  });
}

function welcome() {
  console.log("Welcome to");
  console.log(`

     ######   ##     ##  #######   ######  ########     ######  ##       ####
    ##    ##  ##     ## ##     ## ##    ##    ##       ##    ## ##        ##
    ##        ##     ## ##     ## ##          ##       ##       ##        ##
    ##   #### ######### ##     ##  ######     ##       ##       ##        ##
    ##    ##  ##     ## ##     ##       ##    ##       ##       ##        ##
    ##    ##  ##     ## ##     ## ##    ##    ##       ##    ## ##        ##
     ######   ##     ##  #######   ######     ##        ######  ######## ####

    `);
  console.log("Press enter to begin");
  let load = true;
  rl.on("line", () => {
    if (load) {
      promptUser();
      load = false;
    }
  });
}

welcome();

Name		Name	Last commit message	Last commit date
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packages		packages
.editorconfig		.editorconfig
.eslintignore		.eslintignore
.eslintrc.json		.eslintrc.json
.gitignore		.gitignore
.markdownlint.json		.markdownlint.json
.nvmrc		.nvmrc
.prettierignore		.prettierignore
.prettierrc		.prettierrc
CONTRIBUTING.md		CONTRIBUTING.md
LICENSE		LICENSE
README.md		README.md
jest.config.js		jest.config.js
lerna.json		lerna.json
package.json		package.json
tsconfig.eslint.json		tsconfig.eslint.json
tsconfig.json		tsconfig.json
yarn.lock		yarn.lock

License

pegasys-fi/lending-utilities

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Aave Utilities

Installation

Compatibility

Features

Data Methods

Data Methods Setup

Markets Data

formatReserves

formatReservesAndIncentives

User Data

formatUserSummary

formatUserSummaryAndIncentives

Transaction Methods

Transactions Setup

Submitting Transactions

Pool V3

supplyBundle

signERC20Approval

supplyWithPermit

borrow (V3)

repay (V3)

repayWithPermit

repayWithATokens

withdraw (V3)

swapBorrowRateMode (V3)

setUsageAsCollateral (V3)

liquidationCall (V3)

swapCollateral (V3)

repayWithCollateral (V3)

setUserEMode

Lending Pool V2

depositBundle

borrow

repay

withdraw

swapBorrowRateMode

setUsageAsCollateral

liquidationCall

swapCollateral

repayWithCollateral

Governance V2

create

cancel

queue

execute

submitVote

delegate

delegateByType

Faucets

mint

Credit Delegation

approveDelegation

New Transaction Methods

Setup

Samples

About

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