AAVE Token

The AAVE token is an ERC-20 compatible token with the addition of a snapshot feature (used in governance balance tracking) and integrates EIP 2612 permit function, allowing gas-less transactions and one transaction approval/transfer.

This section will cover the technical aspects of the token.

For governance, security, and incentive details, see the Aavenomics documentation.

For LEND to AAVE migration, see the v1 migration docs.

The source code for the AAVE token can be found on Github here.

Deployed Contracts

Mainnet

Proxy Contracts	Address and ABIs
AAVE token	0x7Fc66500c84A76Ad7e9c93437bFc5Ac33E2DDaE9

Audits

Auditor	Audit Type
Consensys Diligence (AAVE token)	Smart Contract
Certik (AAVE token)	Smart Contract
Certora (AAVE token)	Properties Verification

Methods

Besides the standard ERC20 token features (transfer(), balanceOf(), allowance(), etc), the following features are also available.

permit()

function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external

Allows a user to permit another account (or contract) to use their funds using a signed message. This enables gas-less transactions and single approval/transfer transactions.

Parameter	Type	Description
owner	address	The owner of the funds
spender	address	The spender for the funds
value	uint256	The amount the spender is permitted to use
deadline	uint256	The deadline timestamp that the permit is valid. Use type(uint).max for no deadline.
v	uint8	Signature parameter
r	bytes32	Signature parameter
s	bytes32	Signature parameter

Web3.js

import { signTypedData_v4 } from 'eth-sig-util'
import { fromRpcSig } from 'ethereumjs-util'

// ... other imports

import AaveTokenAbi from "./AaveTokenAbi.json"

// ... setup your web3 provider

const aaveTokenAddress = "AAVE_TOKEN_ADDRESS"
const aaveTokenContract = new web3.eth.Contract(AaveTokenAbi, aaveTokenAddress)

const privateKey = "YOUR_PRIVATE_KEY_WITHOUT_0x"
const chainId = 1
const owner = "OWNER_ADDRESS"
const spender = "SPENDER_ADDRESS"
const value = 100 // Amount the spender is permitted
const nonce = 1 // The next valid nonce, use `_nonces()`
const deadline = 1600093162

const permitParams = {
  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: "Aave Token",
    version: "1",
    chainId: chainId,
    verifyingContract: aaveTokenAddress,
  },
  message: {
    owner,
    spender,
    value,
    nonce,
    deadline,
  },
}

const signature = signTypedData_v4(
  Buffer.from(privateKey, "hex"),
  { data: permitParams }
)

const { v, r, s } = fromRpcSig(signature)

await aaveTokenContract.methods
    .permit({
      owner,
      spender,
      value,
      deadline,
      v,
      r,
      s
    })
    .send()
    .catch((e) => {
        throw Error(`Error permitting: ${e.message}`)
    })

_nonces()

function _nonces(address owner) public

Returns the next valid nonce to submit when calling permit()

event SnapshotDone

event SnapshotDone(address owner, uint128 oldValue, uint128 newValue)

An event emitted on every transfer, mint (with a valid to address), and burn (with a valid from address).

The snapshots are used for governance balance tracking.

Parameter	Type	Description
owner	address	The owner of the AAVE tokens
oldValue	uint128	The value before the operation was executed
newValue	uint128	The value after the operation was executed.