Transaction Hash:
Block:
11955004 at Mar-01-2021 10:18:36 PM +UTC
Transaction Fee:
0.002088612 ETH
$6.33
Gas Used:
25,164 Gas / 83 Gwei
Emitted Events:
188 |
WETH10.Transfer( from=0x0000000000000000000000000000000000000000, to=0xf1DF5c99E42a368229968f5AaDFCa0faB3aABF35, value=0 )
|
Account State Difference:
Address | Before | After | State Difference | ||
---|---|---|---|---|---|
0x1C0Aa8cC...e6f855A20 |
0.924360065143094671 Eth
Nonce: 4756
|
0.922271453143094671 Eth
Nonce: 4757
| 0.002088612 | ||
0x829BD824...93333A830
Miner
| (F2Pool Old) | 4,014.930962996452676368 Eth | 4,014.933051608452676368 Eth | 0.002088612 |
Execution Trace
WETH10.depositTo( to=0xf1DF5c99E42a368229968f5AaDFCa0faB3aABF35 )
depositTo[WETH10 (ln:79)]
Transfer[WETH10 (ln:82)]
// SPDX-License-Identifier: GPL-3.0-or-later // Copyright (C) 2015, 2016, 2017 Dapphub // Adapted by Ethereum Community 2021 pragma solidity 0.7.6; import "./interfaces/IWETH10.sol"; import "erc3156/contracts/interfaces/IERC3156FlashBorrower.sol"; interface ITransferReceiver { function onTokenTransfer(address, uint, bytes calldata) external returns (bool); } interface IApprovalReceiver { function onTokenApproval(address, uint, bytes calldata) external returns (bool); } /// @dev Wrapped Ether v10 (WETH10) is an Ether (ETH) ERC-20 wrapper. You can `deposit` ETH and obtain a WETH10 balance which can then be operated as an ERC-20 token. You can /// `withdraw` ETH from WETH10, which will then burn WETH10 token in your wallet. The amount of WETH10 token in any wallet is always identical to the /// balance of ETH deposited minus the ETH withdrawn with that specific wallet. contract WETH10 is IWETH10 { string public constant name = "Wrapped Ether v10"; string public constant symbol = "WETH10"; uint8 public constant decimals = 18; bytes32 public immutable CALLBACK_SUCCESS = keccak256("ERC3156FlashBorrower.onFlashLoan"); bytes32 public immutable PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"); uint256 public immutable deploymentChainId; bytes32 private immutable _DOMAIN_SEPARATOR; /// @dev Records amount of WETH10 token owned by account. mapping (address => uint256) public override balanceOf; /// @dev Records current ERC2612 nonce for account. This value must be included whenever signature is generated for {permit}. /// Every successful call to {permit} increases account's nonce by one. This prevents signature from being used multiple times. mapping (address => uint256) public override nonces; /// @dev Records number of WETH10 token that account (second) will be allowed to spend on behalf of another account (first) through {transferFrom}. mapping (address => mapping (address => uint256)) public override allowance; /// @dev Current amount of flash-minted WETH10 token. uint256 public override flashMinted; constructor() { uint256 chainId; assembly {chainId := chainid()} deploymentChainId = chainId; _DOMAIN_SEPARATOR = _calculateDomainSeparator(chainId); } /// @dev Calculate the DOMAIN_SEPARATOR function _calculateDomainSeparator(uint256 chainId) private view returns (bytes32) { return keccak256( abi.encode( keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"), keccak256(bytes(name)), keccak256(bytes("1")), chainId, address(this) ) ); } /// @dev Return the DOMAIN_SEPARATOR function DOMAIN_SEPARATOR() external view override returns (bytes32) { uint256 chainId; assembly {chainId := chainid()} return chainId == deploymentChainId ? _DOMAIN_SEPARATOR : _calculateDomainSeparator(chainId); } /// @dev Returns the total supply of WETH10 token as the ETH held in this contract. function totalSupply() external view override returns (uint256) { return address(this).balance + flashMinted; } /// @dev Fallback, `msg.value` of ETH sent to this contract grants caller account a matching increase in WETH10 token balance. /// Emits {Transfer} event to reflect WETH10 token mint of `msg.value` from `address(0)` to caller account. receive() external payable { // _mintTo(msg.sender, msg.value); balanceOf[msg.sender] += msg.value; emit Transfer(address(0), msg.sender, msg.value); } /// @dev `msg.value` of ETH sent to this contract grants caller account a matching increase in WETH10 token balance. /// Emits {Transfer} event to reflect WETH10 token mint of `msg.value` from `address(0)` to caller account. function deposit() external override payable { // _mintTo(msg.sender, msg.value); balanceOf[msg.sender] += msg.value; emit Transfer(address(0), msg.sender, msg.value); } /// @dev `msg.value` of ETH sent to this contract grants `to` account a matching increase in WETH10 token balance. /// Emits {Transfer} event to reflect WETH10 token mint of `msg.value` from `address(0)` to `to` account. function depositTo(address to) external override payable { // _mintTo(to, msg.value); balanceOf[to] += msg.value; emit Transfer(address(0), to, msg.value); } /// @dev `msg.value` of ETH sent to this contract grants `to` account a matching increase in WETH10 token balance, /// after which a call is executed to an ERC677-compliant contract with the `data` parameter. /// Emits {Transfer} event. /// Returns boolean value indicating whether operation succeeded. /// For more information on {transferAndCall} format, see https://github.com/ethereum/EIPs/issues/677. function depositToAndCall(address to, bytes calldata data) external override payable returns (bool success) { // _mintTo(to, msg.value); balanceOf[to] += msg.value; emit Transfer(address(0), to, msg.value); return ITransferReceiver(to).onTokenTransfer(msg.sender, msg.value, data); } /// @dev Return the amount of WETH10 token that can be flash-lent. function maxFlashLoan(address token) external view override returns (uint256) { return token == address(this) ? type(uint112).max - flashMinted : 0; // Can't underflow } /// @dev Return the fee (zero) for flash lending an amount of WETH10 token. function flashFee(address token, uint256) external view override returns (uint256) { require(token == address(this), "WETH: flash mint only WETH10"); return 0; } /// @dev Flash lends `value` WETH10 token to the receiver address. /// By the end of the transaction, `value` WETH10 token will be burned from the receiver. /// The flash-minted WETH10 token is not backed by real ETH, but can be withdrawn as such up to the ETH balance of this contract. /// Arbitrary data can be passed as a bytes calldata parameter. /// Emits {Approval} event to reflect reduced allowance `value` for this contract to spend from receiver account (`receiver`), /// unless allowance is set to `type(uint256).max` /// Emits two {Transfer} events for minting and burning of the flash-minted amount. /// Returns boolean value indicating whether operation succeeded. /// Requirements: /// - `value` must be less or equal to type(uint112).max. /// - The total of all flash loans in a tx must be less or equal to type(uint112).max. function flashLoan(IERC3156FlashBorrower receiver, address token, uint256 value, bytes calldata data) external override returns (bool) { require(token == address(this), "WETH: flash mint only WETH10"); require(value <= type(uint112).max, "WETH: individual loan limit exceeded"); flashMinted = flashMinted + value; require(flashMinted <= type(uint112).max, "WETH: total loan limit exceeded"); // _mintTo(address(receiver), value); balanceOf[address(receiver)] += value; emit Transfer(address(0), address(receiver), value); require( receiver.onFlashLoan(msg.sender, address(this), value, 0, data) == CALLBACK_SUCCESS, "WETH: flash loan failed" ); // _decreaseAllowance(address(receiver), address(this), value); uint256 allowed = allowance[address(receiver)][address(this)]; if (allowed != type(uint256).max) { require(allowed >= value, "WETH: request exceeds allowance"); uint256 reduced = allowed - value; allowance[address(receiver)][address(this)] = reduced; emit Approval(address(receiver), address(this), reduced); } // _burnFrom(address(receiver), value); uint256 balance = balanceOf[address(receiver)]; require(balance >= value, "WETH: burn amount exceeds balance"); balanceOf[address(receiver)] = balance - value; emit Transfer(address(receiver), address(0), value); flashMinted = flashMinted - value; return true; } /// @dev Burn `value` WETH10 token from caller account and withdraw matching ETH to the same. /// Emits {Transfer} event to reflect WETH10 token burn of `value` to `address(0)` from caller account. /// Requirements: /// - caller account must have at least `value` balance of WETH10 token. function withdraw(uint256 value) external override { // _burnFrom(msg.sender, value); uint256 balance = balanceOf[msg.sender]; require(balance >= value, "WETH: burn amount exceeds balance"); balanceOf[msg.sender] = balance - value; emit Transfer(msg.sender, address(0), value); // _transferEther(msg.sender, value); (bool success, ) = msg.sender.call{value: value}(""); require(success, "WETH: ETH transfer failed"); } /// @dev Burn `value` WETH10 token from caller account and withdraw matching ETH to account (`to`). /// Emits {Transfer} event to reflect WETH10 token burn of `value` to `address(0)` from caller account. /// Requirements: /// - caller account must have at least `value` balance of WETH10 token. function withdrawTo(address payable to, uint256 value) external override { // _burnFrom(msg.sender, value); uint256 balance = balanceOf[msg.sender]; require(balance >= value, "WETH: burn amount exceeds balance"); balanceOf[msg.sender] = balance - value; emit Transfer(msg.sender, address(0), value); // _transferEther(to, value); (bool success, ) = to.call{value: value}(""); require(success, "WETH: ETH transfer failed"); } /// @dev Burn `value` WETH10 token from account (`from`) and withdraw matching ETH to account (`to`). /// Emits {Approval} event to reflect reduced allowance `value` for caller account to spend from account (`from`), /// unless allowance is set to `type(uint256).max` /// Emits {Transfer} event to reflect WETH10 token burn of `value` to `address(0)` from account (`from`). /// Requirements: /// - `from` account must have at least `value` balance of WETH10 token. /// - `from` account must have approved caller to spend at least `value` of WETH10 token, unless `from` and caller are the same account. function withdrawFrom(address from, address payable to, uint256 value) external override { if (from != msg.sender) { // _decreaseAllowance(from, msg.sender, value); uint256 allowed = allowance[from][msg.sender]; if (allowed != type(uint256).max) { require(allowed >= value, "WETH: request exceeds allowance"); uint256 reduced = allowed - value; allowance[from][msg.sender] = reduced; emit Approval(from, msg.sender, reduced); } } // _burnFrom(from, value); uint256 balance = balanceOf[from]; require(balance >= value, "WETH: burn amount exceeds balance"); balanceOf[from] = balance - value; emit Transfer(from, address(0), value); // _transferEther(to, value); (bool success, ) = to.call{value: value}(""); require(success, "WETH: Ether transfer failed"); } /// @dev Sets `value` as allowance of `spender` account over caller account's WETH10 token. /// Emits {Approval} event. /// Returns boolean value indicating whether operation succeeded. function approve(address spender, uint256 value) external override returns (bool) { // _approve(msg.sender, spender, value); allowance[msg.sender][spender] = value; emit Approval(msg.sender, spender, value); return true; } /// @dev Sets `value` as allowance of `spender` account over caller account's WETH10 token, /// after which a call is executed to an ERC677-compliant contract with the `data` parameter. /// Emits {Approval} event. /// Returns boolean value indicating whether operation succeeded. /// For more information on {approveAndCall} format, see https://github.com/ethereum/EIPs/issues/677. function approveAndCall(address spender, uint256 value, bytes calldata data) external override returns (bool) { // _approve(msg.sender, spender, value); allowance[msg.sender][spender] = value; emit Approval(msg.sender, spender, value); return IApprovalReceiver(spender).onTokenApproval(msg.sender, value, data); } /// @dev Sets `value` as allowance of `spender` account over `owner` account's WETH10 token, given `owner` account's signed approval. /// Emits {Approval} event. /// Requirements: /// - `deadline` must be timestamp in future. /// - `v`, `r` and `s` must be valid `secp256k1` signature from `owner` account over EIP712-formatted function arguments. /// - the signature must use `owner` account's current nonce (see {nonces}). /// - the signer cannot be `address(0)` and must be `owner` account. /// For more information on signature format, see https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP section]. /// WETH10 token implementation adapted from https://github.com/albertocuestacanada/ERC20Permit/blob/master/contracts/ERC20Permit.sol. function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external override { require(block.timestamp <= deadline, "WETH: Expired permit"); uint256 chainId; assembly {chainId := chainid()} bytes32 hashStruct = keccak256( abi.encode( PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline)); bytes32 hash = keccak256( abi.encodePacked( "\\x19\\x01", chainId == deploymentChainId ? _DOMAIN_SEPARATOR : _calculateDomainSeparator(chainId), hashStruct)); address signer = ecrecover(hash, v, r, s); require(signer != address(0) && signer == owner, "WETH: invalid permit"); // _approve(owner, spender, value); allowance[owner][spender] = value; emit Approval(owner, spender, value); } /// @dev Moves `value` WETH10 token from caller's account to account (`to`). /// A transfer to `address(0)` triggers an ETH withdraw matching the sent WETH10 token in favor of caller. /// Emits {Transfer} event. /// Returns boolean value indicating whether operation succeeded. /// Requirements: /// - caller account must have at least `value` WETH10 token. function transfer(address to, uint256 value) external override returns (bool) { // _transferFrom(msg.sender, to, value); if (to != address(0)) { // Transfer uint256 balance = balanceOf[msg.sender]; require(balance >= value, "WETH: transfer amount exceeds balance"); balanceOf[msg.sender] = balance - value; balanceOf[to] += value; emit Transfer(msg.sender, to, value); } else { // Withdraw uint256 balance = balanceOf[msg.sender]; require(balance >= value, "WETH: burn amount exceeds balance"); balanceOf[msg.sender] = balance - value; emit Transfer(msg.sender, address(0), value); (bool success, ) = msg.sender.call{value: value}(""); require(success, "WETH: ETH transfer failed"); } return true; } /// @dev Moves `value` WETH10 token from account (`from`) to account (`to`) using allowance mechanism. /// `value` is then deducted from caller account's allowance, unless set to `type(uint256).max`. /// A transfer to `address(0)` triggers an ETH withdraw matching the sent WETH10 token in favor of caller. /// Emits {Approval} event to reflect reduced allowance `value` for caller account to spend from account (`from`), /// unless allowance is set to `type(uint256).max` /// Emits {Transfer} event. /// Returns boolean value indicating whether operation succeeded. /// Requirements: /// - `from` account must have at least `value` balance of WETH10 token. /// - `from` account must have approved caller to spend at least `value` of WETH10 token, unless `from` and caller are the same account. function transferFrom(address from, address to, uint256 value) external override returns (bool) { if (from != msg.sender) { // _decreaseAllowance(from, msg.sender, value); uint256 allowed = allowance[from][msg.sender]; if (allowed != type(uint256).max) { require(allowed >= value, "WETH: request exceeds allowance"); uint256 reduced = allowed - value; allowance[from][msg.sender] = reduced; emit Approval(from, msg.sender, reduced); } } // _transferFrom(from, to, value); if (to != address(0)) { // Transfer uint256 balance = balanceOf[from]; require(balance >= value, "WETH: transfer amount exceeds balance"); balanceOf[from] = balance - value; balanceOf[to] += value; emit Transfer(from, to, value); } else { // Withdraw uint256 balance = balanceOf[from]; require(balance >= value, "WETH: burn amount exceeds balance"); balanceOf[from] = balance - value; emit Transfer(from, address(0), value); (bool success, ) = msg.sender.call{value: value}(""); require(success, "WETH: ETH transfer failed"); } return true; } /// @dev Moves `value` WETH10 token from caller's account to account (`to`), /// after which a call is executed to an ERC677-compliant contract with the `data` parameter. /// A transfer to `address(0)` triggers an ETH withdraw matching the sent WETH10 token in favor of caller. /// Emits {Transfer} event. /// Returns boolean value indicating whether operation succeeded. /// Requirements: /// - caller account must have at least `value` WETH10 token. /// For more information on {transferAndCall} format, see https://github.com/ethereum/EIPs/issues/677. function transferAndCall(address to, uint value, bytes calldata data) external override returns (bool) { // _transferFrom(msg.sender, to, value); if (to != address(0)) { // Transfer uint256 balance = balanceOf[msg.sender]; require(balance >= value, "WETH: transfer amount exceeds balance"); balanceOf[msg.sender] = balance - value; balanceOf[to] += value; emit Transfer(msg.sender, to, value); } else { // Withdraw uint256 balance = balanceOf[msg.sender]; require(balance >= value, "WETH: burn amount exceeds balance"); balanceOf[msg.sender] = balance - value; emit Transfer(msg.sender, address(0), value); (bool success, ) = msg.sender.call{value: value}(""); require(success, "WETH: ETH transfer failed"); } return ITransferReceiver(to).onTokenTransfer(msg.sender, value, data); } } // SPDX-License-Identifier: GPL-3.0-or-later // Copyright (C) 2015, 2016, 2017 Dapphub // Adapted by Ethereum Community 2021 pragma solidity 0.7.6; import "./IERC20.sol"; import "./IERC2612.sol"; import "erc3156/contracts/interfaces/IERC3156FlashLender.sol"; /// @dev Wrapped Ether v10 (WETH10) is an Ether (ETH) ERC-20 wrapper. You can `deposit` ETH and obtain a WETH10 balance which can then be operated as an ERC-20 token. You can /// `withdraw` ETH from WETH10, which will then burn WETH10 token in your wallet. The amount of WETH10 token in any wallet is always identical to the /// balance of ETH deposited minus the ETH withdrawn with that specific wallet. interface IWETH10 is IERC20, IERC2612, IERC3156FlashLender { /// @dev Returns current amount of flash-minted WETH10 token. function flashMinted() external view returns(uint256); /// @dev `msg.value` of ETH sent to this contract grants caller account a matching increase in WETH10 token balance. /// Emits {Transfer} event to reflect WETH10 token mint of `msg.value` from `address(0)` to caller account. function deposit() external payable; /// @dev `msg.value` of ETH sent to this contract grants `to` account a matching increase in WETH10 token balance. /// Emits {Transfer} event to reflect WETH10 token mint of `msg.value` from `address(0)` to `to` account. function depositTo(address to) external payable; /// @dev Burn `value` WETH10 token from caller account and withdraw matching ETH to the same. /// Emits {Transfer} event to reflect WETH10 token burn of `value` to `address(0)` from caller account. /// Requirements: /// - caller account must have at least `value` balance of WETH10 token. function withdraw(uint256 value) external; /// @dev Burn `value` WETH10 token from caller account and withdraw matching ETH to account (`to`). /// Emits {Transfer} event to reflect WETH10 token burn of `value` to `address(0)` from caller account. /// Requirements: /// - caller account must have at least `value` balance of WETH10 token. function withdrawTo(address payable to, uint256 value) external; /// @dev Burn `value` WETH10 token from account (`from`) and withdraw matching ETH to account (`to`). /// Emits {Approval} event to reflect reduced allowance `value` for caller account to spend from account (`from`), /// unless allowance is set to `type(uint256).max` /// Emits {Transfer} event to reflect WETH10 token burn of `value` to `address(0)` from account (`from`). /// Requirements: /// - `from` account must have at least `value` balance of WETH10 token. /// - `from` account must have approved caller to spend at least `value` of WETH10 token, unless `from` and caller are the same account. function withdrawFrom(address from, address payable to, uint256 value) external; /// @dev `msg.value` of ETH sent to this contract grants `to` account a matching increase in WETH10 token balance, /// after which a call is executed to an ERC677-compliant contract with the `data` parameter. /// Emits {Transfer} event. /// Returns boolean value indicating whether operation succeeded. /// For more information on {transferAndCall} format, see https://github.com/ethereum/EIPs/issues/677. function depositToAndCall(address to, bytes calldata data) external payable returns (bool); /// @dev Sets `value` as allowance of `spender` account over caller account's WETH10 token, /// after which a call is executed to an ERC677-compliant contract with the `data` parameter. /// Emits {Approval} event. /// Returns boolean value indicating whether operation succeeded. /// For more information on {approveAndCall} format, see https://github.com/ethereum/EIPs/issues/677. function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool); /// @dev Moves `value` WETH10 token from caller's account to account (`to`), /// after which a call is executed to an ERC677-compliant contract with the `data` parameter. /// A transfer to `address(0)` triggers an ETH withdraw matching the sent WETH10 token in favor of caller. /// Emits {Transfer} event. /// Returns boolean value indicating whether operation succeeded. /// Requirements: /// - caller account must have at least `value` WETH10 token. /// For more information on {transferAndCall} format, see https://github.com/ethereum/EIPs/issues/677. function transferAndCall(address to, uint value, bytes calldata data) external returns (bool); } // SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <=0.8.0; interface IERC3156FlashBorrower { /** * @dev Receive a flash loan. * @param initiator The initiator of the loan. * @param token The loan currency. * @param amount The amount of tokens lent. * @param fee The additional amount of tokens to repay. * @param data Arbitrary data structure, intended to contain user-defined parameters. * @return The keccak256 hash of "ERC3156FlashBorrower.onFlashLoan" */ function onFlashLoan( address initiator, address token, uint256 amount, uint256 fee, bytes calldata data ) external returns (bytes32); } // SPDX-License-Identifier: MIT pragma solidity ^0.7.6; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); } // SPDX-License-Identifier: GPL-3.0-or-later // Code adapted from https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2237/ pragma solidity ^0.7.6; /** * @dev Interface of the ERC2612 standard as defined in the EIP. * * Adds the {permit} method, which can be used to change one's * {IERC20-allowance} without having to send a transaction, by signing a * message. This allows users to spend tokens without having to hold Ether. * * See https://eips.ethereum.org/EIPS/eip-2612. */ interface IERC2612 { /** * @dev Sets `value` as the allowance of `spender` over `owner`'s tokens, * given `owner`'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be `address(0)`. * - `spender` cannot be `address(0)`. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use `owner`'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. */ function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external; /** * @dev Returns the current ERC2612 nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases `owner`'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by EIP712. */ function DOMAIN_SEPARATOR() external view returns (bytes32); } // SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <=0.8.0; import "./IERC3156FlashBorrower.sol"; interface IERC3156FlashLender { /** * @dev The amount of currency available to be lended. * @param token The loan currency. * @return The amount of `token` that can be borrowed. */ function maxFlashLoan( address token ) external view returns (uint256); /** * @dev The fee to be charged for a given loan. * @param token The loan currency. * @param amount The amount of tokens lent. * @return The amount of `token` to be charged for the loan, on top of the returned principal. */ function flashFee( address token, uint256 amount ) external view returns (uint256); /** * @dev Initiate a flash loan. * @param receiver The receiver of the tokens in the loan, and the receiver of the callback. * @param token The loan currency. * @param amount The amount of tokens lent. * @param data Arbitrary data structure, intended to contain user-defined parameters. */ function flashLoan( IERC3156FlashBorrower receiver, address token, uint256 amount, bytes calldata data ) external returns (bool); }