ETH Price: $3,241.83 (+2.02%)
Gas: 10 Gwei

Contract

0x0439e60F02a8900a951603950d8D4527f400C3f1
 

Multichain Info

Transaction Hash
Method
Block
From
To
Value
0x1efdb0f8a83cf149cbe575c2a837bf97c9f7d2f6fbf39c1277561f389c8e9e8bBridge(pending)2024-04-24 4:01:426 mins ago1713931302IN
MetaMask: Meta Bridge
0.0031 ETH(Pending)(Pending)
0x12140714983afb1fa3d4761147b55195e852ee6a488d27573111792d7660534eBridge(pending)2024-04-24 1:22:322 hrs ago1713921752IN
MetaMask: Meta Bridge
0.0032 ETH(Pending)(Pending)
0xec7b31ea117d6b295ed26f0109ec1f55d8192eb57953489dfe355fe947d0fecaBridge(pending)2024-04-23 23:55:074 hrs ago1713916507IN
MetaMask: Meta Bridge
0.006 ETH(Pending)(Pending)
0x862a848ac4752c8ac6c6d6fc8f5fc48dfeaca8c3f5bd7563a18923e2c86b3d53Bridge(pending)2024-04-22 8:04:1844 hrs ago1713773058IN
MetaMask: Meta Bridge
0.0053276561 ETH(Pending)(Pending)
0x512a45339f276dc30f93dc127d77ba522cf06b7868d3b8fc5ae66c5472c04bc1Bridge(pending)2024-04-21 19:02:532 days ago1713726173IN
MetaMask: Meta Bridge
0.07 ETH(Pending)(Pending)
0x943196ca95977d64d14c22af3ceedafedaf6b66137c5770e92664e16e65fc925Bridge(pending)2024-04-21 14:29:562 days ago1713709796IN
MetaMask: Meta Bridge
0.0045 ETH(Pending)(Pending)
0x0733126b58a07f374fae5e2959680bd1163c826edcea489291c891df549726d8Bridge(pending)2024-04-21 8:44:142 days ago1713689054IN
MetaMask: Meta Bridge
0.006 ETH(Pending)(Pending)
0xe6cd3915fd346ef356973ef5df54f7f19de3eae3cf080c0e319203c7b9c3d51fBridge(pending)2024-04-21 3:20:413 days ago1713669641IN
MetaMask: Meta Bridge
0.0046 ETH(Pending)(Pending)
0x99045bb4f11c0ff5cf3e262353a9498ad2da4a9947d82f07bd62841f55fed83dBridge(pending)2024-04-21 3:00:153 days ago1713668415IN
MetaMask: Meta Bridge
0.005 ETH(Pending)(Pending)
0x187a71be721dc7bd746c69c01e400f7fa57927efcace80031def1714c815ccbbBridge(pending)2024-04-21 2:30:453 days ago1713666645IN
MetaMask: Meta Bridge
0.03 ETH(Pending)(Pending)
0x768379c918386182c912bd41258bb8a0f95528322188d4131536934bc22aa45dBridge(pending)2024-04-21 2:30:213 days ago1713666621IN
MetaMask: Meta Bridge
0 ETH(Pending)(Pending)
0x775345b3e1fba154328fc67efcab04a58e3ce28c0e8d1ecaeaa0f9be7c40a9bdBridge(pending)2024-04-21 2:28:103 days ago1713666490IN
MetaMask: Meta Bridge
0.0071103097 ETH(Pending)(Pending)
0x4601cd563e8ae25ddb9ac1c7c284cf4dea7b869d01922921058279de8cc3d782Bridge(pending)2024-04-21 2:22:043 days ago1713666124IN
MetaMask: Meta Bridge
0.0035 ETH(Pending)(Pending)
0x15bfe5600879b9d828ff0ecec037b999b08e101866e83ec08a8e8b78bfbd6406Bridge(pending)2024-04-21 2:16:273 days ago1713665787IN
MetaMask: Meta Bridge
0.1 ETH(Pending)(Pending)
0xcfb6d51a980ccc72a77532a18bc98885c76487e1f50048efd225a2aaa36901abBridge(pending)2024-04-20 9:40:543 days ago1713606054IN
MetaMask: Meta Bridge
0.005 ETH(Pending)(Pending)
0x5022a4a4bfa31dfbb6a6a4f5012bd2013ec8a23fd9989816576178a899a75415Bridge(pending)2024-04-20 8:49:463 days ago1713602986IN
MetaMask: Meta Bridge
0.01 ETH(Pending)(Pending)
Bridge197227522024-04-24 4:06:591 min ago1713931619IN
MetaMask: Meta Bridge
0.01 ETH0.0013823310.39688698
Bridge197227522024-04-24 4:06:591 min ago1713931619IN
MetaMask: Meta Bridge
0.0042 ETH0.0013824610.39688698
Bridge197227462024-04-24 4:05:472 mins ago1713931547IN
MetaMask: Meta Bridge
0.0035 ETH0.0014602610.98297164
Bridge197227422024-04-24 4:04:593 mins ago1713931499IN
MetaMask: Meta Bridge
0.46092224 ETH0.0042134310.10674692
Bridge197227412024-04-24 4:04:473 mins ago1713931487IN
MetaMask: Meta Bridge
0.013 ETH0.0014349510.79165863
Bridge197227412024-04-24 4:04:473 mins ago1713931487IN
MetaMask: Meta Bridge
0.03 ETH0.0014346910.79165863
Bridge197227392024-04-24 4:04:234 mins ago1713931463IN
MetaMask: Meta Bridge
0.02 ETH0.001301969.31250095
Bridge197227312024-04-24 4:02:475 mins ago1713931367IN
MetaMask: Meta Bridge
0.023 ETH0.001221799.18855209
Bridge197227272024-04-24 4:01:596 mins ago1713931319IN
MetaMask: Meta Bridge
0.17 ETH0.0013307110.00679803
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Latest 25 internal transactions (View All)

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Parent Transaction Hash Block From To Value
197227522024-04-24 4:06:591 min ago1713931619
MetaMask: Meta Bridge
0.01 ETH
197227522024-04-24 4:06:591 min ago1713931619
MetaMask: Meta Bridge
0.0042 ETH
197227462024-04-24 4:05:472 mins ago1713931547
MetaMask: Meta Bridge
0.0035 ETH
197227422024-04-24 4:04:593 mins ago1713931499
MetaMask: Meta Bridge
0.46092224 ETH
197227412024-04-24 4:04:473 mins ago1713931487
MetaMask: Meta Bridge
0.013 ETH
197227412024-04-24 4:04:473 mins ago1713931487
MetaMask: Meta Bridge
0.03 ETH
197227392024-04-24 4:04:234 mins ago1713931463
MetaMask: Meta Bridge
0.02 ETH
197227312024-04-24 4:02:475 mins ago1713931367
MetaMask: Meta Bridge
0.023 ETH
197227272024-04-24 4:01:596 mins ago1713931319
MetaMask: Meta Bridge
0.17 ETH
197227112024-04-24 3:58:479 mins ago1713931127
MetaMask: Meta Bridge
0.0175 ETH
197227052024-04-24 3:57:3511 mins ago1713931055
MetaMask: Meta Bridge
0.003085 ETH
197227042024-04-24 3:57:2311 mins ago1713931043
MetaMask: Meta Bridge
0.00560188 ETH
197226942024-04-24 3:55:2313 mins ago1713930923
MetaMask: Meta Bridge
0.00007515 ETH
197226862024-04-24 3:53:4714 mins ago1713930827
MetaMask: Meta Bridge
0.007 ETH
197226752024-04-24 3:51:3517 mins ago1713930695
MetaMask: Meta Bridge
0.01469861 ETH
197226722024-04-24 3:50:5917 mins ago1713930659
MetaMask: Meta Bridge
0.00013981 ETH
197226702024-04-24 3:50:3518 mins ago1713930635
MetaMask: Meta Bridge
0.02 ETH
197226632024-04-24 3:49:1119 mins ago1713930551
MetaMask: Meta Bridge
0.64 ETH
197226602024-04-24 3:48:3520 mins ago1713930515
MetaMask: Meta Bridge
0.1 ETH
197226582024-04-24 3:48:1120 mins ago1713930491
MetaMask: Meta Bridge
0.004 ETH
197226582024-04-24 3:48:1120 mins ago1713930491
MetaMask: Meta Bridge
0.004 ETH
197226572024-04-24 3:47:5920 mins ago1713930479
MetaMask: Meta Bridge
0.05 ETH
197226572024-04-24 3:47:5920 mins ago1713930479
MetaMask: Meta Bridge
0.03 ETH
197226522024-04-24 3:46:5921 mins ago1713930419
MetaMask: Meta Bridge
0.01 ETH
197226442024-04-24 3:45:2323 mins ago1713930323
MetaMask: Meta Bridge
0.3 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
MetaBridge

Compiler Version
v0.8.1+commit.df193b15

Optimization Enabled:
Yes with 999999 runs

Other Settings:
default evmVersion
File 1 of 16 : MetaBridge.sol
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {IAdapter, IBridge, ISpender} from "contracts/interfaces/Exports.sol";
import {Constants} from "contracts/utils/Exports.sol";
import "./Spender.sol";

contract MetaBridge is IBridge, Ownable, Pausable, ReentrancyGuard {
    using SafeERC20 for IERC20;
    using Address for address;

    ISpender public immutable spender;

    // Mapping of adapterId to adapter
    mapping(string => address) public adapters;
    mapping(string => bool) public adapterRemoved;

    /**
     * @notice Constructor to create the MetaBridge
     * @param _owner The Owner of the MetaBridge set on deployment
     * @dev Deploys the Spender. Once the Spender is deployed it cannot be changed
     */
    constructor(address _owner) {
        spender = new Spender();
        _transferOwnership(_owner);
    }

    /**
     * @notice Sets the adapter for an aggregator. It can't be changed later.
     * @param adapterId Aggregator's identifier
     * @param adapterAddress Address of the contract that contains the logic for this aggregator
     */
    function setAdapter(
        string calldata adapterId,
        address adapterAddress
    ) external override onlyOwner {
        require(adapterAddress.isContract(), "ADAPTER_IS_NOT_A_CONTRACT");
        require(!adapterRemoved[adapterId], "ADAPTER_REMOVED");
        require(adapters[adapterId] == address(0), "ADAPTER_EXISTS");
        require(bytes(adapterId).length > 0, "INVALID_ADAPTED_ID");

        adapters[adapterId] = adapterAddress;
        emit AdapterSet(adapterId, adapterAddress);
    }

    /**
     * @notice Removes the adapter for an existing aggregator. This can't be undone.
     * @param adapterId Adapter's identifier
     */
    function removeAdapter(
        string calldata adapterId
    ) external override onlyOwner {
        require(adapters[adapterId] != address(0), "ADAPTER_DOES_NOT_EXIST");
        delete adapters[adapterId];
        adapterRemoved[adapterId] = true;
        emit AdapterRemoved(adapterId);
    }

    /**
     * @notice Performs a bridge
     * @param adapterId Identifier of the aggregator to be used for the bridge
     * @param srcToken Identifier of the source chain
     * @param amount Amount of tokens to be transferred from the destination chain
     * @param data Dynamic data which is passed in to the delegatecall made to the adapter
     * @dev pausable and nonreentrant
     */
    function bridge(
        string calldata adapterId,
        address srcToken,
        uint256 amount,
        bytes calldata data
    ) external payable override whenNotPaused nonReentrant {
        address adapter = adapters[adapterId];
        require(adapter != address(0), "ADAPTER_NOT_FOUND");

        // Move ERC20 funds to the spender
        if (srcToken != Constants.NATIVE_TOKEN) {
            IERC20(srcToken).safeTransferFrom(
                msg.sender,
                address(spender),
                amount
            );
        } else {
            require(msg.value == amount, "MSGVALUE_AMOUNT_MISMATCH");
        }

        spender.bridge{value: msg.value}(
            adapter,
            abi.encodePacked(
                // bridge signature
                IAdapter.bridge.selector,
                abi.encode(msg.sender),
                data
            )
        );
    }

    /**
     * @notice Prevents the bridge function from being executed until the contract is unpaused.
     */
    function pauseBridge() external onlyOwner {
        _pause();
    }

    /**
     * @notice Unpauses the contract to make the bridge function callable.
     */
    function unpauseBridge() external onlyOwner {
        _unpause();
    }
}

File 2 of 16 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

File 3 of 16 : Pausable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

File 4 of 16 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

File 5 of 16 : IERC20Permit.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @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:
     *
     * - `spender` cannot be the zero address.
     * - `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 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}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

File 6 of 16 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

    /**
     * @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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool);
}

File 7 of 16 : SafeERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

File 8 of 16 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

File 9 of 16 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

File 10 of 16 : Exports.sol
pragma solidity ^0.8.0;

import {IAdapter} from "./IAdapter.sol";
import {IBridge} from "./IBridge.sol";
import {ISpender} from "./ISpender.sol";

File 11 of 16 : IAdapter.sol
pragma solidity ^0.8.0;

interface IAdapter {
    event Bridge(
        address recipient,
        address aggregator,
        uint256 destChain,
        address srcToken,
        address destToken,
        uint256 srcAmount
    );

    event Fee(address srcToken, address feeWallet, uint256 fee);

    function bridge(
        address recipient,
        address aggregator,
        address spender,
        uint256 destChain,
        address srcToken,
        address destToken,
        uint256 srcAmount,
        bytes calldata data,
        uint256 fee,
        address payable feeWallet
    ) external payable;
}

File 12 of 16 : IBridge.sol
pragma solidity ^0.8.0;

interface IBridge {
    event AdapterSet(string adapterId, address addr);

    event AdapterRemoved(string adapterId);

    function setAdapter(
        string calldata adapterId,
        address adapterAddress
    ) external;

    function removeAdapter(string calldata adapterId) external;

    function bridge(
        string calldata adapterId,
        address tokenFrom,
        uint256 amount,
        bytes calldata data
    ) external payable;
}

File 13 of 16 : ISpender.sol
pragma solidity ^0.8.0;

interface ISpender {
    function bridge(
        address adapterAddress,
        bytes calldata data
    ) external payable;
}

File 15 of 16 : Spender.sol
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/utils/Address.sol";
import {IBridge, ISpender} from "contracts/interfaces/Exports.sol";

contract Spender is ISpender {
    using Address for address;

    IBridge public immutable metabridge;

    /**
     * @dev MetaBridge creates the Spender. Not intended to be called directly.
     */
    constructor() public {
        metabridge = IBridge(msg.sender);
    }

    /**
     * @notice Performs a bridge
     * @param adapter Address of the adapter to be used for the bridge
     * @param data Dynamic data which is passed in to the delegatecall made to the adapter
     */
    function bridge(
        address adapter,
        bytes calldata data
    ) external payable override {
        require(msg.sender == address(metabridge), "FORBIDDEN");
        adapter.functionDelegateCall(data, "ADAPTER_DELEGATECALL_FAILED");
    }
}

File 16 of 16 : Constants.sol
pragma solidity ^0.8.0;

library Constants {
    address internal constant NATIVE_TOKEN =
        0x0000000000000000000000000000000000000000;
}

File 17 of 16 : Exports.sol
pragma solidity ^0.8.0;

import {Constants} from "./Constants.sol";

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"_owner","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"string","name":"adapterId","type":"string"}],"name":"AdapterRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"string","name":"adapterId","type":"string"},{"indexed":false,"internalType":"address","name":"addr","type":"address"}],"name":"AdapterSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"inputs":[{"internalType":"string","name":"","type":"string"}],"name":"adapterRemoved","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"","type":"string"}],"name":"adapters","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"adapterId","type":"string"},{"internalType":"address","name":"srcToken","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"bridge","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pauseBridge","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"adapterId","type":"string"}],"name":"removeAdapter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"adapterId","type":"string"},{"internalType":"address","name":"adapterAddress","type":"address"}],"name":"setAdapter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"spender","outputs":[{"internalType":"contract ISpender","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpauseBridge","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Deployed Bytecode

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

00000000000000000000000032ed10824819fdaa52e7ff9c50cda6a5cf7a1b35

-----Decoded View---------------
Arg [0] : _owner (address): 0x32ed10824819fDaa52E7fF9c50CdA6A5cf7a1B35

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000032ed10824819fdaa52e7ff9c50cda6a5cf7a1b35


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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.