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Outline

• interface IERC20Token
•    - function name()
•    - function symbol()
•    - function decimals()
•    - function totalSupply()
•    - function balanceOf(address _owner)
•    - function allowance(address _owner, ad ...
•    - function transfer(address _to, uint25 ...
•    - function transferFrom(address _from, ...
•    - function approve(address _spender, ui ...
•  contract TokenHandler
•    - function safeApprove(IERC20Token _tok ...
•    - function safeTransfer(IERC20Token _to ...
•    - function safeTransferFrom(IERC20Token ...
• interface IOwned
•    - function owner()
•    - function transferOwnership(address _n ...
•    - function acceptOwnership()
•  contract Owned is IOwned
•    - function _ownerOnly()
•    - function transferOwnership(address _n ...
•    - function acceptOwnership()
•  contract Utils
•    - function _greaterThanZero(uint256 _va ...
•    - function _validAddress(address _addre ...
•    - function _notThis(address _address)
• interface IContractRegistry
•    - function addressOf(bytes32 _contractN ...
•  contract ContractRegistryClient is ...
•    - function _only(bytes32 _contractName)
•    - function updateRegistry()
•    - function restoreRegistry()
•    - function restrictRegistryUpdate(bool ...
•    - function addressOf(bytes32 _contractN ...
• interface ITokenHolder is IOwned
•    - function withdrawTokens(IERC20Token _ ...
• interface IConverterAnchor is IOwned, ...
• interface IWhitelist
•    - function isWhitelisted(address _addre ...
• interface IConverter is IOwned
•    - function converterType()
•    - function anchor()
•    - function isActive()
•    - function targetAmountAndFee(IERC20Tok ...
•    - function convert(IERC20Token _sourceT ...
•    - function conversionWhitelist()
•    - function conversionFee()
•    - function maxConversionFee()
•    - function reserveBalance(IERC20Token _ ...
•    - function transferAnchorOwnership(addr ...
•    - function acceptAnchorOwnership()
•    - function setConversionFee(uint32 _con ...
•    - function setConversionWhitelist(IWhit ...
•    - function withdrawTokens(IERC20Token _ ...
•    - function withdrawETH(address payable ...
•    - function addReserve(IERC20Token _toke ...
•    - function token()
•    - function transferTokenOwnership(addre ...
•    - function acceptTokenOwnership()
•    - function connectors(IERC20Token _addr ...
•    - function getConnectorBalance(IERC20To ...
•    - function connectorTokens(uint256 _ind ...
•    - function connectorTokenCount()
• interface ITypedConverterCustomFactor ...
•    - function converterType()
• interface IConverterFactory
•    - function createAnchor(uint16 _type, s ...
•    - function createConverter(uint16 _type ...
•    - function customFactories(uint16 _type ...
• interface IConverterRegistry
•    - function getAnchorCount()
•    - function getAnchors()
•    - function getAnchor(uint256 _index)
•    - function isAnchor(address _value)
•    - function getLiquidityPoolCount()
•    - function getLiquidityPools()
•    - function getLiquidityPool(uint256 _in ...
•    - function isLiquidityPool(address _val ...
•    - function getConvertibleTokenCount()
•    - function getConvertibleTokens()
•    - function getConvertibleToken(uint256 ...
•    - function isConvertibleToken(address _ ...
•    - function getConvertibleTokenAnchorCou ...
•    - function getConvertibleTokenAnchors(I ...
•    - function getConvertibleTokenAnchor(IE ...
•    - function isConvertibleTokenAnchor(IER ...
• interface IConverterRegistryData
•    - function addSmartToken(IConverterAnch ...
•    - function removeSmartToken(IConverterA ...
•    - function addLiquidityPool(IConverterA ...
•    - function removeLiquidityPool(IConvert ...
•    - function addConvertibleToken(IERC20To ...
•    - function removeConvertibleToken(IERC2 ...
•    - function getSmartTokenCount()
•    - function getSmartTokens()
•    - function getSmartToken(uint256 _index ...
•    - function isSmartToken(address _value)
•    - function getLiquidityPoolCount()
•    - function getLiquidityPools()
•    - function getLiquidityPool(uint256 _in ...
•    - function isLiquidityPool(address _val ...
•    - function getConvertibleTokenCount()
•    - function getConvertibleTokens()
•    - function getConvertibleToken(uint256 ...
•    - function isConvertibleToken(address _ ...
•    - function getConvertibleTokenSmartToke ...
•    - function getConvertibleTokenSmartToke ...
•    - function getConvertibleTokenSmartToke ...
•    - function isConvertibleTokenSmartToken ...
• interface ISmartToken is IConverterAn ...
•    - function disableTransfers(bool _disab ...
•    - function issue(address _to, uint256 _ ...
•    - function destroy(address _from, uint2 ...
•  contract ConverterRegistry is ICon ... *
•    - function newConverter(
•    - function addConverter(IConverter _con ...
•    - function removeConverter(IConverter _ ...
•    - function getAnchorCount()
•    - function getAnchors()
•    - function getAnchor(uint256 _index)
•    - function isAnchor(address _value)
•    - function getLiquidityPoolCount()
•    - function getLiquidityPools()
•    - function getLiquidityPool(uint256 _in ...
•    - function isLiquidityPool(address _val ...
•    - function getConvertibleTokenCount()
•    - function getConvertibleTokens()
•    - function getConvertibleToken(uint256 ...
•    - function isConvertibleToken(address _ ...
•    - function getConvertibleTokenAnchorCou ...
•    - function getConvertibleTokenAnchors(I ...
•    - function getConvertibleTokenAnchor(IE ...
•    - function isConvertibleTokenAnchor(IER ...
•    - function getConvertersByAnchors(addre ...
•    - function isConverterValid(IConverter ...
•    - function isSimilarLiquidityPoolRegist ...
•    - function getLiquidityPoolByConfig(uin ...
•    - function addAnchor(IConverterRegistry ...
•    - function removeAnchor(IConverterRegis ...
•    - function addLiquidityPool(IConverterR ...
•    - function removeLiquidityPool(IConvert ...
•    - function addConvertibleToken(IConvert ...
•    - function removeConvertibleToken(IConv ...
•    - function addConverterInternal(IConver ...
•    - function removeConverterInternal(ICon ...
•    - function getLeastFrequentTokenAnchors ...
•    - function isConverterReserveConfigEqua ...
•    - function getReserveWeight(IConverter ...
•    - function getConverterType(IConverter ...
•    - function getSmartTokenCount()
•    - function getSmartTokens()
•    - function getSmartToken(uint256 _index ...
•    - function isSmartToken(address _value)
•    - function getConvertibleTokenSmartToke ...
•    - function getConvertibleTokenSmartToke ...
•    - function getConvertibleTokenSmartToke ...
•    - function isConvertibleTokenSmartToken ...
•    - function getConvertersBySmartTokens(a ...
•    - function getLiquidityPoolByReserveCon ...

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/**
 *Submitted for verification at Etherscan.io on 2020-09-25
*/

// File: solidity/contracts/token/interfaces/IERC20Token.sol

// SPDX-License-Identifier: SEE LICENSE IN LICENSE
pragma solidity 0.6.12;

/*
    ERC20 Standard Token interface
*/
interface IERC20Token {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address _owner) external view returns (uint256);
    function allowance(address _owner, address _spender) external view returns (uint256);

    function transfer(address _to, uint256 _value) external returns (bool);
    function transferFrom(address _from, address _to, uint256 _value) external returns (bool);
    function approve(address _spender, uint256 _value) external returns (bool);
}

// File: solidity/contracts/utility/TokenHandler.sol


pragma solidity 0.6.12;


contract TokenHandler {
    bytes4 private constant APPROVE_FUNC_SELECTOR = bytes4(keccak256("approve(address,uint256)"));
    bytes4 private constant TRANSFER_FUNC_SELECTOR = bytes4(keccak256("transfer(address,uint256)"));
    bytes4 private constant TRANSFER_FROM_FUNC_SELECTOR = bytes4(keccak256("transferFrom(address,address,uint256)"));

    /**
      * @dev executes the ERC20 token's `approve` function and reverts upon failure
      * the main purpose of this function is to prevent a non standard ERC20 token
      * from failing silently
      *
      * @param _token   ERC20 token address
      * @param _spender approved address
      * @param _value   allowance amount
    */
    function safeApprove(IERC20Token _token, address _spender, uint256 _value) internal {
        (bool success, bytes memory data) = address(_token).call(abi.encodeWithSelector(APPROVE_FUNC_SELECTOR, _spender, _value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'ERR_APPROVE_FAILED');
    }

    /**
      * @dev executes the ERC20 token's `transfer` function and reverts upon failure
      * the main purpose of this function is to prevent a non standard ERC20 token
      * from failing silently
      *
      * @param _token   ERC20 token address
      * @param _to      target address
      * @param _value   transfer amount
    */
    function safeTransfer(IERC20Token _token, address _to, uint256 _value) internal {
       (bool success, bytes memory data) = address(_token).call(abi.encodeWithSelector(TRANSFER_FUNC_SELECTOR, _to, _value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'ERR_TRANSFER_FAILED');
    }

    /**
      * @dev executes the ERC20 token's `transferFrom` function and reverts upon failure
      * the main purpose of this function is to prevent a non standard ERC20 token
      * from failing silently
      *
      * @param _token   ERC20 token address
      * @param _from    source address
      * @param _to      target address
      * @param _value   transfer amount
    */
    function safeTransferFrom(IERC20Token _token, address _from, address _to, uint256 _value) internal {
       (bool success, bytes memory data) = address(_token).call(abi.encodeWithSelector(TRANSFER_FROM_FUNC_SELECTOR, _from, _to, _value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'ERR_TRANSFER_FROM_FAILED');
    }
}

// File: solidity/contracts/utility/interfaces/IOwned.sol


pragma solidity 0.6.12;

/*
    Owned contract interface
*/
interface IOwned {
    // this function isn't since the compiler emits automatically generated getter functions as external
    function owner() external view returns (address);

    function transferOwnership(address _newOwner) external;
    function acceptOwnership() external;
}

// File: solidity/contracts/utility/Owned.sol


pragma solidity 0.6.12;


/**
  * @dev Provides support and utilities for contract ownership
*/
contract Owned is IOwned {
    address public override owner;
    address public newOwner;

    /**
      * @dev triggered when the owner is updated
      *
      * @param _prevOwner previous owner
      * @param _newOwner  new owner
    */
    event OwnerUpdate(address indexed _prevOwner, address indexed _newOwner);

    /**
      * @dev initializes a new Owned instance
    */
    constructor() public {
        owner = msg.sender;
    }

    // allows execution by the owner only
    modifier ownerOnly {
        _ownerOnly();
        _;
    }

    // error message binary size optimization
    function _ownerOnly() internal view {
        require(msg.sender == owner, "ERR_ACCESS_DENIED");
    }

    /**
      * @dev allows transferring the contract ownership
      * the new owner still needs to accept the transfer
      * can only be called by the contract owner
      *
      * @param _newOwner    new contract owner
    */
    function transferOwnership(address _newOwner) public override ownerOnly {
        require(_newOwner != owner, "ERR_SAME_OWNER");
        newOwner = _newOwner;
    }

    /**
      * @dev used by a new owner to accept an ownership transfer
    */
    function acceptOwnership() override public {
        require(msg.sender == newOwner, "ERR_ACCESS_DENIED");
        emit OwnerUpdate(owner, newOwner);
        owner = newOwner;
        newOwner = address(0);
    }
}

// File: solidity/contracts/utility/Utils.sol


pragma solidity 0.6.12;

/**
  * @dev Utilities & Common Modifiers
*/
contract Utils {
    // verifies that a value is greater than zero
    modifier greaterThanZero(uint256 _value) {
        _greaterThanZero(_value);
        _;
    }

    // error message binary size optimization
    function _greaterThanZero(uint256 _value) internal pure {
        require(_value > 0, "ERR_ZERO_VALUE");
    }

    // validates an address - currently only checks that it isn't null
    modifier validAddress(address _address) {
        _validAddress(_address);
        _;
    }

    // error message binary size optimization
    function _validAddress(address _address) internal pure {
        require(_address != address(0), "ERR_INVALID_ADDRESS");
    }

    // verifies that the address is different than this contract address
    modifier notThis(address _address) {
        _notThis(_address);
        _;
    }

    // error message binary size optimization
    function _notThis(address _address) internal view {
        require(_address != address(this), "ERR_ADDRESS_IS_SELF");
    }
}

// File: solidity/contracts/utility/interfaces/IContractRegistry.sol


pragma solidity 0.6.12;

/*
    Contract Registry interface
*/
interface IContractRegistry {
    function addressOf(bytes32 _contractName) external view returns (address);
}

// File: solidity/contracts/utility/ContractRegistryClient.sol


pragma solidity 0.6.12;




/**
  * @dev Base contract for ContractRegistry clients
*/
contract ContractRegistryClient is Owned, Utils {
    bytes32 internal constant CONTRACT_REGISTRY = "ContractRegistry";
    bytes32 internal constant BANCOR_NETWORK = "BancorNetwork";
    bytes32 internal constant BANCOR_FORMULA = "BancorFormula";
    bytes32 internal constant CONVERTER_FACTORY = "ConverterFactory";
    bytes32 internal constant CONVERSION_PATH_FINDER = "ConversionPathFinder";
    bytes32 internal constant CONVERTER_UPGRADER = "BancorConverterUpgrader";
    bytes32 internal constant CONVERTER_REGISTRY = "BancorConverterRegistry";
    bytes32 internal constant CONVERTER_REGISTRY_DATA = "BancorConverterRegistryData";
    bytes32 internal constant BNT_TOKEN = "BNTToken";
    bytes32 internal constant BANCOR_X = "BancorX";
    bytes32 internal constant BANCOR_X_UPGRADER = "BancorXUpgrader";
    bytes32 internal constant CHAINLINK_ORACLE_WHITELIST = "ChainlinkOracleWhitelist";

    IContractRegistry public registry;      // address of the current contract-registry
    IContractRegistry public prevRegistry;  // address of the previous contract-registry
    bool public onlyOwnerCanUpdateRegistry; // only an owner can update the contract-registry

    /**
      * @dev verifies that the caller is mapped to the given contract name
      *
      * @param _contractName    contract name
    */
    modifier only(bytes32 _contractName) {
        _only(_contractName);
        _;
    }

    // error message binary size optimization
    function _only(bytes32 _contractName) internal view {
        require(msg.sender == addressOf(_contractName), "ERR_ACCESS_DENIED");
    }

    /**
      * @dev initializes a new ContractRegistryClient instance
      *
      * @param  _registry   address of a contract-registry contract
    */
    constructor(IContractRegistry _registry) internal validAddress(address(_registry)) {
        registry = IContractRegistry(_registry);
        prevRegistry = IContractRegistry(_registry);
    }

    /**
      * @dev updates to the new contract-registry
     */
    function updateRegistry() public {
        // verify that this function is permitted
        require(msg.sender == owner || !onlyOwnerCanUpdateRegistry, "ERR_ACCESS_DENIED");

        // get the new contract-registry
        IContractRegistry newRegistry = IContractRegistry(addressOf(CONTRACT_REGISTRY));

        // verify that the new contract-registry is different and not zero
        require(newRegistry != registry && address(newRegistry) != address(0), "ERR_INVALID_REGISTRY");

        // verify that the new contract-registry is pointing to a non-zero contract-registry
        require(newRegistry.addressOf(CONTRACT_REGISTRY) != address(0), "ERR_INVALID_REGISTRY");

        // save a backup of the current contract-registry before replacing it
        prevRegistry = registry;

        // replace the current contract-registry with the new contract-registry
        registry = newRegistry;
    }

    /**
      * @dev restores the previous contract-registry
    */
    function restoreRegistry() public ownerOnly {
        // restore the previous contract-registry
        registry = prevRegistry;
    }

    /**
      * @dev restricts the permission to update the contract-registry
      *
      * @param _onlyOwnerCanUpdateRegistry  indicates whether or not permission is restricted to owner only
    */
    function restrictRegistryUpdate(bool _onlyOwnerCanUpdateRegistry) public ownerOnly {
        // change the permission to update the contract-registry
        onlyOwnerCanUpdateRegistry = _onlyOwnerCanUpdateRegistry;
    }

    /**
      * @dev returns the address associated with the given contract name
      *
      * @param _contractName    contract name
      *
      * @return contract address
    */
    function addressOf(bytes32 _contractName) internal view returns (address) {
        return registry.addressOf(_contractName);
    }
}

// File: solidity/contracts/utility/interfaces/ITokenHolder.sol


pragma solidity 0.6.12;



/*
    Token Holder interface
*/
interface ITokenHolder is IOwned {
    function withdrawTokens(IERC20Token _token, address _to, uint256 _amount) external;
}

// File: solidity/contracts/converter/interfaces/IConverterAnchor.sol


pragma solidity 0.6.12;



/*
    Converter Anchor interface
*/
interface IConverterAnchor is IOwned, ITokenHolder {
}

// File: solidity/contracts/utility/interfaces/IWhitelist.sol


pragma solidity 0.6.12;

/*
    Whitelist interface
*/
interface IWhitelist {
    function isWhitelisted(address _address) external view returns (bool);
}

// File: solidity/contracts/converter/interfaces/IConverter.sol


pragma solidity 0.6.12;





/*
    Converter interface
*/
interface IConverter is IOwned {
    function converterType() external pure returns (uint16);
    function anchor() external view returns (IConverterAnchor);
    function isActive() external view returns (bool);

    function targetAmountAndFee(IERC20Token _sourceToken, IERC20Token _targetToken, uint256 _amount) external view returns (uint256, uint256);
    function convert(IERC20Token _sourceToken,
                     IERC20Token _targetToken,
                     uint256 _amount,
                     address _trader,
                     address payable _beneficiary) external payable returns (uint256);

    function conversionWhitelist() external view returns (IWhitelist);
    function conversionFee() external view returns (uint32);
    function maxConversionFee() external view returns (uint32);
    function reserveBalance(IERC20Token _reserveToken) external view returns (uint256);
    receive() external payable;

    function transferAnchorOwnership(address _newOwner) external;
    function acceptAnchorOwnership() external;
    function setConversionFee(uint32 _conversionFee) external;
    function setConversionWhitelist(IWhitelist _whitelist) external;
    function withdrawTokens(IERC20Token _token, address _to, uint256 _amount) external;
    function withdrawETH(address payable _to) external;
    function addReserve(IERC20Token _token, uint32 _ratio) external;

    // deprecated, backward compatibility
    function token() external view returns (IConverterAnchor);
    function transferTokenOwnership(address _newOwner) external;
    function acceptTokenOwnership() external;
    function connectors(IERC20Token _address) external view returns (uint256, uint32, bool, bool, bool);
    function getConnectorBalance(IERC20Token _connectorToken) external view returns (uint256);
    function connectorTokens(uint256 _index) external view returns (IERC20Token);
    function connectorTokenCount() external view returns (uint16);
}

// File: solidity/contracts/converter/interfaces/ITypedConverterCustomFactory.sol


pragma solidity 0.6.12;

/*
    Typed Converter Custom Factory interface
*/
interface ITypedConverterCustomFactory {
    function converterType() external pure returns (uint16);
}

// File: solidity/contracts/converter/interfaces/IConverterFactory.sol


pragma solidity 0.6.12;





/*
    Converter Factory interface
*/
interface IConverterFactory {
    function createAnchor(uint16 _type, string memory _name, string memory _symbol, uint8 _decimals) external returns (IConverterAnchor);
    function createConverter(uint16 _type, IConverterAnchor _anchor, IContractRegistry _registry, uint32 _maxConversionFee) external returns (IConverter);

    function customFactories(uint16 _type) external view returns (ITypedConverterCustomFactory);
}

// File: solidity/contracts/converter/interfaces/IConverterRegistry.sol


pragma solidity 0.6.12;


interface IConverterRegistry {
    function getAnchorCount() external view returns (uint256);
    function getAnchors() external view returns (address[] memory);
    function getAnchor(uint256 _index) external view returns (IConverterAnchor);
    function isAnchor(address _value) external view returns (bool);

    function getLiquidityPoolCount() external view returns (uint256);
    function getLiquidityPools() external view returns (address[] memory);
    function getLiquidityPool(uint256 _index) external view returns (IConverterAnchor);
    function isLiquidityPool(address _value) external view returns (bool);

    function getConvertibleTokenCount() external view returns (uint256);
    function getConvertibleTokens() external view returns (address[] memory);
    function getConvertibleToken(uint256 _index) external view returns (IERC20Token);
    function isConvertibleToken(address _value) external view returns (bool);

    function getConvertibleTokenAnchorCount(IERC20Token _convertibleToken) external view returns (uint256);
    function getConvertibleTokenAnchors(IERC20Token _convertibleToken) external view returns (address[] memory);
    function getConvertibleTokenAnchor(IERC20Token _convertibleToken, uint256 _index) external view returns (IConverterAnchor);
    function isConvertibleTokenAnchor(IERC20Token _convertibleToken, address _value) external view returns (bool);
}

// File: solidity/contracts/converter/interfaces/IConverterRegistryData.sol


pragma solidity 0.6.12;


interface IConverterRegistryData {
    function addSmartToken(IConverterAnchor _anchor) external;
    function removeSmartToken(IConverterAnchor _anchor) external;

    function addLiquidityPool(IConverterAnchor _liquidityPoolAnchor) external;
    function removeLiquidityPool(IConverterAnchor _liquidityPoolAnchor) external;

    function addConvertibleToken(IERC20Token _convertibleToken, IConverterAnchor _anchor) external;
    function removeConvertibleToken(IERC20Token _convertibleToken, IConverterAnchor _anchor) external;

    function getSmartTokenCount() external view returns (uint256);
    function getSmartTokens() external view returns (address[] memory);
    function getSmartToken(uint256 _index) external view returns (IConverterAnchor);
    function isSmartToken(address _value) external view returns (bool);

    function getLiquidityPoolCount() external view returns (uint256);
    function getLiquidityPools() external view returns (address[] memory);
    function getLiquidityPool(uint256 _index) external view returns (IConverterAnchor);
    function isLiquidityPool(address _value) external view returns (bool);

    function getConvertibleTokenCount() external view returns (uint256);
    function getConvertibleTokens() external view returns (address[] memory);
    function getConvertibleToken(uint256 _index) external view returns (IERC20Token);
    function isConvertibleToken(address _value) external view returns (bool);

    function getConvertibleTokenSmartTokenCount(IERC20Token _convertibleToken) external view returns (uint256);
    function getConvertibleTokenSmartTokens(IERC20Token _convertibleToken) external view returns (address[] memory);
    function getConvertibleTokenSmartToken(IERC20Token _convertibleToken, uint256 _index) external view returns (IConverterAnchor);
    function isConvertibleTokenSmartToken(IERC20Token _convertibleToken, address _value) external view returns (bool);
}

// File: solidity/contracts/token/interfaces/ISmartToken.sol


pragma solidity 0.6.12;




/*
    Smart Token interface
*/
interface ISmartToken is IConverterAnchor, IERC20Token {
    function disableTransfers(bool _disable) external;
    function issue(address _to, uint256 _amount) external;
    function destroy(address _from, uint256 _amount) external;
}

// File: solidity/contracts/converter/ConverterRegistry.sol


pragma solidity 0.6.12;








/**
  * @dev The ConverterRegistry maintains a list of all active converters in the Bancor Network.
  *
  * Since converters can be upgraded and thus their address can change, the registry actually keeps
  * converter anchors internally and not the converters themselves.
  * The active converter for each anchor can be easily accessed by querying the anchor's owner.
  *
  * The registry exposes 3 differnet lists that can be accessed and iterated, based on the use-case of the caller:
  * - Anchors - can be used to get all the latest / historical data in the network
  * - Liquidity pools - can be used to get all liquidity pools for funding, liquidation etc.
  * - Convertible tokens - can be used to get all tokens that can be converted in the network (excluding pool
  *   tokens), and for each one - all anchors that hold it in their reserves
  *
  *
  * The contract fires events whenever one of the primitives is added to or removed from the registry
  *
  * The contract is upgradable.
*/
contract ConverterRegistry is IConverterRegistry, ContractRegistryClient, TokenHandler {
    /**
      * @dev triggered when a converter anchor is added to the registry
      *
      * @param _anchor smart token
    */
    event ConverterAnchorAdded(IConverterAnchor indexed _anchor);

    /**
      * @dev triggered when a converter anchor is removed from the registry
      *
      * @param _anchor smart token
    */
    event ConverterAnchorRemoved(IConverterAnchor indexed _anchor);

    /**
      * @dev triggered when a liquidity pool is added to the registry
      *
      * @param _liquidityPool liquidity pool
    */
    event LiquidityPoolAdded(IConverterAnchor indexed _liquidityPool);

    /**
      * @dev triggered when a liquidity pool is removed from the registry
      *
      * @param _liquidityPool liquidity pool
    */
    event LiquidityPoolRemoved(IConverterAnchor indexed _liquidityPool);

    /**
      * @dev triggered when a convertible token is added to the registry
      *
      * @param _convertibleToken convertible token
      * @param _smartToken associated smart token
    */
    event ConvertibleTokenAdded(IERC20Token indexed _convertibleToken, IConverterAnchor indexed _smartToken);

    /**
      * @dev triggered when a convertible token is removed from the registry
      *
      * @param _convertibleToken convertible token
      * @param _smartToken associated smart token
    */
    event ConvertibleTokenRemoved(IERC20Token indexed _convertibleToken, IConverterAnchor indexed _smartToken);

    /**
      * @dev deprecated, backward compatibility, use `ConverterAnchorAdded`
    */
    event SmartTokenAdded(IConverterAnchor indexed _smartToken);

    /**
      * @dev deprecated, backward compatibility, use `ConverterAnchorRemoved`
    */
    event SmartTokenRemoved(IConverterAnchor indexed _smartToken);

    /**
      * @dev initializes a new ConverterRegistry instance
      *
      * @param _registry address of a contract registry contract
    */
    constructor(IContractRegistry _registry) ContractRegistryClient(_registry) public {
    }

    /**
      * @dev creates a zero supply liquid token / empty liquidity pool and adds its converter to the registry
      *
      * @param _type                converter type, see ConverterBase contract main doc
      * @param _name                token / pool name
      * @param _symbol              token / pool symbol
      * @param _decimals            token / pool decimals
      * @param _maxConversionFee    maximum conversion-fee
      * @param _reserveTokens       reserve tokens
      * @param _reserveWeights      reserve weights
      *
      * @return new converter
    */
    function newConverter(
        uint16 _type,
        string memory _name,
        string memory _symbol,
        uint8 _decimals,
        uint32 _maxConversionFee,
        IERC20Token[] memory _reserveTokens,
        uint32[] memory _reserveWeights
    )
    public virtual returns (IConverter)
    {
        uint256 length = _reserveTokens.length;
        require(length == _reserveWeights.length, "ERR_INVALID_RESERVES");
        require(getLiquidityPoolByConfig(_type, _reserveTokens, _reserveWeights) == IConverterAnchor(0), "ERR_ALREADY_EXISTS");

        IConverterFactory factory = IConverterFactory(addressOf(CONVERTER_FACTORY));
        IConverterAnchor anchor = IConverterAnchor(factory.createAnchor(_type, _name, _symbol, _decimals));
        IConverter converter = IConverter(factory.createConverter(_type, anchor, registry, _maxConversionFee));

        anchor.acceptOwnership();
        converter.acceptOwnership();

        for (uint256 i = 0; i < length; i++)
            converter.addReserve(_reserveTokens[i], _reserveWeights[i]);

        anchor.transferOwnership(address(converter));
        converter.acceptAnchorOwnership();
        converter.transferOwnership(msg.sender);

        addConverterInternal(converter);
        return converter;
    }

    /**
      * @dev adds an existing converter to the registry
      * can only be called by the owner
      *
      * @param _converter converter
    */
    function addConverter(IConverter _converter) public ownerOnly {
        require(isConverterValid(_converter), "ERR_INVALID_CONVERTER");
        addConverterInternal(_converter);
    }

    /**
      * @dev removes a converter from the registry
      * anyone can remove an existing converter from the registry, as long as the converter is invalid
      * note that the owner can also remove valid converters
      *
      * @param _converter converter
    */
    function removeConverter(IConverter _converter) public {
        require(msg.sender == owner || !isConverterValid(_converter), "ERR_ACCESS_DENIED");
        removeConverterInternal(_converter);
    }

    /**
      * @dev returns the number of converter anchors in the registry
      *
      * @return number of anchors
    */
    function getAnchorCount() public view override returns (uint256) {
        return IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA)).getSmartTokenCount();
    }

    /**
      * @dev returns the list of converter anchors in the registry
      *
      * @return list of anchors
    */
    function getAnchors() public view override returns (address[] memory) {
        return IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA)).getSmartTokens();
    }

    /**
      * @dev returns the converter anchor at a given index
      *
      * @param _index index
      * @return anchor at the given index
    */
    function getAnchor(uint256 _index) public view override returns (IConverterAnchor) {
        return IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA)).getSmartToken(_index);
    }

    /**
      * @dev checks whether or not a given value is a converter anchor
      *
      * @param _value value
      * @return true if the given value is an anchor, false if not
    */
    function isAnchor(address _value) public view override returns (bool) {
        return IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA)).isSmartToken(_value);
    }

    /**
      * @dev returns the number of liquidity pools in the registry
      *
      * @return number of liquidity pools
    */
    function getLiquidityPoolCount() public view override returns (uint256) {
        return IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA)).getLiquidityPoolCount();
    }

    /**
      * @dev returns the list of liquidity pools in the registry
      *
      * @return list of liquidity pools
    */
    function getLiquidityPools() public view override returns (address[] memory) {
        return IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA)).getLiquidityPools();
    }

    /**
      * @dev returns the liquidity pool at a given index
      *
      * @param _index index
      * @return liquidity pool at the given index
    */
    function getLiquidityPool(uint256 _index) public view override returns (IConverterAnchor) {
        return IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA)).getLiquidityPool(_index);
    }

    /**
      * @dev checks whether or not a given value is a liquidity pool
      *
      * @param _value value
      * @return true if the given value is a liquidity pool, false if not
    */
    function isLiquidityPool(address _value) public view override returns (bool) {
        return IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA)).isLiquidityPool(_value);
    }

    /**
      * @dev returns the number of convertible tokens in the registry
      *
      * @return number of convertible tokens
    */
    function getConvertibleTokenCount() public view override returns (uint256) {
        return IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA)).getConvertibleTokenCount();
    }

    /**
      * @dev returns the list of convertible tokens in the registry
      *
      * @return list of convertible tokens
    */
    function getConvertibleTokens() public view override returns (address[] memory) {
        return IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA)).getConvertibleTokens();
    }

    /**
      * @dev returns the convertible token at a given index
      *
      * @param _index index
      * @return convertible token at the given index
    */
    function getConvertibleToken(uint256 _index) public view override returns (IERC20Token) {
        return IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA)).getConvertibleToken(_index);
    }

    /**
      * @dev checks whether or not a given value is a convertible token
      *
      * @param _value value
      * @return true if the given value is a convertible token, false if not
    */
    function isConvertibleToken(address _value) public view override returns (bool) {
        return IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA)).isConvertibleToken(_value);
    }

    /**
      * @dev returns the number of converter anchors associated with a given convertible token
      *
      * @param _convertibleToken convertible token
      * @return number of anchors associated with the given convertible token
    */
    function getConvertibleTokenAnchorCount(IERC20Token _convertibleToken) public view override returns (uint256) {
        return IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA)).getConvertibleTokenSmartTokenCount(_convertibleToken);
    }

    /**
      * @dev returns the list of aoncerter anchors associated with a given convertible token
      *
      * @param _convertibleToken convertible token
      * @return list of anchors associated with the given convertible token
    */
    function getConvertibleTokenAnchors(IERC20Token _convertibleToken) public view override returns (address[] memory) {
        return IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA)).getConvertibleTokenSmartTokens(_convertibleToken);
    }

    /**
      * @dev returns the converter anchor associated with a given convertible token at a given index
      *
      * @param _index index
      * @return anchor associated with the given convertible token at the given index
    */
    function getConvertibleTokenAnchor(IERC20Token _convertibleToken, uint256 _index) public view override returns (IConverterAnchor) {
        return IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA)).getConvertibleTokenSmartToken(_convertibleToken, _index);
    }

    /**
      * @dev checks whether or not a given value is a converter anchor of a given convertible token
      *
      * @param _convertibleToken convertible token
      * @param _value value
      * @return true if the given value is an anchor of the given convertible token, false if not
    */
    function isConvertibleTokenAnchor(IERC20Token _convertibleToken, address _value) public view override returns (bool) {
        return IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA)).isConvertibleTokenSmartToken(_convertibleToken, _value);
    }

    /**
      * @dev returns a list of converters for a given list of anchors
      * this is a utility function that can be used to reduce the number of calls to the contract
      *
      * @param _anchors list of converter anchors
      * @return list of converters
    */
    function getConvertersByAnchors(address[] memory _anchors) public view returns (IConverter[] memory) {
        IConverter[] memory converters = new IConverter[](_anchors.length);

        for (uint256 i = 0; i < _anchors.length; i++)
            converters[i] = IConverter(payable(IConverterAnchor(_anchors[i]).owner()));

        return converters;
    }

    /**
      * @dev checks whether or not a given converter is valid
      *
      * @param _converter converter
      * @return true if the given converter is valid, false if not
    */
    function isConverterValid(IConverter _converter) public view returns (bool) {
        // verify that the converter is active
        return _converter.token().owner() == address(_converter);
    }

    /**
      * @dev checks if a liquidity pool with given configuration is already registered
      *
      * @param _converter converter with specific configuration
      * @return if a liquidity pool with the same configuration is already registered
    */
    function isSimilarLiquidityPoolRegistered(IConverter _converter) public view returns (bool) {
        uint256 reserveTokenCount = _converter.connectorTokenCount();
        IERC20Token[] memory reserveTokens = new IERC20Token[](reserveTokenCount);
        uint32[] memory reserveWeights = new uint32[](reserveTokenCount);

        // get the reserve-configuration of the converter
        for (uint256 i = 0; i < reserveTokenCount; i++) {
            IERC20Token reserveToken = _converter.connectorTokens(i);
            reserveTokens[i] = reserveToken;
            reserveWeights[i] = getReserveWeight(_converter, reserveToken);
        }

        // return if a liquidity pool with the same configuration is already registered
        return getLiquidityPoolByConfig(getConverterType(_converter, reserveTokenCount), reserveTokens, reserveWeights) != IConverterAnchor(0);
    }

    /**
      * @dev searches for a liquidity pool with specific configuration
      *
      * @param _type            converter type, see ConverterBase contract main doc
      * @param _reserveTokens   reserve tokens
      * @param _reserveWeights  reserve weights
      * @return the liquidity pool, or zero if no such liquidity pool exists
    */
    function getLiquidityPoolByConfig(uint16 _type, IERC20Token[] memory _reserveTokens, uint32[] memory _reserveWeights) public view returns (IConverterAnchor) {
        // verify that the input parameters represent a valid liquidity pool
        if (_reserveTokens.length == _reserveWeights.length && _reserveTokens.length > 1) {
            // get the anchors of the least frequent token (optimization)
            address[] memory convertibleTokenAnchors = getLeastFrequentTokenAnchors(_reserveTokens);
            // search for a converter with the same configuration
            for (uint256 i = 0; i < convertibleTokenAnchors.length; i++) {
                IConverterAnchor anchor = IConverterAnchor(convertibleTokenAnchors[i]);
                IConverter converter = IConverter(payable(anchor.owner()));
                if (isConverterReserveConfigEqual(converter, _type, _reserveTokens, _reserveWeights))
                    return anchor;
            }
        }

        return IConverterAnchor(0);
    }

    /**
      * @dev adds a converter anchor to the registry
      *
      * @param _anchor converter anchor
    */
    function addAnchor(IConverterRegistryData _converterRegistryData, IConverterAnchor _anchor) internal {
        _converterRegistryData.addSmartToken(_anchor);
        emit ConverterAnchorAdded(_anchor);
        emit SmartTokenAdded(_anchor);
    }

    /**
      * @dev removes a converter anchor from the registry
      *
      * @param _anchor converter anchor
    */
    function removeAnchor(IConverterRegistryData _converterRegistryData, IConverterAnchor _anchor) internal {
        _converterRegistryData.removeSmartToken(_anchor);
        emit ConverterAnchorRemoved(_anchor);
        emit SmartTokenRemoved(_anchor);
    }

    /**
      * @dev adds a liquidity pool to the registry
      *
      * @param _liquidityPoolAnchor liquidity pool converter anchor
    */
    function addLiquidityPool(IConverterRegistryData _converterRegistryData, IConverterAnchor _liquidityPoolAnchor) internal {
        _converterRegistryData.addLiquidityPool(_liquidityPoolAnchor);
        emit LiquidityPoolAdded(_liquidityPoolAnchor);
    }

    /**
      * @dev removes a liquidity pool from the registry
      *
      * @param _liquidityPoolAnchor liquidity pool converter anchor
    */
    function removeLiquidityPool(IConverterRegistryData _converterRegistryData, IConverterAnchor _liquidityPoolAnchor) internal {
        _converterRegistryData.removeLiquidityPool(_liquidityPoolAnchor);
        emit LiquidityPoolRemoved(_liquidityPoolAnchor);
    }

    /**
      * @dev adds a convertible token to the registry
      *
      * @param _convertibleToken    convertible token
      * @param _anchor              associated converter anchor
    */
    function addConvertibleToken(IConverterRegistryData _converterRegistryData, IERC20Token _convertibleToken, IConverterAnchor _anchor) internal {
        _converterRegistryData.addConvertibleToken(_convertibleToken, _anchor);
        emit ConvertibleTokenAdded(_convertibleToken, _anchor);
    }

    /**
      * @dev removes a convertible token from the registry
      *
      * @param _convertibleToken    convertible token
      * @param _anchor              associated converter anchor
    */
    function removeConvertibleToken(IConverterRegistryData _converterRegistryData, IERC20Token _convertibleToken, IConverterAnchor _anchor) internal {
        _converterRegistryData.removeConvertibleToken(_convertibleToken, _anchor);
        emit ConvertibleTokenRemoved(_convertibleToken, _anchor);
    }

    function addConverterInternal(IConverter _converter) private {
        IConverterRegistryData converterRegistryData = IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA));
        IConverterAnchor anchor = IConverter(_converter).token();
        uint256 reserveTokenCount = _converter.connectorTokenCount();

        // add the converter anchor
        addAnchor(converterRegistryData, anchor);
        if (reserveTokenCount > 1)
            addLiquidityPool(converterRegistryData, anchor);
        else
            addConvertibleToken(converterRegistryData, ISmartToken(address(anchor)), anchor);

        // add all reserve tokens
        for (uint256 i = 0; i < reserveTokenCount; i++)
            addConvertibleToken(converterRegistryData, _converter.connectorTokens(i), anchor);
    }

    function removeConverterInternal(IConverter _converter) private {
        IConverterRegistryData converterRegistryData = IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA));
        IConverterAnchor anchor = IConverter(_converter).token();
        uint256 reserveTokenCount = _converter.connectorTokenCount();

        // remove the converter anchor
        removeAnchor(converterRegistryData, anchor);
        if (reserveTokenCount > 1)
            removeLiquidityPool(converterRegistryData, anchor);
        else
            removeConvertibleToken(converterRegistryData, ISmartToken(address(anchor)), anchor);

        // remove all reserve tokens
        for (uint256 i = 0; i < reserveTokenCount; i++)
            removeConvertibleToken(converterRegistryData, _converter.connectorTokens(i), anchor);
    }

    function getLeastFrequentTokenAnchors(IERC20Token[] memory _reserveTokens) private view returns (address[] memory) {
        IConverterRegistryData converterRegistryData = IConverterRegistryData(addressOf(CONVERTER_REGISTRY_DATA));
        uint256 minAnchorCount = converterRegistryData.getConvertibleTokenSmartTokenCount(_reserveTokens[0]);
        uint256 index = 0;

        // find the reserve token which has the smallest number of converter anchors
        for (uint256 i = 1; i < _reserveTokens.length; i++) {
            uint256 convertibleTokenAnchorCount = converterRegistryData.getConvertibleTokenSmartTokenCount(_reserveTokens[i]);
            if (minAnchorCount > convertibleTokenAnchorCount) {
                minAnchorCount = convertibleTokenAnchorCount;
                index = i;
            }
        }

        return converterRegistryData.getConvertibleTokenSmartTokens(_reserveTokens[index]);
    }

    function isConverterReserveConfigEqual(IConverter _converter, uint16 _type, IERC20Token[] memory _reserveTokens, uint32[] memory _reserveWeights) private view returns (bool) {
        uint256 reserveTokenCount = _converter.connectorTokenCount();

        if (_type != getConverterType(_converter, reserveTokenCount))
            return false;

        if (_reserveTokens.length != reserveTokenCount)
            return false;

        for (uint256 i = 0; i < _reserveTokens.length; i++) {
            if (_reserveWeights[i] != getReserveWeight(_converter, _reserveTokens[i]))
                return false;
        }

        return true;
    }

    // utility to get the reserve weight (including from older converters that don't support the new getReserveWeight function)
    function getReserveWeight(IConverter _converter, IERC20Token _reserveToken) private view returns (uint32) {
        (, uint32 weight,,,) = _converter.connectors(_reserveToken);
        return weight;
    }

    bytes4 private constant CONVERTER_TYPE_FUNC_SELECTOR = bytes4(keccak256("converterType()"));

    // utility to get the converter type (including from older converters that don't support the new converterType function)
    function getConverterType(IConverter _converter, uint256 _reserveTokenCount) private view returns (uint16) {
        (bool success, bytes memory returnData) = address(_converter).staticcall(abi.encodeWithSelector(CONVERTER_TYPE_FUNC_SELECTOR));
        if (success && returnData.length == 32) 
            return abi.decode(returnData, (uint16));
        return _reserveTokenCount > 1 ? 1 : 0;
    }

    /**
      * @dev deprecated, backward compatibility, use `getAnchorCount`
    */
    function getSmartTokenCount() public view returns (uint256) {
        return getAnchorCount();
    }

    /**
      * @dev deprecated, backward compatibility, use `getAnchors`
    */
    function getSmartTokens() public view returns (address[] memory) {
        return getAnchors();
    }

    /**
      * @dev deprecated, backward compatibility, use `getAnchor`
    */
    function getSmartToken(uint256 _index) public view returns (IConverterAnchor) {
        return getAnchor(_index);
    }

    /**
      * @dev deprecated, backward compatibility, use `isAnchor`
    */
    function isSmartToken(address _value) public view returns (bool) {
        return isAnchor(_value);
    }

    /**
      * @dev deprecated, backward compatibility, use `getConvertibleTokenAnchorCount`
    */
    function getConvertibleTokenSmartTokenCount(IERC20Token _convertibleToken) public view returns (uint256) {
        return getConvertibleTokenAnchorCount(_convertibleToken);
    }

    /**
      * @dev deprecated, backward compatibility, use `getConvertibleTokenAnchors`
    */
    function getConvertibleTokenSmartTokens(IERC20Token _convertibleToken) public view returns (address[] memory) {
        return getConvertibleTokenAnchors(_convertibleToken);
    }

    /**
      * @dev deprecated, backward compatibility, use `getConvertibleTokenAnchor`
    */
    function getConvertibleTokenSmartToken(IERC20Token _convertibleToken, uint256 _index) public view returns (IConverterAnchor) {
        return getConvertibleTokenAnchor(_convertibleToken, _index);
    }

    /**
      * @dev deprecated, backward compatibility, use `isConvertibleTokenAnchor`
    */
    function isConvertibleTokenSmartToken(IERC20Token _convertibleToken, address _value) public view returns (bool) {
        return isConvertibleTokenAnchor(_convertibleToken, _value);
    }

    /**
      * @dev deprecated, backward compatibility, use `getConvertersByAnchors`
    */
    function getConvertersBySmartTokens(address[] memory _smartTokens) public view returns (IConverter[] memory) {
        return getConvertersByAnchors(_smartTokens);
    }

    /**
      * @dev deprecated, backward compatibility, use `getLiquidityPoolByConfig`
    */
    function getLiquidityPoolByReserveConfig(IERC20Token[] memory _reserveTokens, uint32[] memory _reserveWeights) public view returns (IConverterAnchor) {
        return getLiquidityPoolByConfig(_reserveTokens.length > 1 ? 1 : 0, _reserveTokens, _reserveWeights);
    }
}

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IConverter","name":"_converter","type":"address"}],"name":"isSimilarLiquidityPoolRegistered","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_value","type":"address"}],"name":"isSmartToken","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint16","name":"_type","type":"uint16"},{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"},{"internalType":"uint8","name":"_decimals","type":"uint8"},{"internalType":"uint32","name":"_maxConversionFee","type":"uint32"},{"internalType":"contract IERC20Token[]","name":"_reserveTokens","type":"address[]"},{"internalType":"uint32[]","name":"_reserveWeights","type":"uint32[]"}],"name":"newConverter","outputs":[{"internalType":"contract IConverter","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"newOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"onlyOwnerCanUpdateRegistry","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"prevRegistry","outputs":[{"internalType":"contract IContractRegistry","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"registry","outputs":[{"internalType":"contract IContractRegistry","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract 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00000000000000000000000052ae12abe5d8bd778bd5397f99ca900624cfadd4

-----Decoded View---------------
Arg [0] : _registry (address): 0x52Ae12ABe5D8BD778BD5397F99cA900624CfADD4

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000052ae12abe5d8bd778bd5397f99ca900624cfadd4