# Interfaces

**BFactory**

```
interface BFactory {

    function isBPool(address b) external view returns (bool);
    function newBPool() external returns (BPool);

}
```

**BPool**

```
interface BPool {

    function isPublicSwap() external view returns (bool);
    function isFinalized() external view returns (bool);
    function isBound(address t) external view returns (bool);
    function getNumTokens() external view returns (uint);
    function getCurrentTokens() external view returns (address[] memory tokens);
    function getFinalTokens() external view returns (address[] memory tokens);
    function getDenormalizedWeight(address token) external view returns (uint);
    function getTotalDenormalizedWeight() external view returns (uint);
    function getNormalizedWeight(address token) external view returns (uint);
    function getBalance(address token) external view returns (uint);
    function getSwapFee() external view returns (uint);
    function getController() external view returns (address);

    function setSwapFee(uint swapFee) external;
    function setController(address manager) external;
    function setPublicSwap(bool public_) external;
    function finalize() external;
    function bind(address token, uint balance, uint denorm) external;
    function rebind(address token, uint balance, uint denorm) public;
    function unbind(address token) external;
    function gulp(address token) external;

    function getSpotPrice(address tokenIn, address tokenOut) external view returns (uint spotPrice);
    function getSpotPriceSansFee(address tokenIn, address tokenOut) external view returns (uint spotPrice);

    function joinPool(uint poolAmountOut, uint[] calldata maxAmountsIn) external;   
    function exitPool(uint poolAmountIn, uint[] calldata minAmountsOut) external;

    function swapExactAmountIn(
        address tokenIn,
        uint tokenAmountIn,
        address tokenOut,
        uint minAmountOut,
        uint maxPrice
    ) external returns (uint tokenAmountOut, uint spotPriceAfter);

    function swapExactAmountOut(
        address tokenIn,
        uint maxAmountIn,
        address tokenOut,
        uint tokenAmountOut,
        uint maxPrice
    ) external returns (uint tokenAmountIn, uint spotPriceAfter);

    function joinswapExternAmountIn(
        address tokenIn,
        uint tokenAmountIn,
        uint minPoolAmountOut
    ) external returns (uint poolAmountOut);

    function joinswapPoolAmountOut(
        address tokenIn,
        uint poolAmountOut,
        uint maxAmountIn
    ) external returns (uint tokenAmountIn);

    function exitswapPoolAmountIn(
        address tokenOut,
        uint poolAmountIn,
        uint minAmountOut
    ) external returns (uint tokenAmountOut);

    function exitswapExternAmountOut(
        address tokenOut,
        uint tokenAmountOut,
        uint maxPoolAmountIn
    ) external returns (uint poolAmountIn);

    function totalSupply() external view returns (uint);
    function balanceOf(address whom) external view returns (uint);
    function allowance(address src, address dst) external view returns (uint);

    function approve(address dst, uint amt) external returns (bool);
    function transfer(address dst, uint amt) external returns (bool);
    function transferFrom(
        address src, address dst, uint amt
    ) external returns (bool);

    function calcSpotPrice(
        uint tokenBalanceIn,
        uint tokenWeightIn,
        uint tokenBalanceOut,
        uint tokenWeightOut,
        uint swapFee
    ) public pure returns (uint spotPrice);

    function calcOutGivenIn(
        uint tokenBalanceIn,
        uint tokenWeightIn,
        uint tokenBalanceOut,
        uint tokenWeightOut,
        uint tokenAmountIn,
        uint swapFee
    ) public pure returns (uint tokenAmountOut);

    function calcInGivenOut(
        uint tokenBalanceIn,
        uint tokenWeightIn,
        uint tokenBalanceOut,
        uint tokenWeightOut,
        uint tokenAmountOut,
        uint swapFee
    ) public pure returns (uint tokenAmountIn);

    function calcPoolOutGivenSingleIn(
        uint tokenBalanceIn,
        uint tokenWeightIn,
        uint poolSupply,
        uint totalWeight,
        uint tokenAmountIn,
        uint swapFee
    ) public pure returns (uint poolAmountOut);

    function calcSingleInGivenPoolOut(
        uint tokenBalanceIn,
        uint tokenWeightIn,
        uint poolSupply,
        uint totalWeight,
        uint poolAmountOut,
        uint swapFee
    ) public pure returns (uint tokenAmountIn)

    function calcSingleOutGivenPoolIn(
        uint tokenBalanceOut,
        uint tokenWeightOut,
        uint poolSupply,
        uint totalWeight,
        uint poolAmountIn,
        uint swapFee
    ) public pure returns (uint tokenAmountOut)

    function calcPoolInGivenSingleOut(
        uint tokenBalanceOut,
        uint tokenWeightOut,
        uint poolSupply,
        uint totalWeight,
        uint tokenAmountOut,
        uint swapFee
    ) public pure returns (uint poolAmountIn)

}
```

**Exchange Proxy**

```
interface ExchangeProxy {

    function batchSwapExactIn(
        Swap[] memory swaps,
        TokenInterface tokenIn,
        TokenInterface tokenOut,
        uint totalAmountIn,
        uint minTotalAmountOut
    )
        public payable
        returns (uint totalAmountOut);

    function batchSwapExactOut(
        Swap[] memory swaps,
        TokenInterface tokenIn,
        TokenInterface tokenOut,
        uint maxTotalAmountIn
    )
        public payable
        returns (uint totalAmountIn)

    function multihopBatchSwapExactIn(
        Swap[][] memory swapSequences,
        TokenInterface tokenIn,
        TokenInterface tokenOut,
        uint totalAmountIn,
        uint minTotalAmountOut
    )
        public payable
        returns (uint totalAmountOut)

    function multihopBatchSwapExactOut(
        Swap[][] memory swapSequences,
        TokenInterface tokenIn,
        TokenInterface tokenOut,
        uint maxTotalAmountIn
    )
        public payable
        returns (uint totalAmountIn)

    function smartSwapExactIn(
        TokenInterface tokenIn,
        TokenInterface tokenOut,
        uint totalAmountIn,
        uint minTotalAmountOut,
        uint nPools
    )
        public payable
        returns (uint totalAmountOut)

    function smartSwapExactOut(
        TokenInterface tokenIn,
        TokenInterface tokenOut,
        uint totalAmountOut,
        uint maxTotalAmountIn,
        uint nPools
    )
        public payable
        returns (uint totalAmountIn)

    function viewSplitExactIn(
        address tokenIn,
        address tokenOut,
        uint swapAmount,
        uint nPools
    )
        public view
        returns (Swap[] memory swaps, uint totalOutput)

    function viewSplitExactOut(
        address tokenIn,
        address tokenOut,
        uint swapAmount,
        uint nPools
    )
        public view
        returns (Swap[] memory swaps, uint totalOutput)
}
```


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