Router

Because routers are stateless and do not hold token balances, they can be replaced safely and trustlessly, if necessary. This may happen if more efficient smart contract patterns are discovered, or if additional functionality is desired.

Code

DragonswapRouter.sol

Read-Only Functions

factory​

function factory() external pure returns (address);

Returns factory address.

WSEI​

function WSEI() external pure returns (address);

Returns the canonical WSEI address on the SEI V2 mainnet.

quote​

See quote.

getAmountOut​

See getAmountOut.

getAmountIn​

See getAmountIn.

getAmountsOut​

function getAmountsOut(uint amountIn, address[] memory path) public view returns (uint[] memory amounts);

See getAmountsOut.

getAmountsIn​

function getAmountsIn(uint amountOut, address[] memory path) public view returns (uint[] memory amounts);

See getAmountsIn.

State-Changing Functions

addLiquidity​

function addLiquidity(
  address tokenA,
  address tokenB,
  uint amountADesired,
  uint amountBDesired,
  uint amountAMin,
  uint amountBMin,
  address to,
  uint deadline
) external returns (uint amountA, uint amountB, uint liquidity);

Adds liquidity to an ERC-20⇄ERC-20 pool.

• To cover all possible scenarios, msg.sender should have already given the router an allowance of at least amountADesired/amountBDesired on tokenA/tokenB.

• Always adds assets at the ideal ratio, according to the price when the transaction is executed.

• If a pool for the passed tokens does not exists, one is created automatically, and exactly amountADesired/amountBDesired tokens are added.

Name	Type
tokenA	address	A pool token.
tokenB	address	A pool token.
amountADesired	uint	The amount of tokenA to add as liquidity if the B/A price is <= amountBDesired/amountADesired (A depreciates).
amountBDesired	uint	The amount of tokenB to add as liquidity if the A/B price is <= amountADesired/amountBDesired (B depreciates).
amountAMin	uint	Bounds the extent to which the B/A price can go up before the transaction reverts. Must be <= amountADesired.
amountBMin	uint	Bounds the extent to which the A/B price can go up before the transaction reverts. Must be <= amountBDesired.
to	address	Recipient of the liquidity tokens.
deadline	uint	Unix timestamp after which the transaction will revert.
amountA	uint	The amount of tokenA sent to the pool.
amountB	uint	The amount of tokenB sent to the pool.
liquidity	uint	The amount of liquidity tokens minted.

addLiquiditySEI​

function addLiquiditySEI(
  address token,
  uint amountTokenDesired,
  uint amountTokenMin,
  uint amountSEIMin,
  address to,
  uint deadline
) external payable returns (uint amountToken, uint amountSEI, uint liquidity);

Adds liquidity to an ERC-20⇄WSEI pool with SEI.

• To cover all possible scenarios, msg.sender should have already given the router an allowance of at least amountTokenDesired on token.

• Always adds assets at the ideal ratio, according to the price when the transaction is executed.

• msg.value is treated as a amountSEIDesired.

• Leftover SEI, if any, is returned to msg.sender.

• If a pool for the passed token and WSEI does not exists, one is created automatically, and exactly amountTokenDesired/msg.value tokens are added.

Name	Type
token	address	A pool token.
amountTokenDesired	uint	The amount of token to add as liquidity if the WSEI/token price is <= msg.value/amountTokenDesired (token depreciates).
msg.value (amountSEIDesired)	uint	The amount of SEI to add as liquidity if the token/WSEI price is <= amountTokenDesired/msg.value (WSEI depreciates).
amountTokenMin	uint	Bounds the extent to which the WSEI/token price can go up before the transaction reverts. Must be <= amountTokenDesired.
amountSEIMin	uint	Bounds the extent to which the token/WSEI price can go up before the transaction reverts. Must be <= msg.value.
to	address	Recipient of the liquidity tokens.
deadline	uint	Unix timestamp after which the transaction will revert.
amountToken	uint	The amount of token sent to the pool.
amountSEI	uint	The amount of SEI converted to WSEI and sent to the pool.
liquidity	uint	The amount of liquidity tokens minted.

removeLiquidity​

function removeLiquidity(
  address tokenA,
  address tokenB,
  uint liquidity,
  uint amountAMin,
  uint amountBMin,
  address to,
  uint deadline
) external returns (uint amountA, uint amountB);

Removes liquidity from an ERC-20⇄ERC-20 pool.

• msg.sender should have already given the router an allowance of at least liquidity on the pool.

Name	Type
tokenA	address	A pool token.
tokenB	address	A pool token.
liquidity	uint	The amount of liquidity tokens to remove.
amountAMin	uint	The minimum amount of tokenA that must be received for the transaction not to revert.
amountBMin	uint	The minimum amount of tokenB that must be received for the transaction not to revert.
to	address	Recipient of the underlying assets.
deadline	uint	Unix timestamp after which the transaction will revert.
amountA	uint	The amount of tokenA received.
amountB	uint	The amount of tokenB received.

removeLiquiditySEI​

function removeLiquiditySEI(
  address token,
  uint liquidity,
  uint amountTokenMin,
  uint amountSEIMin,
  address to,
  uint deadline
) external returns (uint amountToken, uint amountSEI);

Removes liquidity from an ERC-20⇄WSEI pool and receive SEI.

• msg.sender should have already given the router an allowance of at least liquidity on the pool.

Name	Type
token	address	A pool token.
liquidity	uint	The amount of liquidity tokens to remove.
amountTokenMin	uint	The minimum amount of token that must be received for the transaction not to revert.
amountSEIMin	uint	The minimum amount of SEI that must be received for the transaction not to revert.
to	address	Recipient of the underlying assets.
deadline	uint	Unix timestamp after which the transaction will revert.
amountToken	uint	The amount of token received.
amountSEI	uint	The amount of SEI received.

removeLiquidityWithPermit​

function removeLiquidityWithPermit(
  address tokenA,
  address tokenB,
  uint liquidity,
  uint amountAMin,
  uint amountBMin,
  address to,
  uint deadline,
  bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountA, uint amountB);

Removes liquidity from an ERC-20⇄ERC-20 pool without pre-approval, thanks to permit.

Name	Type
tokenA	address	A pool token.
tokenB	address	A pool token.
liquidity	uint	The amount of liquidity tokens to remove.
amountAMin	uint	The minimum amount of tokenA that must be received for the transaction not to revert.
amountBMin	uint	The minimum amount of tokenB that must be received for the transaction not to revert.
to	address	Recipient of the underlying assets.
deadline	uint	Unix timestamp after which the transaction will revert.
approveMax	bool	Whether or not the approval amount in the signature is for liquidity or uint(-1).
v	uint8	The v component of the permit signature.
r	bytes32	The r component of the permit signature.
s	bytes32	The s component of the permit signature.
amountA	uint	The amount of tokenA received.
amountB	uint	The amount of tokenB received.

removeLiquiditySEIWithPermit​

function removeLiquiditySEIWithPermit(
  address token,
  uint liquidity,
  uint amountTokenMin,
  uint amountSEIMin,
  address to,
  uint deadline,
  bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountToken, uint amountSEI);

Removes liquidity from an ERC-20⇄WSEI pool and receive SEI without pre-approval, thanks to permit.

Name	Type
token	address	A pool token.
liquidity	uint	The amount of liquidity tokens to remove.
amountTokenMin	uint	The minimum amount of token that must be received for the transaction not to revert.
amountSEIMin	uint	The minimum amount of SEI that must be received for the transaction not to revert.
to	address	Recipient of the underlying assets.
deadline	uint	Unix timestamp after which the transaction will revert.
approveMax	bool	Whether or not the approval amount in the signature is for liquidity or uint(-1).
v	uint8	The v component of the permit signature.
r	bytes32	The r component of the permit signature.
s	bytes32	The s component of the permit signature.
amountToken	uint	The amount of token received.
amountSEI	uint	The amount of SEI received.

removeLiquiditySEISupportingFeeOnTransferTokens​

function removeLiquiditySEISupportingFeeOnTransferTokens(
  address token,
  uint liquidity,
  uint amountTokenMin,
  uint amountSEIMin,
  address to,
  uint deadline
) external returns (uint amountSEI);

Identical to removeLiquiditySEI, but succeeds for tokens that take a fee on transfer.

• msg.sender should have already given the router an allowance of at least liquidity on the pool.

Name	Type
token	address	A pool token.
liquidity	uint	The amount of liquidity tokens to remove.
amountTokenMin	uint	The minimum amount of token that must be received for the transaction not to revert.
amountSEIMin	uint	The minimum amount of SEI that must be received for the transaction not to revert.
to	address	Recipient of the underlying assets.
deadline	uint	Unix timestamp after which the transaction will revert.
amountSEI	uint	The amount of SEI received.

removeLiquiditySEIWithPermitSupportingFeeOnTransferTokens​

function removeLiquiditySEIWithPermitSupportingFeeOnTransferTokens(
  address token,
  uint liquidity,
  uint amountTokenMin,
  uint amountSEIMin,
  address to,
  uint deadline,
  bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountSEI);

Identical to removeLiquiditySEIWithPermit, but succeeds for tokens that take a fee on transfer.

Name	Type
token	address	A pool token.
liquidity	uint	The amount of liquidity tokens to remove.
amountTokenMin	uint	The minimum amount of token that must be received for the transaction not to revert.
amountSEIMin	uint	The minimum amount of SEI that must be received for the transaction not to revert.
to	address	Recipient of the underlying assets.
deadline	uint	Unix timestamp after which the transaction will revert.
approveMax	bool	Whether or not the approval amount in the signature is for liquidity or uint(-1).
v	uint8	The v component of the permit signature.
r	bytes32	The r component of the permit signature.
s	bytes32	The s component of the permit signature.
amountSEI	uint	The amount of SEI received.

swapExactTokensForTokens​

function swapExactTokensForTokens(
  uint amountIn,
  uint amountOutMin,
  address[] calldata path,
  address to,
  uint deadline
) external returns (uint[] memory amounts);

Swaps an exact amount of input tokens for as many output tokens as possible, along the route determined by the path. The first element of path is the input token, the last is the output token, and any intermediate elements represent intermediate pairs to trade through (if, for example, a direct pair does not exist).

• msg.sender should have already given the router an allowance of at least amountIn on the input token.

Name	Type
amountIn	uint	The amount of input tokens to send.
amountOutMin	uint	The minimum amount of output tokens that must be received for the transaction not to revert.
path	address[] calldata	An array of token addresses. path.length must be >= 2. Pools for each consecutive pair of addresses must exist and have liquidity.
to	address	Recipient of the output tokens.
deadline	uint	Unix timestamp after which the transaction will revert.
amounts	uint[] memory	The input token amount and all subsequent output token amounts.

swapTokensForExactTokens​

function swapTokensForExactTokens(
  uint amountOut,
  uint amountInMax,
  address[] calldata path,
  address to,
  uint deadline
) external returns (uint[] memory amounts);

Receive an exact amount of output tokens for as few input tokens as possible, along the route determined by the path. The first element of path is the input token, the last is the output token, and any intermediate elements represent intermediate tokens to trade through (if, for example, a direct pair does not exist).

• msg.sender should have already given the router an allowance of at least amountInMax on the input token.

Name	Type
amountOut	uint	The amount of output tokens to receive.
amountInMax	uint	The maximum amount of input tokens that can be required before the transaction reverts.
path	address[] calldata	An array of token addresses. path.length must be >= 2. Pools for each consecutive pair of addresses must exist and have liquidity.
to	address	Recipient of the output tokens.
deadline	uint	Unix timestamp after which the transaction will revert.
amounts	uint[] memory	The input token amount and all subsequent output token amounts.

swapExactSEIForTokens​

function swapExactSEIForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
  external
  payable
  returns (uint[] memory amounts);

Swaps an exact amount of SEI for as many output tokens as possible, along the route determined by the path. The first element of path must be WSEI, the last is the output token, and any intermediate elements represent intermediate pairs to trade through (if, for example, a direct pair does not exist).

Name	Type
msg.value (amountIn)	uint	The amount of SEI to send.
amountOutMin	uint	The minimum amount of output tokens that must be received for the transaction not to revert.
path	address[] calldata	An array of token addresses. path.length must be >= 2. Pools for each consecutive pair of addresses must exist and have liquidity.
to	address	Recipient of the output tokens.
deadline	uint	Unix timestamp after which the transaction will revert.
amounts	uint[] memory	The input token amount and all subsequent output token amounts.

swapTokensForExactSEI​

function swapTokensForExactSEI(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
  external
  returns (uint[] memory amounts);

Receive an exact amount of SEI for as few input tokens as possible, along the route determined by the path. The first element of path is the input token, the last must be WSEI, and any intermediate elements represent intermediate pairs to trade through (if, for example, a direct pair does not exist).

• msg.sender should have already given the router an allowance of at least amountInMax on the input token.

• If the to address is a smart contract, it must have the ability to receive SEI.

Name	Type
amountOut	uint	The amount of SEI to receive.
amountInMax	uint	The maximum amount of input tokens that can be required before the transaction reverts.
path	address[] calldata	An array of token addresses. path.length must be >= 2. Pools for each consecutive pair of addresses must exist and have liquidity.
to	address	Recipient of SEI.
deadline	uint	Unix timestamp after which the transaction will revert.
amounts	uint[] memory	The input token amount and all subsequent output token amounts.

swapExactTokensForSEI​

function swapExactTokensForSEI(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
  external
  returns (uint[] memory amounts);

Swaps an exact amount of tokens for as much SEI as possible, along the route determined by the path. The first element of path is the input token, the last must be WSEI, and any intermediate elements represent intermediate pairs to trade through (if, for example, a direct pair does not exist).

• If the to address is a smart contract, it must have the ability to receive SEI.

Name	Type
amountIn	uint	The amount of input tokens to send.
amountOutMin	uint	The minimum amount of output tokens that must be received for the transaction not to revert.
path	address[] calldata	An array of token addresses. path.length must be >= 2. Pools for each consecutive pair of addresses must exist and have liquidity.
to	address	Recipient of the SEI.
deadline	uint	Unix timestamp after which the transaction will revert.
amounts	uint[] memory	The input token amount and all subsequent output token amounts.

swapSEIForExactTokens​

function swapSEIForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
  external
  payable
  returns (uint[] memory amounts);

Receive an exact amount of tokens for as little SEIas possible, along the route determined by the path. The first element of path must be WETH, the last is the output token and any intermediate elements represent intermediate pairs to trade through (if, for example, a direct pair does not exist).

• Leftover SEI, if any, is returned to msg.sender.

Name	Type
amountOut	uint	The amount of tokens to receive.
msg.value (amountInMax)	uint	The maximum amount of SEI that can be required before the transaction reverts.
path	address[] calldata	An array of token addresses. path.length must be >= 2. Pools for each consecutive pair of addresses must exist and have liquidity.
to	address	Recipient of the output tokens.
deadline	uint	Unix timestamp after which the transaction will revert.
amounts	uint[] memory	The input token amount and all subsequent output token amounts.

swapExactTokensForTokensSupportingFeeOnTransferTokens​

function swapExactTokensForTokensSupportingFeeOnTransferTokens(
  uint amountIn,
  uint amountOutMin,
  address[] calldata path,
  address to,
  uint deadline
) external;

Identical to swapExactTokensForTokens, but succeeds for tokens that take a fee on transfer.

• msg.sender should have already given the router an allowance of at least amountIn on the input token.

Name	Type
amountIn	uint	The amount of input tokens to send.
amountOutMin	uint	The minimum amount of output tokens that must be received for the transaction not to revert.
path	address[] calldata	An array of token addresses. path.length must be >= 2. Pools for each consecutive pair of addresses must exist and have liquidity.
to	address	Recipient of the output tokens.
deadline	uint	Unix timestamp after which the transaction will revert.

swapExactSEIForTokensSupportingFeeOnTransferTokens​

function swapExactSEIForTokensSupportingFeeOnTransferTokens(
  uint amountOutMin,
  address[] calldata path,
  address to,
  uint deadline
) external payable;

Identical to swapExactSEIForTokens, but succeeds for tokens that take a fee on transfer.

Name	Type
msg.value (amountIn)	uint	The amount of SEI to send.
amountOutMin	uint	The minimum amount of output tokens that must be received for the transaction not to revert.
path	address[] calldata	An array of token addresses. path.length must be >= 2. Pools for each consecutive pair of addresses must exist and have liquidity.
to	address	Recipient of the output tokens.
deadline	uint	Unix timestamp after which the transaction will revert.

swapExactTokensForSEISupportingFeeOnTransferTokens​

function swapExactTokensForSEISupportingFeeOnTransferTokens(
  uint amountIn,
  uint amountOutMin,
  address[] calldata path,
  address to,
  uint deadline
) external;

Identical to swapExactTokensForSEI, but succeeds for tokens that take a fee on transfer.

• If the to address is a smart contract, it must have the ability to receive SEI.

Name	Type
amountIn	uint	The amount of input tokens to send.
amountOutMin	uint	The minimum amount of output tokens that must be received for the transaction not to revert.
path	address[] calldata	An array of token addresses. path.length must be >= 2. Pools for each consecutive pair of addresses must exist and have liquidity.
to	address	Recipient of the SEI.
deadline	uint	Unix timestamp after which the transaction will revert.

Interface

pragma solidity >=0.6.2;

interface IDragonswapRouter {
    function factory() external pure returns (address);
    function WSEI() external pure returns (address);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquiditySEI(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountSEIMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountSEI, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquiditySEI(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountSEIMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountSEI);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquiditySEIWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountSEIMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountSEI);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactSEIForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactSEI(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForSEI(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapSEIForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function removeLiquiditySEISupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountSEIMin,
        address to,
        uint deadline
    ) external returns (uint amountSEI);
    function removeLiquiditySEIWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountSEIMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountSEI);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactSEIForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForSEISupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

ABI

https://github.com/dragonswap-app/dragonswap-core/blob/7daf58214605f2bcbb2b06d295acc1d891437fc7/deployments/abis.json#L3