ICurveRouter

Functions

exchange

Performs an exchange operation.

route and swapParams should be determined off chain.

function exchange(
    address[11] calldata route,
    uint256[5][5] calldata swapParams,
    uint256 amount,
    uint256 expected
)
    external
    payable
    returns (uint256);

Parameters

Name	Type	Description
`route`	`address[11]`	An array of [initial token, pool or zap, token, pool or zap, token, ...]. The iteration continues until a pool address of 0x00, then the last given token is transferred to `_receiver`
`swapParams`	`uint256[5][5]`	A multidimensional array of [i, j, swap type, pool_type, n_coins] where: i is the index of the input token, j is the index of the output token, swap type should be: - 1 for `exchange`, - 2 for `exchange_underlying`, - 3 for underlying exchange via zap: factory stable metapools with lending base pool `exchange_underlying` and factory crypto-metapools underlying exchange (`exchange` method in zap); - 4 for coin -> LP token "exchange" (actually `add_liquidity`), - 5 for lending pool underlying coin -> LP token "exchange" (actually `add_liquidity`), - 6 for LP token -> coin "exchange" (actually `remove_liquidity_one_coin`), - 7 for LP token -> lending or fake pool underlying coin "exchange" (actually `remove_liquidity_one_coin`), - 8 for ETH <-> WETH, ETH -> stETH or ETH -> frxETH, stETH <-> wstETH, frxETH <-> sfrxETH, ETH -> wBETH, - 9 for SNX swaps (sUSD, sEUR, sETH, sBTC) Pool type: - 1 - stable, 2 - crypto, 3 - tricrypto, 4 - llama `n_coins` indicates the number of coins in the pool
`amount`	`uint256`	The amount of `route[0]` to be sent.
`expected`	`uint256`	The minimum amount received after the final swap.

Returns

Name	Type	Description
`<none>`	`uint256`	The received amount of the final output token.

exchange

Performs up to 5 swaps in a single transaction.

Routing and swap params must be determined off-chain. This functionality is designed for gas efficiency over ease-of-use.

function exchange(
    address[11] calldata route,
    uint256[5][5] calldata swapParams,
    uint256 amount,
    uint256 expected,
    address[5] calldata pools,
    address receiver
)
    external
    payable
    returns (uint256);

Parameters

Name	Type	Description
`route`	`address[11]`	Array of the route.
`swapParams`	`uint256[5][5]`	Parameters for the swap operation.
`amount`	`uint256`	The amount of `route[0]` to be sent.
`expected`	`uint256`	The minimum amount expected after all the swaps.
`pools`	`address[5]`	Array of pool addresses for swaps via zap contracts. Needed only for swap type = 3.
`receiver`	`address`	The address to transfer the final output token to.

Returns

Name	Type	Description
`<none>`	`uint256`	The received amount of the final output token.

exchange

Executes an exchange operation.

function exchange(
    address[11] calldata route,
    uint256[5][5] calldata swapParams,
    uint256 amount,
    uint256 expected,
    address[5] calldata pools
)
    external
    payable
    returns (uint256);

Parameters

Name	Type	Description
`route`	`address[11]`	Array containing the route for exchange.
`swapParams`	`uint256[5][5]`	Parameters for the swap operation.
`amount`	`uint256`	The amount of input token to be sent.
`expected`	`uint256`	The minimum amount expected after the exchange.
`pools`	`address[5]`	Array of pool addresses for swaps via zap contracts.

Returns

Name	Type	Description
`<none>`	`uint256`	The received amount of the final output token.

get_dy

function get_dy(
    address[11] calldata route,
    uint256[5][5] calldata swapParams,
    uint256 amount,
    address[5] calldata pools
)
    external
    view
    returns (uint256);