CurveRouterSwapper

Contains helper methods for interacting with Curve Router.

*Curve router is deployed on these networks at 0xF0d4c12A5768D806021F80a262B4d39d26C58b8D

Ethereum
Optimism
Gnosis
Polygon
Fantom
Kava
Arbitrum
Avalanche
Base at 0xd6681e74eEA20d196c15038C580f721EF2aB6320 https://github.com/curvefi/curve-router-ng/tree/master*

State Variables

_CURVE_ROUTER

The address of the Curve Router contract

address private immutable _CURVE_ROUTER;

Functions

constructor

Sets the Curve Router address on contract deployment.

constructor(address curveRouter_) payable;

Parameters

Name	Type	Description
`curveRouter_`	`address`	The address of the Curve Router.

_approveTokenForSwap

Approves the Curve Router to spend the specified token.

function _approveTokenForSwap(address token) internal;

Parameters

Name	Type	Description
`token`	`address`	The ERC20 token address to approve.

_swap

Executes a token swap via the Curve Router.

function _swap(
    CurveSwapParams memory curveSwapParams,
    uint256 amount,
    uint256 expected,
    address receiver
)
    internal
    returns (uint256);

Parameters

Name	Type	Description
`curveSwapParams`	`CurveSwapParams`	The parameters for the swap.
`amount`	`uint256`	The amount of the input token to swap.
`expected`	`uint256`	The minimum amount of the output token expected to receive.
`receiver`	`address`	The address that will receive the output tokens.

Returns

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

_validateSwapParams

Validates the swap parameters against the provided route and tokens.

function _validateSwapParams(
    CurveSwapParams memory curveSwapParams,
    address fromToken,
    address toToken
)
    internal
    view;

Parameters

Name	Type	Description
`curveSwapParams`	`CurveSwapParams`	The parameters for the swap.
`fromToken`	`address`	The address of the input token.
`toToken`	`address`	The address of the output token.

Structs

CurveSwapParams

Struct to store parameters for a Curve swap

struct CurveSwapParams {
    address[11] route;
    uint256[5][5] swapParams;
    address[5] pools;
}