Curve Finance

The following functions are optimized to swap on Curve using as little gas as possible.

curveExactInputSingle

Swap exactly amountIn of tokenIn for tokenOut on Curve using pool.

For determining which kind number to use, see the interface source-code. To use underlying swap, set underlying to true.

The token indexes are determined by the order of the tokens in the pool. For example, if the pool is DAI/USDC/USDT, then tokenIndexIn for DAI is 0, tokenIndexIn for USDC is 1, and tokenIndexIn for USDT is 2.

See Conventions for common fields.

See Curve docs for more on these fields.

struct ExactInputSingleParams {
  uint256 amountIn;
  uint256 amountOut;
  address recipient;
  address pool;
  uint16 feeBps;
  uint16 slippageBps;
  address partner;
  address tokenIn;
  address tokenOut;
  uint48 deadline;
  uint8 tokenIndexIn;
  uint8 tokenIndexOut;
  uint8 kind;
  bool underlying;
}

function curveExactInputSingle(
  ExactInputSingleParams memory params,
  PermitParams calldata permit
) external payable returns (uint256 amountOut);

function curveExactInputSinglePermit(
  ExactInputSingleParams memory params,
  PermitParams calldata permit
) external payable returns (uint256 amountOut);