# IAlgebraPoolEvents Events emitted by a pool *Developer note: Credit to Uniswap Labs under GPL-2.0-or-later license: * ## Events ### Initialize `event Initialize(uint160 price, int24 tick)` Emitted exactly once by a pool when #initialize is first called on the pool *Developer note: Mint/Burn/Swap cannot be emitted by the pool before Initialize* | Name | Type | Description | | ----- | ------- | ------------------------------------------------------------------------------------ | | price | uint160 | The initial sqrt price of the pool, as a Q64.96 | | tick | int24 | The initial tick of the pool, i.e. log base 1.0001 of the starting price of the pool | ### Mint `event Mint(address sender, address owner, int24 bottomTick, int24 topTick, uint128 liquidityAmount, uint256 amount0, uint256 amount1)` Emitted when liquidity is minted for a given position *Developer note: If the top and bottom ticks match, this should be treated as a limit order* | Name | Type | Description | | --------------- | ------- | --------------------------------------------------------------- | | sender | address | The address that minted the liquidity | | owner | address | The owner of the position and recipient of any minted liquidity | | bottomTick | int24 | The lower tick of the position | | topTick | int24 | The upper tick of the position | | liquidityAmount | uint128 | The amount of liquidity minted to the position range | | amount0 | uint256 | How much token0 was required for the minted liquidity | | amount1 | uint256 | How much token1 was required for the minted liquidity | ### Collect `event Collect(address owner, address recipient, int24 bottomTick, int24 topTick, uint128 amount0, uint128 amount1)` Emitted when fees are collected by the owner of a position *Developer note: Collect events may be emitted with zero amount0 and amount1 when the caller chooses not to collect fees* | Name | Type | Description | | ---------- | ------- | ------------------------------------------------------ | | owner | address | The owner of the position for which fees are collected | | recipient | address | The address that received fees | | bottomTick | int24 | The lower tick of the position | | topTick | int24 | The upper tick of the position | | amount0 | uint128 | The amount of token0 fees collected | | amount1 | uint128 | The amount of token1 fees collected | ### Burn `event Burn(address owner, int24 bottomTick, int24 topTick, uint128 liquidityAmount, uint256 amount0, uint256 amount1)` Emitted when a position's liquidity is removed *Developer note: Does not withdraw any fees earned by the liquidity position, which must be withdrawn via #collect* | Name | Type | Description | | --------------- | ------- | -------------------------------------------------------- | | owner | address | The owner of the position for which liquidity is removed | | bottomTick | int24 | The lower tick of the position | | topTick | int24 | The upper tick of the position | | liquidityAmount | uint128 | The amount of liquidity to remove | | amount0 | uint256 | The amount of token0 withdrawn | | amount1 | uint256 | The amount of token1 withdrawn | ### Swap `event Swap(address sender, address recipient, int256 amount0, int256 amount1, uint160 price, uint128 liquidity, int24 tick)` Emitted by the pool for any swaps between token0 and token1 | Name | Type | Description | | --------- | ------- | ------------------------------------------------------------------------ | | sender | address | The address that initiated the swap call, and that received the callback | | recipient | address | The address that received the output of the swap | | amount0 | int256 | The delta of the token0 balance of the pool | | amount1 | int256 | The delta of the token1 balance of the pool | | price | uint160 | The sqrt(price) of the pool after the swap, as a Q64.96 | | liquidity | uint128 | The liquidity of the pool after the swap | | tick | int24 | The log base 1.0001 of price of the pool after the swap | ### Flash `event Flash(address sender, address recipient, uint256 amount0, uint256 amount1, uint256 paid0, uint256 paid1)` Emitted by the pool for any flashes of token0/token1 | Name | Type | Description | | --------- | ------- | ---------------------------------------------------------------------------------- | | sender | address | The address that initiated the swap call, and that received the callback | | recipient | address | The address that received the tokens from flash | | amount0 | uint256 | The amount of token0 that was flashed | | amount1 | uint256 | The amount of token1 that was flashed | | paid0 | uint256 | The amount of token0 paid for the flash, which can exceed the amount0 plus the fee | | paid1 | uint256 | The amount of token1 paid for the flash, which can exceed the amount1 plus the fee | ### CommunityFee `event CommunityFee(uint8 communityFeeNew)` Emitted when the community fee is changed by the pool | Name | Type | Description | | --------------- | ----- | ------------------------------------------------------------ | | communityFeeNew | uint8 | The updated value of the community fee in thousandths (1e-3) | ### TickSpacing `event TickSpacing(int24 newTickSpacing, int24 newTickSpacingLimitOrders)` Emitted when the tick spacing changes | Name | Type | Description | | ------------------------- | ----- | ---------------------------------------------------------- | | newTickSpacing | int24 | The updated value of the new tick spacing | | newTickSpacingLimitOrders | int24 | The updated value of the new tick spacing for limit orders | ### Incentive `event Incentive(address newIncentiveAddress)` Emitted when new activeIncentive is set | Name | Type | Description | | ------------------- | ------- | -------------------------------- | | newIncentiveAddress | address | The address of the new incentive | ### Fee `event Fee(uint16 feeZtO, uint16 feeOtZ)` Emitted when the fee changes inside the pool | Name | Type | Description | | ------ | ------ | --------------------------------------------------------------- | | feeZtO | uint16 | The current fee for ZtO swaps in hundredths of a bip, i.e. 1e-6 | | feeOtZ | uint16 | The current fee for OtZ swaps in hundredths of a bip, i.e. 1e-6 | ### DataStorageFailure `event DataStorageFailure()` Emitted in case of an error when trying to write to the DataStorage *Developer note: This shouldn't happen*