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Contains view functions to provide information about the pool that is computed rather than stored on the blockchain. The functions here may have variable gas costs.



  function observe(
uint32[] secondsAgos
) external view returns (int56[] tickCumulatives, uint160[] secondsPerLiquidityCumulativeX128s)

Returns the cumulative tick and liquidity as of each timestamp secondsAgo from the current block timestamp

To get a time weighted average tick or liquidity-in-range, you must call this with two values, one representing the beginning of the period and another for the end of the period. E.g., to get the last hour time-weighted average tick, you must call it with secondsAgos = [3600, 0]. The time weighted average tick represents the geometric time weighted average price of the pool, in log base sqrt(1.0001) of token1 / token0. The TickMath library can be used to go from a tick value to a ratio.


secondsAgosuint32[]From how long ago each cumulative tick and liquidity value should be returned

Return Values:

tickCumulativesint56[]Cumulative tick values as of each secondsAgos from the current block timestamp
secondsPerLiquidityCumulativeX128suint160[]Cumulative seconds per liquidity-in-range value as of each secondsAgos from the current block



  function snapshotCumulativesInside(
int24 tickLower,
int24 tickUpper
) external returns (int56 tickCumulativeInside, uint160 secondsPerLiquidityInsideX128, uint32 secondsInside)

Returns a snapshot of the tick cumulative, seconds per liquidity and seconds inside a tick range

Snapshots must only be compared to other snapshots, taken over a period for which a position existed. I.e., snapshots cannot be compared if a position is not held for the entire period between when the first snapshot is taken and the second snapshot is taken.


tickLowerint24The lower tick of the range
tickUpperint24The upper tick of the range

Return Values:

tickCumulativeInsideint56The snapshot of the tick accumulator for the range
secondsPerLiquidityInsideX128uint160The snapshot of seconds per liquidity for the range
secondsInsideuint32The snapshot of seconds per liquidity for the range