Uniswap V3 Pool

Uniswap V3 stores price and liquidity state in slot0, which holds the current sqrtPriceX96, active tick, and observation pointer. Per-tick state tracks cumulative liquidity at each tick boundary, enabling concentrated liquidity ranges and efficient price discovery without iterating all positions.

Swaps move the active tick across liquidity boundaries, consuming liquidity from positions and updating slot0. Reading the Solidity implementation and event logs reveals how tick crossings trigger liquidity additions and removals, how fees accumulate, and how the pool state evolves between trades.

Minting adds liquidity between two ticks and updates per-tick state to track boundaries. Burning removes liquidity and calculates accrued fees proportional to swap volume at those ticks. Both operations emit events that validate state consistency and fee collection.

Observations record cumulative tick and liquidity data at each block, storing snapshots in slot0's observation array. Historical observations allow downstream contracts to compute time-weighted average prices (TWAP) without external price feeds.

Yes. Slot0 reveals the current price, active tick, and fee growth, while per-tick state shows liquidity boundaries and accrued fees. Cross-referencing event flows and state snapshots identifies liquidity gaps, price anomalies, and fee distribution errors.

Each fee tier (0.01%, 0.05%, 0.30%, 1%) defines a pool variant with a corresponding tick spacing. Smaller fee tiers use finer tick resolution, allowing more precise price ranges but increasing gas costs for liquidity management and tick crossings.