Pool Utilization

V2 has two distinct utilization concepts: token borrowing from a CollateralTracker and liquidity removal from an AMM chunk. Do not use one as a substitute for the other.

Collateral-vault utilization

Use getPoolData() on each CollateralTracker for its accounted pool balances and utilization. The contract includes asset and credit accounting in its utilization calculation. A bare ERC-20 balance or the ratio of buyer count to seller count is not equivalent.

Vault utilization affects borrow rates, collateral ratios, and cross-token collateral support. Always read both tokens at a common block.

Chunk utilization

Options buyers remove liquidity from a chunk supplied by sellers. The position manager tracks removed and remaining liquidity for streamia (streaming premium) accounting. MAX_SPREAD constrains their ratio; its raw scale and observed value are on the parameter page.

A caller's per-position spread limit can be tighter than the protocol limit. Available chunk liquidity and collateral-vault liquidity are separate execution constraints.

References: CollateralTracker, v3 SFPM, and v4 SFPM.