presenceoperations.com

What it would cost to execute a given notional in a given market right now: size-weighted fill price, slippage from the touch in basis points, and whether the visible book can absorb the size at all.

A liquidity-risk profile of a perpetual market, walked from the visible book: absorbable notional at four slippage tolerances on both sides, spread, book imbalance, top-of-book concentration, open interest and day volume — with the visible book's limits stated on every response rather than implied.

What it costs to hold a perpetual position: the venue's current hourly funding signed for your side, projected over your horizon in your own units, with the mark-to-oracle basis, open interest, and the assumption behind the projection stated rather than implied.