What Max Pain measures
Max Pain is the strike where the total value of every outstanding option — calls and puts, weighted by open interest — expiring worthless is maximized. It marks where option sellers collectively lose the least and buyers collectively lose the most.
It is not a guarantee, but it is a real magnet when open interest concentrates heavily around it and no strong directional catalyst is pulling the other way. Unlike the gamma flip and the walls, which describe dealer hedging mechanics, Max Pain describes option writers' incentive — a related but genuinely different force acting on the same strikes.
The pain curve
Plotting total option value-at-expiry across every strike produces the pain curve; its minimum is Max Pain.
The curve's steepness tells you how strong the pull actually is — a sharp, narrow shape means a small number of strikes dominate open interest, a strong magnet. A flat, wide curve means open interest is spread thin, a weak magnet easily overridden by news or a trending tape.
Alignment, and two different ratios
Dealer Alignment checks whether Max Pain and the gamma structure — the flip and the walls — agree on direction. When they converge, the pin reads with higher confidence. When they diverge, expect chop: dealer hedging flow and option-writer incentive are pulling price in different directions at once.
Put/call open interest ratio and put/call volume ratio sound similar but answer different questions. The open interest ratio reflects held positioning — standing hedges and long-term bets — and changes slowly. The volume ratio reflects today's flow and can spike intraday. A high open interest ratio next to a normal volume ratio usually means old hedges sitting quietly, not fresh fear; a spike in the volume ratio against flat open interest usually means a same-day scramble that may or may not stick. Both effects run strongest in the final session or two before expiration.