What is SPX max pain?
Max pain is the SPX settlement price where outstanding options buyers would receive the least aggregate intrinsic-value payout at expiration. For every possible settlement strike, the calculator totals the value of calls finishing in the money and puts finishing in the money, weighted by reported open interest.
The minimum point on the payout curve is called max pain. Traders watch it most closely near expiration because concentrated open interest can create hedging flows and pin risk around heavily populated strikes.
How this calculator works
- Select one SPX expiration from the delayed CBOE chain.
- Aggregate call and put open interest at every strike.
- Calculate intrinsic-value payout for every possible settlement strike using the standard 100× contract multiplier.
- Choose the strike with the lowest combined call and put payout.
How to use max pain responsibly
Max pain is not a target that SPX must reach. It is most useful as one positioning reference beside spot, gamma exposure, the call wall, put wall, and known catalysts. A small distance to max pain with concentrated open interest may support a pinning thesis; a strong trend or macro shock can invalidate it immediately.
Data and timing
The calculator uses CBOE’s delayed SPX chain. Open interest updates on a lag and does not reveal whether positions are long, short, hedged, or part of multi-leg spreads. The public endpoint refuses to return a modeled result when the real delayed chain is unavailable.
Learn more
- Max Pain Theory in Options: How It Works and Whether to Trust It — Understanding the max pain theory, how to calculate it, its track record, and practical ways to use it in your trading.
- Pin Risk and Options Expiration: Why Stocks Pin to Strikes — Understanding the mechanics of stock pinning at options expiration.
- Options Open Interest Explained: What It Is and Why It Matters — Understanding open interest in options markets, how it differs from volume, and how to use it for trading decisions.
- What is Gamma Exposure (GEX)? A Complete Guide — Understanding gamma exposure and how dealer hedging creates support and resistance levels in the market.