IV Surface · 8 min read

Skew and Term Structure: The Early-Warning Dimensions

Absolute levels tell you the state; changes tell you the news. Skew steepening and front-end term inversion are two of the most-watched early-warning signatures in options.

Skew as a flow gauge

Put skew measures how much the market pays up for downside protection relative to at-the-money. The informative object is usually the change: ΔSkew over 5 minutes, 30 minutes, a day. Spot can sit still while downside puts get bid — institutional hedgers moving before price does. The options market leading the stock market is not a metaphor; it is a measurable channel.

PutSkew = IV(25Δ put) − IV(ATM); slope = ∂IV/∂K, curvature = ∂²IV/∂K²
Skew and its derivatives along the strike axis. Models consume the change vector across multiple horizons, not just the level.

Term structure regimes

In calm markets the IV term structure sits in contango: front-month IV below back-month, uncertainty priced to arrive slowly. Stress flattens the curve and then inverts the front end — the market paying more for movement now than movement later. Encoding the whole curve (1D through 365D) preserves the regime transitions; compressing it to a single flag like 'VIX above 20' discards most of the information.

Term structure also interacts with the calendar: known events (CPI, FOMC, earnings) create bumps in the forward variance curve at their dates. A model that sees the full curve learns to separate scheduled uncertainty from the unscheduled kind — which is exactly the distinction that matters for positioning ahead of events.

In our pipeline

The production IV forecaster on this site predicts both next-day ATM IV and next-day 10Δ skew per symbol, and the anomaly score is computed on the full surface embedding — so a skew print that is unusual for the symbol's own history raises the score even when the ATM level looks ordinary. The forecast history (last five days) is shown per symbol on the Signals page so you can see the model's recent path against what happened.

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Educational content only. Nothing here is financial advice. Options involve substantial risk of loss.